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Pancolart
Joined: 04 Feb 2008 Posts: 3705 Location: Slovenia, EU
Expire: 2013-11-18
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Posted: Wed Mar 30, 2011 2:59 pm Post subject: Flektogon 2.4/35mm question |
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Pancolart wrote:
Does it matter how last element is turned? Or is is the same on both sides? I really can't tell the difference by just looking at it. On photo bellow it seems little different.
_________________ ---------------------------------
The Peculiar Apparatus Of Victorian Steampunk Photography: 100+ Genuine Steampunk Camera Designs https://www.amazon.com/dp/B0B92829NS |
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calvin83
Joined: 12 Apr 2009 Posts: 7557 Location: Hong Kong
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Posted: Wed Mar 30, 2011 4:24 pm Post subject: Re: Flektogon 2.4/35mm question |
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calvin83 wrote:
Pancolart wrote: |
Does it matter how last element is turned? Or is is the same on both sides? I really can't tell the difference by just looking at it. On photo bellow it seems little different.
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Shine rear element with a lamp or torch. If you have reversed the rear element, there will be two sepertation reflections instead of one.
Or
Just put all things together. If the rear element is reverved, you will see there is a image circle(not sure this is the right term) in the centre. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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Pancolart
Joined: 04 Feb 2008 Posts: 3705 Location: Slovenia, EU
Expire: 2013-11-18
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Posted: Wed Mar 30, 2011 9:17 pm Post subject: |
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Pancolart wrote:
I tried mounting both ways, but couldn't see much difference. It seems one way sharpness is better but only in center, if turned sharpness gets kind of worse but more to the edges. Could you elaborate this lamp / torch test? You mean 1 last piece of glass will produce 2 reflections? Or last three put together?
Lens seems nice and clean but sharpness isn't optimal. Last element was my first logical suspicion.
I really appreciate your help. _________________ ---------------------------------
The Peculiar Apparatus Of Victorian Steampunk Photography: 100+ Genuine Steampunk Camera Designs https://www.amazon.com/dp/B0B92829NS |
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calvin83
Joined: 12 Apr 2009 Posts: 7557 Location: Hong Kong
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Posted: Thu Mar 31, 2011 5:12 am Post subject: |
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calvin83 wrote:
Pancolart wrote: |
I tried mounting both ways, but couldn't see much difference. It seems one way sharpness is better but only in center, if turned sharpness gets kind of worse but more to the edges. Could you elaborate this lamp / torch test? You mean 1 last piece of glass will produce 2 reflections? Or last three put together?
Lens seems nice and clean but sharpness isn't optimal. Last element was my first logical suspicion.
I really appreciate your help. |
The number of reflections depends on the number of elements(the glued elements is count as one elements). For example, a cooke triplet will have six reflections(each side of a single elements will reflect one image). A Tessar have a four elements(one glued elements) so the total number of reflections is remind six.
From the diagram, the last two rear elements should be touch each other in the centre if it is assembly correctly. You should see the reflection by the rear side of the first rear element and the front side of the second rear element is vvery close to each other if you place the last element correctly. If you revere the last element, the seperation of the two reflections should be bigger.
If the above does not work, a good magnifying glass should help you to tell the difference. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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CarbonR
Joined: 31 Dec 2008 Posts: 1969 Location: Clermont-Ferrand, France
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Posted: Thu Mar 31, 2011 5:32 am Post subject: |
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CarbonR wrote:
In fact, any glass/air or glass/glass interface makes a reflexion (any one ith different refractive index). So a lens element makes 2 reflexions, a cemented doublet makes 3 reflexions, a cemented triplet makes 4 reflexions _________________ Cameras : Canon 5D, Pentax K100D, Pentax 6x7, Spotmatic
Lenses : 15mm to 1000mm (24x36)
My websites : [FR & ENG]Takumar - the eyes of the Spotmatic : info about all Takumar lenses // Kogaku - My photo site
I am selling : Takumar lenses and rare Pentax bodies, pm me if you're interested in something [MFLenses feed-back]
Information on Takumar lenses with samples :
Wide angle : Takumar 15/3.5 15mm, Takumar 17/4 17mm, Takumar 18/11 18mm, Takumar 20/4.5 20mm, Takumar 24/3.5 24mm, Takumar 28/3.5 V1 28mm, Takumar 28/3.5 V2 28mm, Takumar 35/2 V1 35mm, Takumar 35/2 V2 35mm, Takumar 35/2.3 35mm, Takumar 35/3.5 35mm, Takumar 35/4 35mm
Standard : Takumar 50/1.4 V1 50mm, Takumar 50/1.4 V2 50mm, Takumar 50/3.5 50mm, Takumar 50/4 50mm, Takumar 55/2 55/1.8 55mm, Takumar 55/2.2 V1 55mm, Takumar 55/2.2 V2 55mm, Takumar 58/2 58mm, Takumar 58/2.4 58mm
Short tele : Takumar 83/1.9 83mm, Takumar 85/1.8 85/1.9 85mm, Takumar 85/1.8 85mm, Takumar 100/2 100mm, Takumar 100/3.5 100mm, Takumar 100/4 100mm, Takumar 105/2.8 V1 105mm, Takumar 105/2.8 V2 105mm, Takumar 120/2.8 120mm
Telephoto : Takumar 135/2.5 V1 135mm, Takumar 135/2.5 V2 135mm, Takumar 135/3.5 V1 135mm, Takumar 135/3.5 V2 135mm, Takumar 150/4 V1 150mm, Takumar 150/4 V2 150mm
Long tele : Takumar 200/3.5 200mm, Takumar 200/4 200mm, Takumar 200/5.6 200mm, Takumar 300/4 V1 300mm, Takumar 300/4 V2 300mm, Takumar 300/4 V3 300mm, Takumar 300/6.3 300mm, Takumar 400/5.6 400mm, Takumar 500/4.5 500mm, Takumar 500/5 500mm, Takumar 1000/8 V1 1000mm, Takumar 1000/8 V2 1000mm
Zoom : Zoom-Takumar 45~125/4 , Zoom-Takumar 70~150/4.5 , Zoom-Takumar 85~210/4.5 , Zoom-Takumar 135~600/6.7
Achromatic : Ultra-Achromatic-Takumar 85/4.5 , Ultra-Achromatic-Takumar 300/5.6 300mm |
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calvin83
Joined: 12 Apr 2009 Posts: 7557 Location: Hong Kong
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Posted: Thu Mar 31, 2011 6:16 am Post subject: |
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calvin83 wrote:
CarbonR wrote: |
In fact, any glass/air or glass/glass interface makes a reflexion (any one ith different refractive index). So a lens element makes 2 reflexions, a cemented doublet makes 3 reflexions, a cemented triplet makes 4 reflexions |
You are right. I should add/change something:
There will be dim reflection at the cemented surface and bright reflection at the airspace.
e.g.
a cemented doublet makes 3 reflexions = two bright, one dim
cemented triplet makes 4 reflexions = two bright, two dim
Update:
I think the good sharpness in center indicates the right assembly. Some flek are little bit soft on the corners. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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Pancolart
Joined: 04 Feb 2008 Posts: 3705 Location: Slovenia, EU
Expire: 2013-11-18
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Posted: Fri Apr 01, 2011 10:07 am Post subject: |
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Pancolart wrote:
Thank you both for help. In fact the most problematic happened to be inside the lens front elements 3x screw adjustment (similar to Pentacon 1.8/50mm rear part adjustment+holder). It really can make Flekto produce shabby results if not centered and leveled correctly. _________________ ---------------------------------
The Peculiar Apparatus Of Victorian Steampunk Photography: 100+ Genuine Steampunk Camera Designs https://www.amazon.com/dp/B0B92829NS |
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calvin83
Joined: 12 Apr 2009 Posts: 7557 Location: Hong Kong
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Posted: Fri Apr 01, 2011 3:41 pm Post subject: |
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calvin83 wrote:
Pancolart wrote: |
Thank you both for help. In fact the most problematic happened to be inside the lens front elements 3x screw adjustment (similar to Pentacon 1.8/50mm rear part adjustment+holder). It really can make Flekto produce shabby results if not centered and leveled correctly. |
The Meyer Domiplan has a similar rear element design. A laser collimator may be used to align it? _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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nyoszi
Joined: 13 Sep 2011 Posts: 10 Location: Hungary
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Posted: Fri Sep 23, 2011 2:43 pm Post subject: |
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nyoszi wrote:
Hello, I just got a Flektogon 35/2.4 and it had problems with sharpness (towards the edges), I flipped the rear element, got slightly better results, but still far from optimal. Do you guys think I have to open it and look for those 3 screws to level it?
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nyoszi
Joined: 13 Sep 2011 Posts: 10 Location: Hungary
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Posted: Fri Sep 23, 2011 2:45 pm Post subject: |
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nyoszi wrote:
Seems like if the subject is closer than the sharp plane, the blur is a bit horizontal, and if its further, its a bit vertical.
I'd appreciate any help!
Thanks |
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Pancolart
Joined: 04 Feb 2008 Posts: 3705 Location: Slovenia, EU
Expire: 2013-11-18
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Posted: Sun Sep 25, 2011 10:01 am Post subject: |
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Pancolart wrote:
Pretty bad situation. Well try first from the front with those screws and keep us informed what happens. _________________ ---------------------------------
The Peculiar Apparatus Of Victorian Steampunk Photography: 100+ Genuine Steampunk Camera Designs https://www.amazon.com/dp/B0B92829NS |
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BRunner
Joined: 29 Jul 2009 Posts: 705 Location: Czech Republic
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Posted: Sun Sep 25, 2011 10:32 am Post subject: |
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BRunner wrote:
The front group is clearly decentered. Put you camera on tripod, enable liveview and try to center it right. It's laborious process, but with some patience it can be done. _________________ .: APO-Maniac :. |
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Excalibur
Joined: 19 Jul 2009 Posts: 5017 Location: UK
Expire: 2014-04-21
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Posted: Sat Oct 29, 2011 1:36 pm Post subject: |
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Excalibur wrote:
I've just bought a mint flektogon 35mm f2.4 MC and the blades are stuck...tried banging the lens stopped down with my hand and they only moved slightly, so how do I get to the blades please _________________ Canon A1, AV1, T70 & T90, EOS 300 and EOS300v, Chinon CE and CP-7M. Contax 139, Fuji STX-2, Konica Autoreflex TC, FS-1, FT-1, Minolta X-700, X-300, XD-11, SRT101b, Nikon EM, FM, F4, F90X, Olympus OM2, Pentax S3, Spotmatic, Pentax ME super, Praktica TL 5B, & BC1, , Ricoh KR10super, Yashica T5D, Bronica Etrs, Mamiya RB67 pro AND drum roll:- a Sony Nex 3
.........past gear Tele Rolleiflex and Rollei SL66.
Many lenses from good to excellent. |
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estudleon
Joined: 15 May 2008 Posts: 3754 Location: Argentina
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Posted: Sat Oct 29, 2011 2:05 pm Post subject: |
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estudleon wrote:
Pancolar. If your copy has the same coated than mine, the blue reflection is outer face.
And the internal is a bit more plane face. But only a bit. It isn't a simetrical element.
Good luck
Rino _________________ Konica 2,8/100
CZJ: 4/20, 2,4/35, 1,8/50 aus jena, 3,5/135MC, Pentacon 1,8/50
Pentax S-M-C-1,4/50
Helios 44-3
Mamiya 2,8/135
Misc. : jupiter 9
Stuff used:
A) SRL
Alpa 10 D - kern macro Switar 1,9/50 -black, Kilffit apochromat 2/100.
Asahi pentax spotmatic super takumar 1,4/50
Contaflex super B tessar 2,8/50 Pro-tessar 115
Leica R3 electronic summicron 2/50 elmarit 2,8/35
Konica Autoreflex 3 (2 black and chrome one), TC, T4. 2,8/24, 3,5/28 not MC and MC, 1,8/40, 1,4/50, 1,7/50 MC and not MC, 1,8/85, 3,2/135, 3,5/135, 4/200
Minolta XG9 2,8/35, 2/45, 3,5/135
Nikkormat FTn 1,4/50, 2,8/135
Fujica ST 801, 605, 705n. 3,5/19, 1,4/50, 1,8/55, 4/85, 3,5/135.
Praktica MTL 5 and a lot of M42 lenses.
Voigtlander. Bessamatic m, bessamatix de luxe, bessamatic cs, ultramatic and ultramatic cs.
Skoparex 3,5/35, skopagon 2/40, skopar 2,8/50, skopar X 2,8/50, super lanthar (out of catalogue) 2,8/50, dinarex 3,4/90, dinarex 4,8/100, super dinarex 4/135, super dinarex 4/200, zoomar 2,8/36-83, portrait lens 0, 1 and 2. Curtagon 4/28 and 2,8/35
Canon AV1, 1,8/50
Rolleiflex SL35 and SL35 E. 2,8/35 angulon, 2,8/35 distagon, 1,4/55 rolleinar, 1,8/50 planar, 4/135 tessar, 2,8/135 rolleinar, x2 rollei, M42 to rollei adap.
Etc.
RF
Yashica Minister III
Voightlander Vito, vitomatic I, Vito C, etc.
Leica M. M2, M3 (d.s.) and M4. Schenider 3,4/21, 2/35 summaron 2,8/35 (with eyes). Summicron 2/35 (8 elements with eyes), 2/35 chrome, 2/35 black, 1,4/35 pre asph and aspheric - old -, 2/40 summicron, 2,8/50 elmar, 2/50 7 elements, 2/50 DR, 2/50 - minolta version, 1,4/50 summilux 1966 version, 1,4/75 summilux, 2/90 large version, 2/90 reduced version of 1987, 2,8/90 elmarit large version, 4/135 elmar. |
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estudleon
Joined: 15 May 2008 Posts: 3754 Location: Argentina
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Posted: Sat Oct 29, 2011 2:20 pm Post subject: |
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estudleon wrote:
Excalibur.
In my opinion they aren't good news for you.
The problem of the problems with the flek are the blades and the diaphragm system.
You can arrive to the blades removing the frontal and the rear groups of elements. Please, if you decide to open the plastic container of the blades, be very careful. It has two springs and it is complicated to assemble again
My experience with that lens was terrorific. Good lens, but......... _________________ Konica 2,8/100
CZJ: 4/20, 2,4/35, 1,8/50 aus jena, 3,5/135MC, Pentacon 1,8/50
Pentax S-M-C-1,4/50
Helios 44-3
Mamiya 2,8/135
Misc. : jupiter 9
Stuff used:
A) SRL
Alpa 10 D - kern macro Switar 1,9/50 -black, Kilffit apochromat 2/100.
Asahi pentax spotmatic super takumar 1,4/50
Contaflex super B tessar 2,8/50 Pro-tessar 115
Leica R3 electronic summicron 2/50 elmarit 2,8/35
Konica Autoreflex 3 (2 black and chrome one), TC, T4. 2,8/24, 3,5/28 not MC and MC, 1,8/40, 1,4/50, 1,7/50 MC and not MC, 1,8/85, 3,2/135, 3,5/135, 4/200
Minolta XG9 2,8/35, 2/45, 3,5/135
Nikkormat FTn 1,4/50, 2,8/135
Fujica ST 801, 605, 705n. 3,5/19, 1,4/50, 1,8/55, 4/85, 3,5/135.
Praktica MTL 5 and a lot of M42 lenses.
Voigtlander. Bessamatic m, bessamatix de luxe, bessamatic cs, ultramatic and ultramatic cs.
Skoparex 3,5/35, skopagon 2/40, skopar 2,8/50, skopar X 2,8/50, super lanthar (out of catalogue) 2,8/50, dinarex 3,4/90, dinarex 4,8/100, super dinarex 4/135, super dinarex 4/200, zoomar 2,8/36-83, portrait lens 0, 1 and 2. Curtagon 4/28 and 2,8/35
Canon AV1, 1,8/50
Rolleiflex SL35 and SL35 E. 2,8/35 angulon, 2,8/35 distagon, 1,4/55 rolleinar, 1,8/50 planar, 4/135 tessar, 2,8/135 rolleinar, x2 rollei, M42 to rollei adap.
Etc.
RF
Yashica Minister III
Voightlander Vito, vitomatic I, Vito C, etc.
Leica M. M2, M3 (d.s.) and M4. Schenider 3,4/21, 2/35 summaron 2,8/35 (with eyes). Summicron 2/35 (8 elements with eyes), 2/35 chrome, 2/35 black, 1,4/35 pre asph and aspheric - old -, 2/40 summicron, 2,8/50 elmar, 2/50 7 elements, 2/50 DR, 2/50 - minolta version, 1,4/50 summilux 1966 version, 1,4/75 summilux, 2/90 large version, 2/90 reduced version of 1987, 2,8/90 elmarit large version, 4/135 elmar. |
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Excalibur
Joined: 19 Jul 2009 Posts: 5017 Location: UK
Expire: 2014-04-21
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Posted: Sat Oct 29, 2011 5:33 pm Post subject: |
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Excalibur wrote:
estudleon wrote: |
Excalibur.
In my opinion they aren't good news for you.
The problem of the problems with the flek are the blades and the diaphragm system.
You can arrive to the blades removing the frontal and the rear groups of elements. Please, if you decide to open the plastic container of the blades, be very careful. It has two springs and it is complicated to assemble again
My experience with that lens was terrorific. Good lens, but......... |
Thanks...but all might not be lost as with a bit of hitting with my hand I managed to get the Iris down to roughly F4 (comparing exposure readings with my other 35mm lenses) so I'll just use it at that. _________________ Canon A1, AV1, T70 & T90, EOS 300 and EOS300v, Chinon CE and CP-7M. Contax 139, Fuji STX-2, Konica Autoreflex TC, FS-1, FT-1, Minolta X-700, X-300, XD-11, SRT101b, Nikon EM, FM, F4, F90X, Olympus OM2, Pentax S3, Spotmatic, Pentax ME super, Praktica TL 5B, & BC1, , Ricoh KR10super, Yashica T5D, Bronica Etrs, Mamiya RB67 pro AND drum roll:- a Sony Nex 3
.........past gear Tele Rolleiflex and Rollei SL66.
Many lenses from good to excellent. |
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Excalibur
Joined: 19 Jul 2009 Posts: 5017 Location: UK
Expire: 2014-04-21
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Posted: Sun Oct 30, 2011 1:03 pm Post subject: |
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Excalibur wrote:
Excalibur wrote: |
estudleon wrote: |
Excalibur.
In my opinion they aren't good news for you.
The problem of the problems with the flek are the blades and the diaphragm system.
You can arrive to the blades removing the frontal and the rear groups of elements. Please, if you decide to open the plastic container of the blades, be very careful. It has two springs and it is complicated to assemble again
My experience with that lens was terrorific. Good lens, but......... |
Thanks...but all might not be lost as with a bit of hitting with my hand I managed to get the Iris down to roughly F4 (comparing exposure readings with my other 35mm lenses) so I'll just use it at that. |
Update:- for the Praktica flek if you are lucky and the iris is not to sticky, all you have to do is undo 3 screws to take the mount off then you'll see a place to put a few drops of lighter fluid and you will also see a little swivel lever that will operate the blades.... my flek needs to be stripped down for cleaning as it's too gummed up so in the meantime I've set it to f5.6 on "M" switch for general use......erm probably never will strip it down completely as I don't want any problems in trying to put it all back again _________________ Canon A1, AV1, T70 & T90, EOS 300 and EOS300v, Chinon CE and CP-7M. Contax 139, Fuji STX-2, Konica Autoreflex TC, FS-1, FT-1, Minolta X-700, X-300, XD-11, SRT101b, Nikon EM, FM, F4, F90X, Olympus OM2, Pentax S3, Spotmatic, Pentax ME super, Praktica TL 5B, & BC1, , Ricoh KR10super, Yashica T5D, Bronica Etrs, Mamiya RB67 pro AND drum roll:- a Sony Nex 3
.........past gear Tele Rolleiflex and Rollei SL66.
Many lenses from good to excellent.
Last edited by Excalibur on Sat Nov 26, 2011 10:04 am; edited 3 times in total |
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nyoszi
Joined: 13 Sep 2011 Posts: 10 Location: Hungary
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Posted: Wed Nov 09, 2011 12:55 pm Post subject: |
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nyoszi wrote:
BRunner wrote: |
The front group is clearly decentered. Put you camera on tripod, enable liveview and try to center it right. It's laborious process, but with some patience it can be done. |
Thank you for the help! But I gave it up. I feel like I cannot do it precise enough, just do trials, because in liveview mode I cannot fix the 3 screws. Is anyone interested in buying it as it is now? The center of the image is great, maybe it takes only 30 min for a pro to fix it. And I'll look for another one on the market. |
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Excalibur
Joined: 19 Jul 2009 Posts: 5017 Location: UK
Expire: 2014-04-21
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Posted: Sat Nov 26, 2011 10:05 am Post subject: |
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Excalibur wrote:
Excalibur wrote: |
Excalibur wrote: |
estudleon wrote: |
Excalibur.
In my opinion they aren't good news for you.
The problem of the problems with the flek are the blades and the diaphragm system.
You can arrive to the blades removing the frontal and the rear groups of elements. Please, if you decide to open the plastic container of the blades, be very careful. It has two springs and it is complicated to assemble again
My experience with that lens was terrorific. Good lens, but......... |
Thanks...but all might not be lost as with a bit of hitting with my hand I managed to get the Iris down to roughly F4 (comparing exposure readings with my other 35mm lenses) so I'll just use it at that. |
Update:- for the Praktica flek if you are lucky and the iris is not to sticky, all you have to do is undo 3 screws to take the mount off then you'll see a place to put a few drops of lighter fluid and you will also see a little swivel lever that will operate the blades.... my flek needs to be stripped down for cleaning as it's too gummed up so in the meantime I've set it to f5.6 on "M" switch for general use......erm probably never will strip it down completely as I don't want any problems in trying to put it all back again |
Latest Update: Having the lens stuck at f5.6 was very inconvenient for focussing and have everything looking dim in the viewfinder. So I spent hours applying lighter fuel (in tiny drops) then operating the Iris and finally it seems to be working ok...but the real test would be leaving it for a few days.
I'm having luck lately as the iris on my Kiron zoom is not sticking any more after about year, and after 2 years the exposure diodes on my Konica FT1 have started to work for the first time _________________ Canon A1, AV1, T70 & T90, EOS 300 and EOS300v, Chinon CE and CP-7M. Contax 139, Fuji STX-2, Konica Autoreflex TC, FS-1, FT-1, Minolta X-700, X-300, XD-11, SRT101b, Nikon EM, FM, F4, F90X, Olympus OM2, Pentax S3, Spotmatic, Pentax ME super, Praktica TL 5B, & BC1, , Ricoh KR10super, Yashica T5D, Bronica Etrs, Mamiya RB67 pro AND drum roll:- a Sony Nex 3
.........past gear Tele Rolleiflex and Rollei SL66.
Many lenses from good to excellent. |
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smallrewards
Joined: 19 Feb 2012 Posts: 4
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Posted: Sun Feb 19, 2012 6:47 pm Post subject: Flek 2.4...hey guys, another questionon lens direction |
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smallrewards wrote:
Not sure why pics arent working, will check it out when I get home.
Hey, well, for the first time ever I broke down an old manual lenses...just got into photography in December really...and I couldnt find a good set of directions for the breakdown on the 2.4-16 model.
Anyway, I justwent at it, unstuck my aperture, did a little other damage, got it fixed, set the infinity...then I went back and cleaned my lenses.
It was like 3 am, turned out the dust I saw was actually on my sensor (rocket blower in the mail) and I THINK that I replaced all the lens elements correctly. Most of them had a slightly darker ring on the top, and I identified the direction I recalled seeing that, and it seemed to fit better. So, I think it was ok, except for that one specific lens mentioned earlier in this post. I have no idea, and I tried to maintain focus on left vs right, but...i was tired and impatient. Another day I may break it open and check using that reflection based method mentioend earlier, but I thought the professionals sharing earlier in this thread might be able to look at some quick snapshots I took and determine if I should be concerned or not.
First some real world, then some of a sharpness chart...
on reviewing my setup again I am not 100% sure that DOF did not play a role. I tried to remove it, but, I am not sure I was successful so will work to create a more reliable setup to test sharpness. It is certainly softer at the edges wide open, but real world tests show it to not be nearly as significant as was indicated by my initial testing.
#7
#8
#9
#10
There is also a lot of dust on my sensor, showing up in some of these, which is probably making things softer than they would be. But, hopefully somebody can help me determine if my lens may be turned incorrectly or seems to be done correctly! Sorry for the numberof photos, wasnt sure how else to do this!
Last edited by smallrewards on Mon Feb 20, 2012 2:35 am; edited 1 time in total |
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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Sun Feb 19, 2012 8:17 pm Post subject: Re: Flek 2.4...hey guys, another questionon lens direction |
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Attila wrote:
smallrewards wrote: |
Not sure why pics arent working, will check it out when I get home.
Hey, well, for the first time ever I broke down an old manual lenses...just got into photography in December really...and I couldnt find a good set of directions for the breakdown on the 2.4-16 model.
Anyway, I justwent at it, unstuck my aperture, did a little other damage, got it fixed, set the infinity...then I went back and cleaned my lenses.
It was like 3 am, turned out the dust I saw was actually on my sensor (rocket blower in the mail) and I THINK that I replaced all the lens elements correctly. Most of them had a slightly darker ring on the top, and I identified the direction I recalled seeing that, and it seemed to fit better. So, I think it was ok, except for that one specific lens mentioned earlier in this post. I have no idea, and I tried to maintain focus on left vs right, but...i was tired and impatient. Another day I may break it open and check using that reflection based method mentioend earlier, but I thought the professionals sharing earlier in this thread might be able to look at some quick snapshots I took and determine if I should be concerned or not.
First some real world, then some of a sharpness chart...
f2.4 very soft on edges, but sharpens up later.
f2.8
f4
f5.6
f8
f11
#7
#8
#9
#10
There is also a lot of dust on my sensor, showing up in some of these, which is probably making things softer than they would be. But, hopefully somebody can help me determine if my lens may be turned incorrectly or seems to be done correctly! Sorry for the numberof photos, wasnt sure how else to do this! |
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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smallrewards
Joined: 19 Feb 2012 Posts: 4
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Posted: Mon Feb 20, 2012 12:04 am Post subject: |
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smallrewards wrote:
After reviewing my own pictures more carefully, I am beginning to feel that a lens element may be slightly off to the right? The left side is not just soft, but is blurry, even at f4, where as the right off to the edge is quite sharp even wide open.
Potential problem, I also was unable to unscrew the very front element, I think I did once (not 100% sure atually) but wasnt able to later, though it seemed like it should be able too, so maybe I jammed it? It looks level and it looks to be the same distance on all sides. It really looks quite centered, I just cant untwist the ring on the front most element. That seems to me to be the most likely problem, but maybe a different element might be off slightly? or could it really just be that soft to the left?
Any ideas what to do? |
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sammo
Joined: 04 Jan 2012 Posts: 223 Location: CH and SI
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Posted: Sat Mar 03, 2012 4:23 pm Post subject: |
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sammo wrote:
I don't have ideas what to do, but I also find my flektogon quite soft at edges when wide open.
I examined my photos (unfortunelly I don't have a test chart) and found that one edge is a bit softer (but it's not as bad and unsimetric as in your case). The only thing I did till now with the lens was to remove the rear lens and clean it, the lens wasn't open before ever, stupid as I was I forgot to note the rotational position of the lens. Is it possible that the rotational position of the rear lens has an efect to edge sharpness? |
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smallrewards
Joined: 19 Feb 2012 Posts: 4
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Posted: Sun Mar 04, 2012 12:46 am Post subject: |
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smallrewards wrote:
sammo wrote: |
I don't have ideas what to do, but I also find my flektogon quite soft at edges when wide open.
I examined my photos (unfortunelly I don't have a test chart) and found that one edge is a bit softer (but it's not as bad and unsimetric as in your case). The only thing I did till now with the lens was to remove the rear lens and clean it, the lens wasn't open before ever, stupid as I was I forgot to note the rotational position of the lens. Is it possible that the rotational position of the rear lens has an efect to edge sharpness? |
actually, i found that my lens is fairly sharp wide open, very decent.
After much analysis and testing I realized that DOF was the reason that my chart is so bad in the corners. I will post some pictures later when i get a chance. I tried to post my results in this thread a while back, but couldnt access it for some reason. |
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smallrewards
Joined: 19 Feb 2012 Posts: 4
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Posted: Thu Mar 08, 2012 5:51 am Post subject: finally fixed it |
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smallrewards wrote:
alright, so, I thought I had fixed it, but I printed my pics from the month (once a month I do so) and was horrified at how terrible the flek had done in comparison to the 50mm 1.4 fdn, so I swapped them out and determined not to use it anymore.
But then I went back, compared them, and realized something was wrong. Did a test shootout and knew something was turned the wrong way, misaligned, something.
I took all the lenses apart, everything seemed correct (except the very front element, I can not get it open for some reason, but it looks level and is not loose, so lets pray everything is ok!)
The following shots are just some test shots, the real test will be in use while out and about. These were all hand held tonight between 2.4 and 2.8, I believe the macro shots were 2.4-normal indoor lighting. Most had to be shot at ISO 1600,
nnrhighDSC04887 by bmglen, on Flickr
nnrhighDSC04870 by bmglen, on Flickr
nnrhighDSC04889 by bmglen, on Flickr
nnrhighDSC04893 by bmglen, on Flickr
focused close
nnrDSC04862 by bmglen, on Flickr
focused on the outlet plug
DSC04860nnr by bmglen, on Flickr
focused o the warning sign on seat
DSC04858nnr by bmglen, on Flickr |
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