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Lloyd Chambers has written on his blog about this lens https://diglloyd.com/blog/2023/20230307_2040-SonyFE20_70f4G-distortion-assessed.html. For subsribers, there's more.
Essentially he claims the lens is "unusable" for landscape because of the effects of distortion correction at the wider apertures. He also says that because in the corners you effectively need a 1.27x crop and resample you really are down to 40MP of resolution or less, starting from 60.
I just wanted to comment on some of that; it's sort of true and sort of, I think, misleading.
The true thing: the corners after correction will be less sharp than before correction. Of course. So if there are sharpness comparisons showing that you shouldn't be surprised (unless you see them in a whole unzoomed image at a normalise size: that'd surprise me at least)
The misleading thing: image resolution is not just about the MP of the sensor, or for that matter, the resolution of the lens. It's the product of the two. If you have a very high resolution uncorrected in the corners, and then you correct, and resample back to 60MP equivalent, the product of the (for arguments sake) 35MP equivalent sensor resolution in the corners and the high image resolution, resampled back to 60MP may still be very high. As high, or higher, than some good lenses with optical distortion correction on section of an un-interpolated, un-resampled 60MP sensor.
With the best of these electronically corrected lenses, this resultant resolution can be superb, easily good enough for landscape. I haven't used the 20-70; but the PZ 16-35 has huge correction at wider FLS, and I'm very happy with it's final image corner resolution, even peeping.
Will it be as good as the very best optically corrected primes, or super large optically corrected zooms? Probably not. But not easily visibly so, and in many cases better than the best lenses of not long ago.
So yes, as a performance geek, I'll be using Apo Lanthars, and some GMs and so on when it's convenient. But don't expect performance to be much worse on these electronically corrected small lenses. And for many purposes these lenses are astonishing. the PZ is a hikers dream, almost weightless. And the 20-70 is what I'll be buying when my leg works again and overseas travel is a possibility..
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