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https://opticallimits.com/sonyalphaff/1183-viltrox20f28
Cheap and (quite) cheerful.
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11-27-2023, 11:26 AM
(This post was last modified: 11-27-2023, 11:51 AM by Rover.)
Yay! An adorable looking little lens I must say.
... but the distortion chart doesn't show at least for me no matter how many times I try to reload (the file name is wrong, when I open it in a separate tab and edit `16` to `20`, I can see it).
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Indeed, the link is wrong https://opticallimits.com/images/8Reviews/lenses/viltrox_20_28/16mm_raw_distortion.png ('16mm_raw_distortion.png')
The right one seems to be https://opticallimits.com/images/8Reviews/lenses/viltrox_20_28/20mm_raw_distortion.png ('20mm_raw_distortion.png')
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Ah, sorry, fixed.
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For field curvature I understand you measured center and border resolutions at different focus settings !!!
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The focus field is rarely 100% flat. You won't even notice this with most lenses, so it doesn't make sense to add a note about it or create a dedicated flat-field MTF chart.
Usually, I only do this if I notice something unusual when using the lens out there or if it's crystal clear during the formal testing.
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Still it looks like it destroys the Tamron 20/2.8... which has 7+ percent barrel distortion. Mindblowing.
