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+--- Thread: The Coming Oly EM1+12-40mm f2.8 MFT (/showthread.php?tid=1757)
The Coming Oly EM1+12-40mm f2.8 MFT - felix - 10-07-2013
Quote:What does this exactly mean? Can diffraction be cancelled by lens design? How is it possible?
No it can't (as far as I know of). I'll try to rephrase my statement:
Before the release of the 12-40/2.8 all Olympus mft standard zooms had a maximum aperture of f/5.6 (or f/6.3) at the long end, which is equivalent to ~f/11 on full frame. At this point diffraction effects already start to kick in. Look at the test results for the 14-42R, for example, and you will notice that stopping down actually reduces the resolution of the image.
In contrast, stopping down the 12-40/2.8 by one or two stops should yield a better lens performance (as usual when stopping down a lens), because you're not instantly diffraction-limited.
So, in the end, I expect the 12-40/2.8 to be the best performing mft zoom (produced by Olympus) at 40mm f/5.6.
I hope that was somehow more clear now... :ph34r:
The Coming Oly EM1+12-40mm f2.8 MFT - frank - 10-08-2013
Quote:No it can't (as far as I know of). I'll try to rephrase my statement:
Before the release of the 12-40/2.8 all Olympus mft standard zooms had a maximum aperture of f/5.6 (or f/6.3) at the long end, which is equivalent to ~f/11 on full frame. At this point diffraction effects already start to kick in. Look at the test results for the 14-42R, for example, and you will notice that stopping down actually reduces the resolution of the image.
In contrast, stopping down the 12-40/2.8 by one or two stops should yield a better lens performance (as usual when stopping down a lens), because you're not instantly diffraction-limited.
So, in the end, I expect the 12-40/2.8 to be the best performing mft zoom (produced by Olympus) at 40mm f/5.6.
I hope that was somehow more clear now... :ph34r:
Yes, this is also what I understand it. I thought Olympus had some magic tricks to deal with optical diffraction :ph34r:
The Coming Oly EM1+12-40mm f2.8 MFT - frank - 10-08-2013
Robin Wong published a comparison of E-M1 with E-M5: http://robinwong.blogspot.com/2013/10/olympus-omd-e-m1-review-comparison-with.html. It is hard to judge E-M1 has 1-stop advance over the E-M5 in high ISO. The in-camera anti-diffraction feature (by some kind of smart sharpening approch) looks remarkable, but is useless for RAW shooters.