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djronbxs
Joined: 26 Jan 2011
Posts: 15
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 Posted: Fri Mar 16, 2012 12:48 pm Post subject: 3m-5a zm-5a 8/500 infinity focus |
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djronbxs wrote:
Hi,
I have the 3m-5a zm-5a 8/500 and im using an adapter from M42 to Olumpus E520. Im suspecting that it is not focusing to infinity. Is there a procedure to enable the lens to focus past infinity ?
thanks |
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ForenSeil
Joined: 15 Apr 2011
Posts: 2726
Location: Kiel, Germany.
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| Posted: Fri Mar 16, 2012 1:06 pm Post subject: |
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ForenSeil wrote:
What's the maximum focus distance?
Do you have a dremel or a proxxon or any other usable cutting- or grinding tool? If yes and the min. focus distance is not far away from infinity the easiest way without harming the lens would be to grind/cut the adapter to make it ~1mm shorter.
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I'm not a collector, I'm a tester 
My camera: Sony A7+Zeiss Sonnar 55/1.8
Current favourite lenses (I have many more):
A few macro-Tominons, Samyang 12/2.8, Noritsu 50.7/9.5, Rodagon 105/5.6 on bellows, Samyang 135/2, Nikon ED 180/2.8, Leitz Elmar-R 250/4, Celestron C8 2000mm F10
Most wanted: Samyang 24/1.4, Samyang 35/1.4, Nikon 200/2 ED
My Blog: http://picturechemistry.own-blog.com/
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djronbxs
Joined: 26 Jan 2011
Posts: 15
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| Posted: Fri Mar 16, 2012 1:09 pm Post subject: |
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djronbxs wrote:
im using this lens to take astrophotos |
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Laurentiu Cristofor
Joined: 23 Oct 2010
Posts: 524
Location: WA, USA
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| Posted: Sat Mar 17, 2012 11:09 pm Post subject: Re: 3m-5a zm-5a 8/500 infinity focus |
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Laurentiu Cristofor wrote:
| djronbxs wrote: |
Hi,
I have the 3m-5a zm-5a 8/500 and im using an adapter from M42 to Olumpus E520. Im suspecting that it is not focusing to infinity. Is there a procedure to enable the lens to focus past infinity ?
thanks |
It may be possible to partially disassemble the focusing ring to allow it to focus further. But I'm not familiar with this design to be able to tell you more. I remember that on my Tokina, I could adjust a ring with a stop piece, to determine the focusing range. I also remember that rugift used to have some instructions for how to perform a similar operation on the lenses they sell, but I wasn't able to find them right now. |
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fuzzywuzzy
Joined: 18 Dec 2010
Posts: 1258
Location: Down East, Canada, eh?
Expire: 2013-11-30
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| Posted: Tue Mar 27, 2012 11:34 am Post subject: Re: 3m-5a zm-5a 8/500 infinity focus |
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fuzzywuzzy wrote:
| djronbxs wrote: |
Hi,
I have the 3m-5a zm-5a 8/500 and im using an adapter from M42 to Olumpus E520. Im suspecting that it is not focusing to infinity. Is there a procedure to enable the lens to focus past infinity ?
thanks |
My copy will rotate well past the infinity mark on the lens, perhaps you're already past infinity and losing sharpness?
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NEX-F3
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CZJ Sonnar 135/4, Biotar 58/2, Pancolar 50/2, Tessar 50/2.8, Flek 35/2.8, Flek 25/4
Super Takumar 135/2.5, 135/3.5, 100/4 bellows, 50/1.4, 28/3.5
Helios 58/2, 3M-5A 500/8, Mir 20M
Vivitar Series 1 70-210 - - - - - - - - Nikkor 200/4
Rikenon 28/2.8 - - - - - - - - Zeiss 50/1.7 Planar
PB 50/2.4, 135/2.8
Yashica 50/1.9, 28/2.8, 135/2.8
Hexanon 28/3.5, 50/1.4 |
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