GH5 Strange vignette on Gh5S

[Jim Arthurs]

The general goal of the GH5s multi-aspect sensor design is to be a sensor physically large enough to allow the various aspect ratios (4:3, 3:2, 16:9, 17:9) to be the largest rectangle they can be inside of the MFT image circle.

 

[Denny16]

And each aspect ratio uses the same number of pixels, with no sensor cropping. Each aspect ratio also has a consistent look at any given focal length.
Cheers

 

[dtocco]

This lens arrived today and is perfect on the GH5s. Extremely barreled and wide in C4k and UHD, and no vignetting whatsoever. I use fisheye a ton and this is a great purchase. Thanks to everyone for their input!!

https://www.bhphotovideo.com/c/product/822810-REG/Rokinon_FE75MFTB_7_5_mm_f_3_5_Fisheye.html