ZWO FF 80/600 mm


Test images

R channel
G channel
B channel

Flat image

Nikon Z7II - 75 mm aperture stop - 6% vigneting on corners

Nikon Z7II - comparison of field center between one frame (top line) and a stack of 63 frames (bottom line):

Stray light and internal reflection

Up : 75 mm aperture stop (20s exposure)
Bottom : full aperture (15 s expsoure stop). Internal reflection probably come from the edge of one of the lenses.

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