11-27-2023, 06:49 AM
11-27-2023, 11:26 AM
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).
... 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).
11-27-2023, 11:57 AM
Indeed, the link is wrong https://opticallimits.com/images/8Review...ortion.png ('16mm_raw_distortion.png')
The right one seems to be https://opticallimits.com/images/8Review...ortion.png ('20mm_raw_distortion.png')
The right one seems to be https://opticallimits.com/images/8Review...ortion.png ('20mm_raw_distortion.png')
11-28-2023, 04:58 AM
Ah, sorry, fixed.
11-28-2023, 05:52 AM
For field curvature I understand you measured center and border resolutions at different focus settings !!!
11-28-2023, 07:39 AM
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.
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.
11-28-2023, 01:42 PM
Still it looks like it destroys the Tamron 20/2.8... which has 7+ percent barrel distortion. Mindblowing.