taoger
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 Re: Sony FE 24-70mm f/2.8 GM Rolling Review | |
Thanks Fred,
I understand detraction could be an issue if stop down hard. But for 11 at the tele end, it is really not going to affect much to the details.
Sometime the F5.6 or 4 can give very strong center, but not always to the corner, the very separated Tan and Sag MTF make the corner not nice. The sag and Tan MTF are not always improved in sync, especially for the zoom at different focal lengths. For example, if F11 may be the best for Sag, but weaker for Tan, and F5.6 is best for Tan, but weak for Sag, and at all condition, Tan is always better than Sag, then in this condition F11 may give you a overall balance. it actually look nature and \"sharper\" to eyes even on MTF it is not on the peak. And after some sharpening, it indeed could surpass the F8.
The tele focal lengths tolerate well stopping down. my FE 70-200 can still have really decent details even stopped down to F16, there I can get very good DOF and corner quality. The defraction is quite easy to remove by adding some sharpness and details. For wide end, I rarely go smaller than F8.
Fred Miranda wrote:
taoger wrote:
Second this based on my observation of my copy as well. Nice job. Basically, at any focal length, there is a setting one can get very good corners (as you indicated with purple)
I feel that in the 60-65 range, F9-F11 are at similar peak performance, and 24-35 5.6-8 are at similar peak performance for corners.
for flattest field, it is around 40-55. I found the shots in this range are very pleasing. low CA, low distortion, low astigmatism, and very even and crispy sharpness in the whole frame.
SPDTDL wrote:
Sharpness Chart
My results for extreme corner sharpness, for landscape use.
1,000 test shots, 2 copies, 1 weeks worth of pixel peeping!
Your mileage may vary....
The problem is that once you close the aperture to f/9-f/11 (60-70mm), the peak corner performance will always be worse when compared to f/5.6-f/8 at the wider range. (due to diffraction)
The FE 16-35/4 performs similarly at the long range as 35mm needs f/9 for the corners. This is very common with zoom lenses and this thread proved to be a great resource for getting the best IQ out of the 24-70/2.8 GM lens. For example, we know we should not be shooting landscapes at 65-70mm at f/4 or f/5.6 but that\'s fine for wider focal lengths.
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