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indianadinos
Joined: 06 Jul 2008
Posts: 1310
Location: Toulouse, France
Expire: 2011-12-05
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 Posted: Tue Mar 16, 2010 10:30 pm Post subject: Aaaaagh, i need your help ... |
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indianadinos wrote:
Hi all,
A friend of mine borrowed my Flek 20/2.8 and managed (apparently, trying to remove a filter he screwed in) to unscrew the whole optical group from the lens, which means that now i have my lens in two parts: the barrel and the inner optical group ...
I survived the choc (with my friend retaining me from strangling him), and now i'm stuck with the lens (i had a link on a Flickr set with the service tutorial, but the owner seems to have removed the pictures) ...
Anyone knows where to start to rebuild it properly ? Do i have to disassemble the focusing barrel, or i can try to screw in the optical group ?
The technique i suggested to another owner a few time ago (simply screwing in the optical group) doesn't seem to work well (i was thinking i fixed mine, but maybe it wasn't) ...
Thanks in advance to all for your replies ...
Cheers
_________________
Please visit my blogs Shooting with a Pentax K10D / FF Visions
Takumar: 24/3.5, 28/3.5, 35/2, 35/3.5, 50/1.4, 55/1.8, 85/1.8, 105/2.8, 120/2.8, 135/3.5, 150/4, 200/4
Pentax-K: M28/2.8, K28/3.5, M50/1.4, A50/1.7, M50/4 Macro, K85/1.8, K105/2.8, K135/2.5, M200/4, M70-150/4
Zeiss: Flektogon 20/2.8, 20/4, 35/2.4, 35/2.8, Tessar 50/2.8, Pancolar 50/1.8, Biotar 58/2, Sonnar 135/3.5, Sonnar 180/2.8
Meyer: Primagon 35/4.5, Domiplan 50/2.8, Oreston 50/1.8, Primoplan 58/1.9, Trioplan 100/2.8, Orestor 100/2.8, Orestor 135/2.8
Schacht/Steinheil: Travenar 90/2.8, Travenon 135/4.5, Quinar 135/2.8, Quinar 135/3.5
Russian: MIR 37B, Industar 50/3.5, Helios 44M & 44M-2, Jupiter 37A
P6: Flektogon 50/4, Biometar 80/2.8, Orestor 300/4
Nikkor: Nikkor-O 35/2, Micro 55/3.5, Nikkor-S 50/1.4, Nikkor-Q 135/2.8
Fuji: EBC 28/3.5, EBC 55/3.5 Macro, EBC 135/2.5
Misc Lenses: Kiron 105/2.8 Macro, Tamron SP90/2.5
... and a few other Vivitar, Tamron, Sigma and Soligor lenses ...
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Arkku
Joined: 28 Feb 2007
Posts: 1416
Location: Helsinki, Finland
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| Posted: Tue Mar 16, 2010 11:51 pm Post subject: |
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Arkku wrote:
So, can you just screw it back in? If so, and you have incorrect focus (e.g. won't reach infinity or will go over it), unscrew again and try again; you need to put it on specific threads to get the same focus.
(This is just speculation based on general experience, not this particular lens.)
Last edited by Arkku on Wed Mar 17, 2010 8:33 pm; edited 1 time in total |
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Kathmandu
Joined: 09 Dec 2009
Posts: 1479
Location: (Kathmandu,Nepal. Currently)Pacific Northwest, USA
Expire: 2012-04-08
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| Posted: Wed Mar 17, 2010 1:18 am Post subject: |
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Kathmandu wrote:
Lol@
| Quote: |
| I survived the choc (with my friend retaining me from strangling him) |
I do feel sorry for you.
I am sure you've seen this if its even similar I dont know
http://www.kolumbus.fi/uusilehto/img/lenses/zeiss/disass/
In this -looks like the focusing barrel has to come off and the front assembly unscrews from the aperture and rear cell. If yours is similar looks like the front assembly has to to screw back to the aperture and rear cell first , and then the focusing barrel screws back on last.
I have not personally opened or closed one of these before myself.
Regards |
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mo
Joined: 27 Aug 2009
Posts: 8982
Location: Australia
Expire: 2016-07-30
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| Posted: Wed Mar 17, 2010 4:19 am Post subject: |
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mo wrote:
I feel your pain ...no more loaning out your lens??
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Moira, Moderator 
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Anu
Joined: 14 Apr 2009
Posts: 879
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| Posted: Wed Mar 17, 2010 4:29 pm Post subject: |
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Anu wrote:
| Arkku wrote: |
So, can you just screw it back in? If so, and you have incorrect focus (e.g. won't reach infinity for will go over it), unscrew again and try again; you need to put it on specific threads to get the same focus.
(This is just speculation based on general experience, not this particular lens.) |
When I accidently unscrewed the front element(s) off my Flek 20/2.8, screwing it back caused infinity problems. The fix was to loosen (or was it tighten?) the infinity stopper screw, rotating an internal part that's normally blocked by it (of course first to the wrong direction  ), fixing the screw again and then reassembling the objective. The image quality improved greatly.
My hypothesis is that in the CZJ factory they had this lazy assembly worker who, instead of bothering to adjust the infinity properly, just screwed the front piece a bit loosely on. This hypothesis would explain the rather drastic differences in peoples experiences of this lens when used wide open. I wonder, if this copy of the original poster is also one which doesn't deliver as much as expected (especially wide open)? |
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indianadinos
Joined: 06 Jul 2008
Posts: 1310
Location: Toulouse, France
Expire: 2011-12-05
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| Posted: Wed Mar 17, 2010 6:08 pm Post subject: |
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indianadinos wrote:
Hi all,
| Arkku wrote: |
| So, can you just screw it back in? |
Yes, now that i remembered/noticed that the optical group screws in counterclockwise  now i can ...
Of course, i have to fix it now for infinity focus  ...
| Kathmandu wrote: |
| I do feel sorry for you. |
Me too ...
| Kathmandu wrote: |
| I am sure you've seen this if its even similar I dont know ... |
Yes, but the lens assembly seems to be not the same  ...
| Mo-Fo wrote: |
| I feel your pain ...no more loaning out your lens?? |
Niet, not even my Primoplan 50 ...
| Anu wrote: |
| When I accidently unscrewed the front element(s) off my Flek 20/2.8, screwing it back caused infinity problems. The fix was to loosen (or was it tighten?) the infinity stopper screw, rotating an internal part that's normally blocked by it (of course first to the wrong direction Wink ), fixing the screw again and then reassembling the objective. The image quality improved greatly. |
Do you have a photosequence of the service ?
Thanks to all for your replies ...
Cheers
_________________
Please visit my blogs Shooting with a Pentax K10D / FF Visions
Takumar: 24/3.5, 28/3.5, 35/2, 35/3.5, 50/1.4, 55/1.8, 85/1.8, 105/2.8, 120/2.8, 135/3.5, 150/4, 200/4
Pentax-K: M28/2.8, K28/3.5, M50/1.4, A50/1.7, M50/4 Macro, K85/1.8, K105/2.8, K135/2.5, M200/4, M70-150/4
Zeiss: Flektogon 20/2.8, 20/4, 35/2.4, 35/2.8, Tessar 50/2.8, Pancolar 50/1.8, Biotar 58/2, Sonnar 135/3.5, Sonnar 180/2.8
Meyer: Primagon 35/4.5, Domiplan 50/2.8, Oreston 50/1.8, Primoplan 58/1.9, Trioplan 100/2.8, Orestor 100/2.8, Orestor 135/2.8
Schacht/Steinheil: Travenar 90/2.8, Travenon 135/4.5, Quinar 135/2.8, Quinar 135/3.5
Russian: MIR 37B, Industar 50/3.5, Helios 44M & 44M-2, Jupiter 37A
P6: Flektogon 50/4, Biometar 80/2.8, Orestor 300/4
Nikkor: Nikkor-O 35/2, Micro 55/3.5, Nikkor-S 50/1.4, Nikkor-Q 135/2.8
Fuji: EBC 28/3.5, EBC 55/3.5 Macro, EBC 135/2.5
Misc Lenses: Kiron 105/2.8 Macro, Tamron SP90/2.5
... and a few other Vivitar, Tamron, Sigma and Soligor lenses ...
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peterqd
Joined: 28 Feb 2007
Posts: 7448
Location: near High Wycombe, UK
Expire: 2014-01-04
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| Posted: Wed Mar 17, 2010 6:39 pm Post subject: |
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peterqd wrote:
Dino, I've had this lens apart but I don't have any pictures. If the front lens block has simply unscrewed it shouldn't have affected infinity focus and you can just screw it back in.
Infinity focus is adjusted with the filter ring and I fear your friend has probably turned it when he was trying to unscrew the filter. The filter ring is clamped by a large screw ring like a lens ring. It has two notches and has to be tightened with a lens spanner. The annoying part is that the front lens block has to be in place in order to check the adjustment, and this makes getting at the notches very awkward. You need the type of spanner with the points closer together so that they can reach under the large front lens (I hope you understand that!).
I think maybe you should screw the lens block back in first and check infinity focus. With some luck it will be OK. 
I haven't fixed mine yet. I'll try and take some pics for you later this evening. I don't have time right now.
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Peter - Moderator |
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indianadinos
Joined: 06 Jul 2008
Posts: 1310
Location: Toulouse, France
Expire: 2011-12-05
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| Posted: Thu Mar 18, 2010 11:18 pm Post subject: |
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indianadinos wrote:
Hi Peter,
Thanks very much for your precious hints ... I will try to fix the lens this sunday (i fear i will not have the time to do it before) ...
It would be very nice if you could post some pics while fixing the lens ...
Many thanks again
_________________
Please visit my blogs Shooting with a Pentax K10D / FF Visions
Takumar: 24/3.5, 28/3.5, 35/2, 35/3.5, 50/1.4, 55/1.8, 85/1.8, 105/2.8, 120/2.8, 135/3.5, 150/4, 200/4
Pentax-K: M28/2.8, K28/3.5, M50/1.4, A50/1.7, M50/4 Macro, K85/1.8, K105/2.8, K135/2.5, M200/4, M70-150/4
Zeiss: Flektogon 20/2.8, 20/4, 35/2.4, 35/2.8, Tessar 50/2.8, Pancolar 50/1.8, Biotar 58/2, Sonnar 135/3.5, Sonnar 180/2.8
Meyer: Primagon 35/4.5, Domiplan 50/2.8, Oreston 50/1.8, Primoplan 58/1.9, Trioplan 100/2.8, Orestor 100/2.8, Orestor 135/2.8
Schacht/Steinheil: Travenar 90/2.8, Travenon 135/4.5, Quinar 135/2.8, Quinar 135/3.5
Russian: MIR 37B, Industar 50/3.5, Helios 44M & 44M-2, Jupiter 37A
P6: Flektogon 50/4, Biometar 80/2.8, Orestor 300/4
Nikkor: Nikkor-O 35/2, Micro 55/3.5, Nikkor-S 50/1.4, Nikkor-Q 135/2.8
Fuji: EBC 28/3.5, EBC 55/3.5 Macro, EBC 135/2.5
Misc Lenses: Kiron 105/2.8 Macro, Tamron SP90/2.5
... and a few other Vivitar, Tamron, Sigma and Soligor lenses ...
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CarbonR
Joined: 31 Dec 2008
Posts: 1969
Location: Clermont-Ferrand, France
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| Posted: Fri Mar 19, 2010 11:12 am Post subject: |
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CarbonR wrote:
Say to your friend he has to buy you a new lens at least in the same condition than yours, and you left him your 20/2.8 parts 
_________________
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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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