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(Slightly) inaccurate f/stop EXIF data for AIS lenses?


Richmond, US
28703 posts

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blw Moderator Awarded for his high level of expertise in various areas Nikonian since 18th Jun 2004
Sun 06-May-07 02:55 AM

I have a lot of old AI/AIS lenses that I use on my D2h. I have noticed that something typically goes wrong with the EXIF data for aperture on these lenses. For example, if I set the 135/f2 at f/8, I may it listed in the EXIF data as f/6.7; similarly if I set the 35/f1.4 at f/5.6, I often show f/5.3 or f/6.1 in the EXIF data. The odd thing is that it seems to show correctly in the finder - ie the 35/f1.4 above actually shows f/5.6 in the finder, even though I know that later the EXIF will say something else.

I am not precise enough with exposure to know if the meter is in fact off by a third stop or so. Certainly I have not noticed any such error.

Yes, I do set the non-CPU lens data every time I mount an AI/AIS lens.

Brian... a bicoastal Nikonian and Team Member

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