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Lena
Joined: 24 Apr 2012 Posts: 495 Location: Pl
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Posted: Wed May 23, 2012 10:34 am Post subject: How to distinguish pre-AI Nikon lenses? |
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Lena wrote:
Help needed
Some ebay sellers do not include markings like Ai/AiS and non-AI in the descriptions.
I know pre-Ai lenses won't mount on my Nikon, but sometimes I just don't know what I'm looking at...
Is this one pre-Ai, for example? How to distinguish them?
http://www.ebay.co.uk/itm/Nikon-Nikkor-24mm-f2-8-wide-angle-lens-/150820236424?pt=UK_Lenses_Filters_Lenses&hash=item231d962c88 |
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sichko
Joined: 20 Jun 2008 Posts: 2475 Location: South West UK
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Posted: Wed May 23, 2012 10:48 am Post subject: |
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sichko wrote:
This one is Ais.
If you have the serial number you can use the photosynthesis site. _________________ John
Last edited by sichko on Wed May 23, 2012 10:51 am; edited 1 time in total |
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Nesster
Joined: 24 Apr 2008 Posts: 5883 Location: NJ, USA
Expire: 2014-02-20
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fotomachi
Joined: 02 Feb 2008 Posts: 638 Location: Estados Unidos de las Esferas Ultraterrenales
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sichko
Joined: 20 Jun 2008 Posts: 2475 Location: South West UK
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Posted: Wed May 23, 2012 10:55 am Post subject: |
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sichko wrote:
What's wrong with Ken Rockwell's site ? _________________ John |
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mdarnton
Joined: 03 Mar 2012 Posts: 78 Location: Chicago
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Posted: Wed May 23, 2012 11:04 am Post subject: |
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mdarnton wrote:
Some of the sources people have linked to are not quite correct. The essential difference--the one that matters the most--is whether or not the back of the aperture ring is a whole uncut surface (non-AI) or whether it's been cut back in several steps to allow clearance for the little tab that sticks out forward from the side of the lens mount at about 2:00 when there is no lens mounted. If there is no space on the back of the lens aperture ring for that tab to sit in without forceful interference, don't mount the lens. On some cameras there's another projection from the mount at 8:00 that senses when the lens has been set to its smallest aperture, and if so the appropriate cutting for that should be on the back of the aperture ring, also.
All of the stuff about rabbit ears having holes, double aperture stop scales, etc, will not actually tell you if a lens will mount properly and function--it has to do with Nikon's own way of making the original AI lenses, but it doesn't cover all of the possible ways to modify a lens later that various people have come up with or done at home.
The single most important issue is whether you're going to bend or break off that tab at 2:00 on the mount it you put on a lens.
All of the stuff about metering and nostrils in rabbit ears is nice to consider, but the most important thing is whether you're going to break your camera by mounting a specific lens. If you aren't, then the other stuff can be got around. _________________ small formats: http://flickr.com/mdarnton
large format: http://flickr.com/michaeldarnton
http://mdarnton.tumblr.com |
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Lena
Joined: 24 Apr 2012 Posts: 495 Location: Pl
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Posted: Wed May 23, 2012 12:00 pm Post subject: |
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Lena wrote:
Thanks a lot! |
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Lena
Joined: 24 Apr 2012 Posts: 495 Location: Pl
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Posted: Fri Jun 29, 2012 10:21 am Post subject: |
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Lena wrote:
There are some Helios or Mir lenses available in Nikon mount. Is it pre-Ai? |
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NikonD
Joined: 29 Jul 2008 Posts: 1922 Location: Slovenija
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Posted: Fri Jun 29, 2012 12:30 pm Post subject: |
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NikonD wrote:
If the aperture ring has a ridge bellow aperture numbers than it's AI/AI-S otherwise its non-AI/pre-AI and has to be modified |
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Gurdie
Joined: 29 Jul 2008 Posts: 997 Location: Finland
Expire: 2013-02-20
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Posted: Fri Jun 29, 2012 1:16 pm Post subject: |
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Gurdie wrote:
AFAIK, all Nikon-mount Russian made lenses are AI and can be mounted on all Nikon DSLRs, but only bodies from D200 upwards allow exposure metering. _________________ Markku
Give me two hours a day of activity, and I'll take the other twenty-two in dreams.
― Salvador Dali
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sichko
Joined: 20 Jun 2008 Posts: 2475 Location: South West UK
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Posted: Fri Jun 29, 2012 2:40 pm Post subject: |
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sichko wrote:
Gurdie wrote: |
AFAIK, all Nikon-mount Russian made lenses are AI and can be mounted on all Nikon DSLRs, but only bodies from D200 upwards allow exposure metering. |
The Helios 81M, 53 mm f/2, often appears with a Nikon mount. I've never used one but pictures on the bay show an absence of the characteristic Ai pattern on the aperture ring. _________________ John |
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Lena
Joined: 24 Apr 2012 Posts: 495 Location: Pl
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Posted: Fri Jun 29, 2012 4:50 pm Post subject: |
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Lena wrote:
I googled a bit on that and found this site
http://radojuva.com.ua/2012/03/review-lens-helios-81n-2-50mm/
If the author is right, Helios 81 lenses came in both pre-Ai and Ai mounts. Arsats are newer, so probably they would be Ai. |
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