I need a way to check for vignetting when I am reaching the max of my lens's covering power. An image will look fine on the ground glass and I cannot detect any light falloff due to camera movements, but when I develop the negative the vignetting appears. I feel like I am making some dumb rookie mistake that I should know the answer to.
I am currently using a 14" Kodak Commercial Ektar lens on an 8x10 camera. A chart I consulted indicated the lens has an image circle of 444mm. Any help will be greatly appreciated.
Thank you
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