Late, (still working on the backlog of old posts), it's not surprising that the XS or for that matter the regular DA 40mm would exhibit soft corners on film, so does the M 40mm f2.8, they all share the same optical design after all.

On 4/2/2013 6:09 PM, Mark C wrote:
I found the corners to be soft on film as well. Less so when focusing close than when at infinity. But it covered most of the frame well.

Mark

On 4/2/2013 9:55 AM, Zos Xavius wrote:
The 40XS has clearance for the mirror. Rice high posted samples from a 5dmk3 and it didn't fully cover the frame. The corners were very soft. Of course on film it might be better due to film handling oblique angles of light beter.






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