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Old 16th September 2013
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Ian Ian is offline
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Re: Comparing the new 12-40 Pro with the 12-60 SWD on an E-M1

OK, I have now spent some time looking at the images. Based on examination of the JPEG images, sadly, I have to put my hand up and admit two failings; the 12-60 40mm shots are very slightly mis-focused compared to the 12-40 shots and the 12-60 lens sample does look de-centred, with the top right looking sharper than the top left.

Therefore I have decided to re-shoot the entire exercise and will use a different 12-60 and hope it is a better sample. The weather today is much better and sunny although forecast to deteriorate this afternoon. I need to wait for the light to shine on the front of the building later this morning before I can start but I will publish new images this afternoon.

But given the above comments, at 25mm, comparing the best areas of the 12-60 to the 12-40 there is not much difference except of course the 12-40 is 2/3 or so stops brighter fully open and doesn't seem to lose much to the 12-60 at f/3.4. At 12mm wide open and this time both at f/2.8 I think the 12-40 has a very slight edge in sharpness but we'll have to see how a different 12-60 sample works out. Surprisingly, given that the E-M1 is supposed to correct Four Thirds lenses for distortion in the JPEGs there is still quite a bit of barrel distortion with the 12-60 compared to the 12-40. I should also add that the 12-40 was more consistent in focus accuracy (using CDAF) than the 12-60 (PDAF) although the conditions weren't ideal.

Finally, the previous comments elsewhere that have referred to reduced sharpness at f/5.6 - I can concur and can only think that is a diffraction issue as it appears to affect both lenses.

Ian
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