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rosscova wrote:
Thank you all for the replies. What I'm gathering is that the biggest problem to be faced here is the size of the lens image circle, which is of course lens specific.
I can't speak of the Rokinon I mentioned, but I have definitely seen APS-C lenses cover full-frame sensors (some E mount Sony lenses, and some EF-S mount lenses), suggesting that it may not be uncommon for manufacturers to exceed the minimum coverage, at least on occasion. I notice in the comments at Beni's link above, someone links to an adaptation of the Fuji GX680 mechanism to the Sony a7, and I think a Sigma 14mm was being used with significant movements before any vignetting or mechanical shading could be seen. That is certainly a proof of concept, as is the getdpi OP itself....Show more →
I have been using the Canon TSE 17mm for a while and liked it. Then on a whim I bought the Kipon Nikon lens to E mount tilt and shift adapter.
Yes different lenses do have different size image circle. However that is fairly easy to fix. I just watch the edges when I am shifting and back off a bit when I see the dark edges.
However I found an issue that is a bit harder to correct. That is the image distortion with a ultra wide angle lens. Most wide angle will have a pin cushion distortion. A pin cushion is not too hard to correct in software. However the pin cushion turns into a wave when I shift. Now that I cannot correct in software. It is even more complicated than a mustache.
I guess that's why the Canon 17mm is more expensive. The distortion is really very subtle in the image and no correction is necessary.
So if you are planning to shoot straight lines with the SamYang 14mm with a tilt and shift adapter you need to keep this issue in mind. The SamYang has a lot of distortion as an ultra wide. When you add shift to the equation you may come up with a very funny looking straight line.
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