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| p.2 #1 · p.2 #1 · announced: Kipon medium format focal reducer |
This seems like a realistic assessment. Just like a regular speedbooster gives you near full frame quality on apsc for certain lens/camera combinations, having a good full frame camera is better. In the absence of an affordable medium format camera, these Kipon adapters may be an interesting route for some people. If you have a number of matching lenses, having both a regular and a 0.7x adapter gives you more options.
My first idea for such an adapter was for use with other lenses with large image circles, such as a Canon FD 400/2.8. This will probably result in an impractical amount of bodging, but it is the kind of experiment I like. Ideally I would like a EF to E mount speedbooster of high quality with a larger diameter, so it would be more useful for really fast lenses and full frame cameras.