+- Opticallimits (https://forum.opticallimits.com)
+-- Forum: Forums (https://forum.opticallimits.com/forumdisplay.php?fid=4)
+--- Forum: Sony (https://forum.opticallimits.com/forumdisplay.php?fid=14)
+--- Thread: next OL lens test - Viltrox AF 20mm f/2.8 FE (/showthread.php?tid=5636)
next OL lens test - Viltrox AF 20mm f/2.8 FE - Klaus - 11-27-2023
https://opticallimits.com/sonyalphaff/1183-viltrox20f28
Cheap and (quite) cheerful.
RE: next OL lens test - Viltrox AF 20mm f/2.8 FE - Rover - 11-27-2023
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).
RE: next OL lens test - Viltrox AF 20mm f/2.8 FE - Mistral75 - 11-27-2023
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')
RE: next OL lens test - Viltrox AF 20mm f/2.8 FE - Klaus - 11-28-2023
Ah, sorry, fixed.
RE: next OL lens test - Viltrox AF 20mm f/2.8 FE - toni-a - 11-28-2023
For field curvature I understand you measured center and border resolutions at different focus settings !!!
RE: next OL lens test - Viltrox AF 20mm f/2.8 FE - Klaus - 11-28-2023
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.
RE: next OL lens test - Viltrox AF 20mm f/2.8 FE - Rover - 11-28-2023
Still it looks like it destroys the Tamron 20/2.8... which has 7+ percent barrel distortion. Mindblowing.