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+--- Thread: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING (/showthread.php?tid=5014)
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RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - Rover - 03-24-2021
Lenstip was quick to review the 40. Sample galleries for the other two are up, which tells me the reviews are imminent.
https://www.lenstip.com/index.php?test=obiektywu&test_ob=602
RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - Brightcolours - 03-24-2021
According to lenstip, the 40mm (lateral) CA is half that on FF than it is on APS-C. Nonsensical, it seems.
RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - Rover - 03-24-2021
They (almost) always get higher CA on APS-C than on FF. Even with the same lens tested on the same body.
Could they have simply mixed up red and blue dots?
RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - Rover - 03-24-2021
The 24 followed, and... It blows.
https://www.lenstip.com/index.php?test=obiektywu&test_ob=603
Completely with near-fisheye distortion if the corrections are off.
RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - toni-a - 03-25-2021
I was inquiring: with such massive distortions, after correction, some cropping is necessary, it's always a 24mm lens but does it keep the same angle coverage ??
Just a note, for such a lens it's distortions correction that will remove corners vignetting as it is cropped out rather than vignetting correction.
RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - Brightcolours - 03-25-2021
(03-25-2021, 05:02 AM)toni-a Wrote: I was inquiring: with such massive distortions, after correction, some cropping is necessary, it's always a 24mm lens but does it keep the same angle coverage ??
Just a note, for such a lens it's distortions correction that will remove corners vignetting as it is cropped out rather than vignetting correction.
A 24mm lens with strong barrel distortion has a wider FOV (diagonally) than a well corrected lens. Correcting the image will give a similar FOV than a well corrected lens, but will lose resolution.
RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - toni-a - 03-25-2021
(03-25-2021, 05:48 AM)Brightcolours Wrote:(03-25-2021, 05:02 AM)toni-a Wrote: I was inquiring: with such massive distortions, after correction, some cropping is necessary, it's always a 24mm lens but does it keep the same angle coverage ??
Just a note, for such a lens it's distortions correction that will remove corners vignetting as it is cropped out rather than vignetting correction.
A 24mm lens with strong barrel distortion has a wider FOV (diagonally) than a well corrected lens. Correcting the image will give a similar FOV than a well corrected lens, but will lose resolution.
Thanks, make a lot of sense, the funny thing is that distortions correction is very effective on vignetting !!!! the dark area is simply cropped out I guess it is better to activate both vignetting and distortions correction
RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - mst - 03-26-2021
(03-24-2021, 03:55 PM)Rover Wrote: They (almost) always get higher CA on APS-C than on FF. Even with the same lens tested on the same body.
Could they have simply mixed up red and blue dots?
I assume it's because of the scale they use (%). Question is: percent of what? Image size in some way seems plausible (I didn't find an explanation of the scale on their site), in that case it would seem possible that the percentage values on crop are higher than on full frame if the absolute CA values are similar.
RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - Brightcolours - 03-26-2021
(03-26-2021, 10:35 AM)mst Wrote:CA gets worse the further you get from the center. So, if it is percentage of image height/width, CA should be similar for FF and APS-C. Not worse for APS-C than for FF...(03-24-2021, 03:55 PM)Rover Wrote: They (almost) always get higher CA on APS-C than on FF. Even with the same lens tested on the same body.
Could they have simply mixed up red and blue dots?
I assume it's because of the scale they use (%). Question is: percent of what? Image size in some way seems plausible (I didn't find an explanation of the scale on their site), in that case it would seem possible that the percentage values on crop are higher than on full frame if the absolute CA values are similar.
RE: SONY FE 50mm F2.5 G,FE 40mm F2.5 G, FE 24mm F2.8 G COMING - mst - 03-26-2021
(03-26-2021, 01:44 PM)Brightcolours Wrote: CA gets worse the further you get from the center. So, if it is percentage of image height/width, CA should be similar for FF and APS-C. Not worse for APS-C than for FF...
Yes, if it's a linear relation. But if they don't explain the scale, that's impossible to judge.