Lomo's 20mm New Russar+ Lens to Launch in August
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You can of course use this fully manual lens on digital cameras with the option of a a lens adaptor but APS C or M43 type sensors will have to take into account the crop factors of a full frame lens and hopefully realize that they are not buying into a wide angle.
For smaller sensors, you are probably getting between 35mm and 40mm in focal length, which isn't a bad thing considering the vignetting you see on full frame results.
The smaller crop factor reduces the frame and the less than desirable vignettes will be gone...so you have been warned.