Ayoul wrote: philip_pj wrote:
Sony published MTF for the new GM, and it's possible to get some idea of the differences from them and the corresponding data for the ZA. You cannot tell much without the 'fine detail' 40 lpmm which is what the high resolution sensors pick up (and the likely source for the midzone commentary), but the general pattern is available and these data derive from the same source - Sony.
The 30 lpmm green lines are therefore comparable here. In the ZA at f1.4, as you ask it to resolve finer detail it quickly drops maybe 15% from centre, then provides even performance for the entire frame. At f1.2 the GM center is a little stronger and stays that way longer, then commences a steady gradual decline to the corners. So, a stronger larger centre followed by lower outer frames. It falls off below the ZA level once past the short edge of the frame (12mm).
It seems indeed a little bit weaker than the ZA in the corners then. HelBen85 was right. However according to the MTF the new 50 1.2 will have a more natural decrease in sharpness from center to corners than the ZA. It will be interesting to compare them at 1.4.
We talk about f1.2 vs. f1.4. Stopping down will improve corners a bit, too. Additionally, these are not measured MTFs. I would be _very_ careful using those. Compare them for the f1.4 to the actually measured MTFs from lensrentals.com showing the strong midzone dip in sharpness (both my copies have that clearly). Then factor in field curvature, which can skew these comparisons.
So unless both are compared side by side and analyzed, this is all moot.
From Cameralabs, infinity, Sony A1, f1.2
Ayoul wrote: philip_pj wrote:
Sony published MTF for the new GM, and it's possible to get some idea of the differences from them and the corresponding data for the ZA. You cannot tell much without the 'fine detail' 40 lpmm which is what the high resolution sensors pick up (and the likely source for the midzone commentary), but the general pattern is available and these data derive from the same source - Sony.
The 30 lpmm green lines are therefore comparable here. In the ZA at f1.4, as you ask it to resolve finer detail it quickly drops maybe 15% from centre, then provides even performance for the entire frame. At f1.2 the GM center is a little stronger and stays that way longer, then commences a steady gradual decline to the corners. So, a stronger larger centre followed by lower outer frames. It falls off below the ZA level once past the short edge of the frame (12mm).
It seems indeed a little bit weaker than the ZA in the corners then. HelBen85 was right. However according to the MTF the new 50 1.2 will have a more natural decrease in sharpness from center to corners than the ZA. It will be interesting to compare them at 1.4.
We talk about f1.2 vs. f1.4. Stopping down will improve corners a bit, too. Additionally, these are not measured MTFs. I would be _very_ careful using those. Compare them for the f1.4 to the actually measured MTFs from lensrentals.com showing the strong midzone dip in sharpness (both my copies have that clearly). Then factor in field curvature, which can skew these comparisons.
So unless both are compared side by side and analyzed, this is all moot.
From Cameralabs, infinity, f1.2
Ayoul wrote: philip_pj wrote:
Sony published MTF for the new GM, and it's possible to get some idea of the differences from them and the corresponding data for the ZA. You cannot tell much without the 'fine detail' 40 lpmm which is what the high resolution sensors pick up (and the likely source for the midzone commentary), but the general pattern is available and these data derive from the same source - Sony.
The 30 lpmm green lines are therefore comparable here. In the ZA at f1.4, as you ask it to resolve finer detail it quickly drops maybe 15% from centre, then provides even performance for the entire frame. At f1.2 the GM center is a little stronger and stays that way longer, then commences a steady gradual decline to the corners. So, a stronger larger centre followed by lower outer frames. It falls off below the ZA level once past the short edge of the frame (12mm).
It seems indeed a little bit weaker than the ZA in the corners then. HelBen85 was right. However according to the MTF the new 50 1.2 will have a more natural decrease in sharpness from center to corners than the ZA. It will be interesting to compare them at 1.4.
We talk about f1.2 vs. f1.4. Stopping down will improve corners a bit, too. Additionally, these are not measured MTFs. I would be _very_ careful using those. Compare them for the f1.4 to the actually measured MTFs from lensrentals.com showing the strong midzone dip in sharpness (both my copies have that clearly). Then factor in field curvature, which can skew these comparisons.
So unless both are compared side by side and analyzed, this is all moot.
Ayoul wrote: philip_pj wrote:
Sony published MTF for the new GM, and it's possible to get some idea of the differences from them and the corresponding data for the ZA. You cannot tell much without the 'fine detail' 40 lpmm which is what the high resolution sensors pick up (and the likely source for the midzone commentary), but the general pattern is available and these data derive from the same source - Sony.
The 30 lpmm green lines are therefore comparable here. In the ZA at f1.4, as you ask it to resolve finer detail it quickly drops maybe 15% from centre, then provides even performance for the entire frame. At f1.2 the GM center is a little stronger and stays that way longer, then commences a steady gradual decline to the corners. So, a stronger larger centre followed by lower outer frames. It falls off below the ZA level once past the short edge of the frame (12mm).
It seems indeed a little bit weaker than the ZA in the corners then. HelBen85 was right. However according to the MTF the new 50 1.2 will have a more natural decrease in sharpness from center to corners than the ZA. It will be interesting to compare them at 1.4.
We talk about f1.2 vs. f1.4. Stopping down will improve corners a bit, too. Additionally, these are not measured MTFs. I would be _very_ careful using those. Compare them to the actually measured MTFs from lensrentals.com showing the strong midzone dip in sharpness (both my copies have that clearly). Then factor in field curvature, which can skew these comparisons.
So unless both are compared side by side and analyzed, this is all moot.
Mar 18, 2021 at 06:04 AM
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