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I have a Soligor 450 mm lens with a 40 mm dia camera body end thread connection. I would like to try adapting it to a D90 AF system. Are there adapter rings available out there for this purpose?

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3 Answers 3

Soligor 450mm lens is a manual focus lens. There should be adapters, but none of them will make AF work.

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Assuming it is an M42 lens as some research on the particular model suggests, M42 to F mount adapters are readily available.

But since the M42 register is shorter than the Nikon one, you'll have to choose between two types of adapters: those which do not preserve infinity focus (by being indeed short extension tubes) and those who compensate with a generally poor quality element. In this peculiar case, with the difference being barely over 1 mm, some adapters without extra glass allegedly capable of infinity focus exist, but keep in mind the manufacturing tolerances on such cheap items are often too relaxed for being a critical component of the optical path.

As already stated by Evaldas, none of them will enable autofocus, especially since this lens has a minimum aperture of ƒ:8 and Nikon only guarantees operation of the AF (and focusing assist) system at apertures larger than ƒ:5.6.

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Well, newer Nikon bodies (such as the D800) can do AF at f/8, which is why some of us will buy the new 80-400mm with a 1.4 TC. However, even that won't help an M42 lens... None of them have AF that I'm aware of. –  John Cavan Apr 3 '13 at 2:08
    
Since you're manually focusing anyway, does it really matter if the manufacturing tolerances are off? (Assuming variation in thickness, as long as you get one that's thin enough....) –  mattdm Apr 3 '13 at 15:43
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@mattdm: Likely, as distance affects the focused distance and when those classic lenses claim a working distance of, let's say 1m~∞, that's it. Ironically, this could be a minimal issue with modern Nikkor ED lenses which focus can be adjusted further than infinity (allegedly to compensate for dilatation of the barrel, mount and elements at high temperatures)... –  Ryccardo Apr 3 '13 at 16:07

As already explained, M42 screw-mount lenses won't focus to infinity on F-mount bodies (Nikon and some Fujifilm SLRs) due to negative difference in lens-mount register distance.

But, since you're trying to use long telephoto lens, you would get working infinity focus, regardless of inherent mount incompatibility - long-focal lenses usually focus past infinity mark enough for smaller register difference. Since register difference between M42 screw-mount and F-mount is 1mm (45.46mm vs. 46.5mm), 450mm lens would probably focus to infinify just fine.

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