Bargain! If I was shooting APS-C Canon I'd get one.
Just a note, you mention in the vignetting section how bad it is at f3.5 but it should say 4.5.
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This is even better than I expected from the MTF curves Canon provided. I thought it would be a f/8 lens. That it can be used wide open with minimal impact is a bonus.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
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With the EOS 100D, 10-18mm IS STM, 18-55mm IS STM and 55-250mm IS STM Canon has a pretty impressive light weight DSLR setup available now, which indeed is very affordable.
Only downside I see of this lens is the light fall off, the weight saving has to come from somewhere I guess. That is then the only thing to keep in mind (besides the CA) if I would want to modify one for FF (which would basically turn it into a 17-18mm f5.6 prime with IS and STM).
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Nothing to say but an absolute bargain, without the usual having to stop down at the wide end.
How on earth did they do that? I guess they are unlikely to tell anyone!
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