Quick test for ISCO-Gottingen Norelco Anamorphic Kiptar 2x lens. I use Panasonic GH2 with Nikon 50mm AF-D lens it seems there is no vignette at all. On full frame camera like 5D you would have to use 100mm to avoid vignette.
The lens is quite sharp even with the taken lens has f/2.0 aperture. However, it focus down to 2m so that would be a bit difficult to use in some cases.
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