View previous topic :: View next topic |
Author |
Message |
andreiul
Joined: 18 Oct 2017 Posts: 6
|
Posted: Wed Oct 18, 2017 1:30 pm Post subject: Biotar 75mm F1.5 advice |
|
|
andreiul wrote:
Hello all,
I have a Biotar 75mm F1.5 with serial number 4910651 (estimative manufacture year 1957-1958).
I dismount the lens for cleaning, lubricate and fungus removal.
The job is almost done, but i don't know how to remove lenses no. 2 and no. 3 from drawings bellow (the fungus is between them)
If somebody know, please post here.
Thank you
|
|
Back to top |
|
|
kds315*
Joined: 12 Mar 2008 Posts: 16497 Location: Weinheim, Germany
Expire: 2021-03-09
|
Posted: Wed Oct 18, 2017 2:11 pm Post subject: Re: Biotar 75mm F1.5 advice |
|
|
kds315* wrote:
Welcome here!
Your posting will show now, anti spam measure
IF the fungus is between lens element 2 + 3 this would be rather bad, as this is a cemented (glued) lens group from what I know (as is 4+5) _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
Last edited by kds315* on Thu Oct 19, 2017 7:13 am; edited 2 times in total |
|
Back to top |
|
|
andreiul
Joined: 18 Oct 2017 Posts: 6
|
Posted: Wed Oct 18, 2017 4:14 pm Post subject: |
|
|
andreiul wrote:
So, there is no solution for detach those lenses? (lenses 4 and 5 are ok, without fungus).
Please note that the fungus between lenses 2 and 3 is not bad. There are few fungus and only at the lens edge. |
|
Back to top |
|
|
kds315*
Joined: 12 Mar 2008 Posts: 16497 Location: Weinheim, Germany
Expire: 2021-03-09
|
Posted: Wed Oct 18, 2017 5:58 pm Post subject: |
|
|
kds315* wrote:
andreiul wrote: |
So, there is no solution for detach those lenses? (lenses 4 and 5 are ok, without fungus).
Please note that the fungus between lenses 2 and 3 is not bad. There are few fungus and only at the lens edge. |
I would not worry and take the lens apart, so will not be able to see it in the resulting images, but you may lose optical centering / collimation _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
|
|
Back to top |
|
|
andreiul
Joined: 18 Oct 2017 Posts: 6
|
Posted: Wed Oct 18, 2017 7:22 pm Post subject: |
|
|
andreiul wrote:
Ok then; i already ordered a ring adapter for Canon EOS from aliexpress. After receive, i will take some test pictures. Then i will see if it is mandatory to dismount those 2 and 3 lenses.
Thank you very much for support!! |
|
Back to top |
|
|
kds315*
Joined: 12 Mar 2008 Posts: 16497 Location: Weinheim, Germany
Expire: 2021-03-09
|
Posted: Wed Oct 18, 2017 10:20 pm Post subject: |
|
|
kds315* wrote:
andreiul wrote: |
Ok then; i already ordered a ring adapter for Canon EOS from aliexpress. After receive, i will take some test pictures. Then i will see if it is mandatory to dismount those 2 and 3 lenses.
Thank you very much for support!! |
The worst it can happen is a slight loss of contrast which can always be corrected in post processing
It will never affect the sharpness...
Wishing you best of luck! Great lens it is.... _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
Last edited by kds315* on Thu Oct 19, 2017 7:11 am; edited 1 time in total |
|
Back to top |
|
|
visualopsins
Joined: 05 Mar 2009 Posts: 10462 Location: California
Expire: 2021-06-22
|
Posted: Wed Oct 18, 2017 10:43 pm Post subject: |
|
|
visualopsins wrote:
Welcome andreiul
Congratulations on your lens.
Yes, cleaning between cemented elements is not so simple with out tools and skills. First determine cement used to know solvent, and, to know if a substitute with similar index of refraction is available. Next clean, if possible. Then accurately align (colliminate) the elements while new cement cures. Cements can range from tree sap to uv-cured epoxy. If you are know you are capable, there should be no problems. _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200
Tele-Takumar 1:5.6/200, 1:6.3/300
Macro-Takumar 1:4/50
Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm
Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element),
Super-Multi-Coated Fisheye-TAKUMAR 1:4/17
Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500
Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100
Super-Multi-Coated Bellows-TAKUMAR 1:4/100
SMC TAKUMAR 1:1.4/50, 1:1.8/55
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto
|
|
Back to top |
|
|
andreiul
Joined: 18 Oct 2017 Posts: 6
|
Posted: Thu Oct 19, 2017 8:16 am Post subject: |
|
|
andreiul wrote:
Hello guys,
Thank you for advice, but i am still not able to understand now to remove the leses and also in which direction do i have to push.
Another question: the lenses 2 and 3 are glued one to another (on the surface) - i don't think so - or are glued to a metalic support (glued only on the edges)?
Perhaps i have to take some pictures of the actual stage of work.
The lens was in pretty bad condition. I mean it was very dirty and also the mechanism was almost stucked (because of the very old grease).
That's why i choose to dismount the lens until the last screw.
First i triyed to clean the mechanical parts and covers with dish soap. But after drying i saw that the old grease was still there. Then i tryied with isopropyl alcohol. Same result, unable to clean the grease.
Finally, i tryied with nitro diluent (for nitro paint) and finally, i was able to clean the old grease.
After that, i clean all the parts again with dish soap and then with isopropyl alcohol. Then dry with high pressure compressed air for cleaning the possible impurities.
After that all the components was sealed into a hermetic container with silicate gel, avoiding the water perspiration.
The last component is the front assembly (the one with the lens 2 and 3), which remain on the desk for trying to dismount those 2 lenses with fungus.
PS: In the meantime i finish to clean and grease last night a CZJ Tiotar 135 F4 (aprox manufacture year 1954), but this one has no fungus at all. Lucky me! |
|
Back to top |
|
|
kds315*
Joined: 12 Mar 2008 Posts: 16497 Location: Weinheim, Germany
Expire: 2021-03-09
|
Posted: Thu Oct 19, 2017 5:59 pm Post subject: |
|
|
kds315* wrote:
cementing lenses means glueing them together surface to surface using either canada balsam or UV hardened lens cement
***over-and-out*** _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
|
|
Back to top |
|
|
lucca1x
Joined: 09 Feb 2014 Posts: 93 Location: Romania
|
Posted: Thu Nov 02, 2017 9:46 am Post subject: |
|
|
lucca1x wrote:
My advice: leave that group as it is at least until you test the lens (or did you tried it already?). I hardly think it's fungus what you see between those elements. I rather believe it's deteriorated canada balsam and regluing it at home it's not an easy task and it implies heating, some nasty solvents for cleaning and fresh canada balsam.Also you have to recenter the elements.
Just try the lens as is and then if you still want to fix the problem just let a professional camera repairman to deal with it, although, depending on your location it could be hard to find one that works on 60 years old lenses. |
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|