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Thomas, read through this review and note the comments re light leak on the Volna 80mm medium format lens:
http://www.pentaconsix.com/StandardLenses.htm
As for the focal length, 80mm lenses provide the normal angle of view on a medium format camera with a large image circle, so you are correct the 80mm on a medium format camera would provide a similar field of view to a 50mm on a 135 film camera. But if you put that 80mm lens on a 135 film camera with a smaller sensor with no other optics, you will be cropping the image circle so that your angle of view is closer to a stills portrait lens.
If you put the 80mm lens on the URSA, it’s going to feel like a medium telephoto due to the greater crop of the image circle. Depending upon the perspective you actually prefer, that may seem fine to some or it may seem too flat for an intimate portrait.
As you know on a 135 film camera, a typical stills portrait lens is 85mm. If you like that ‘look’, then on the URSA you could use a 50mm lens designed for a 135mm camera or a 35mm lens designed for a medium format camera.
I don’t think you want the Volna 80mm for these two reasons.
Since I don’t use medium format lenses, I hope I haven’t got this wrong!
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