M42 Screw Mount Lens to Nikon AI Body Adapter Ring - Black

Pros: - Very cheap - Build from aluminum - M42 lenses fit's OK - Very good for macro photography - It is easy to use and well made

Cons: - You cannot focus to infinty - Not so easy to unmount from camera

Other: Very useful if you own old M42 lenses. You need some skills to measure the exposure time so it can match the aperture and also keep in mind that you need to manually focus. You can see a photo taken with a 50mm f2.8 M42 lens here: http://triaxon.ro/wp/2013/03/12/where-the-wild-roses-grow/

Pros: screws nicely on my soviet Jupiter 9 objective very cheap can be used to DIY upgrade of webcam with objective of photographic quality.

Cons: I can't think of any cons.

Other: So to use this adapter, i will glue it to a lighttightly sealed box with a webcam or something else.

Pros: Product very cheap compared to what you can buy on Ebay, Amazon and co.

Cons: Due to construction of nikon cameras is unable to focus to infinity using this adapter or because the lens is few mm forward of what was to be. You can only focus on the maximum of about 7 meters.

Other: Quality very good construction respect to the price.

Pros: low cost, pretty quality stuf

Cons: lack of focus to infinity, frequent change of paint will wear off in places of friction, but it is not so important

Other: adapter is ideal for those that want to try taking pictures with old lenses, but I believe that it is better to buy AI Lens Adapter (for example http://dx.com/p/m42-ai-lens-adapter-ring-for-m42-lens-converts-to-nikon-ai-15476) for those who want to fully use the lenses with M42 thread