[Cameramakers] Center filter

[John Cremati]

Hi,      I had just purchased a 75mm Rodenstock Gandagon N  f 4.5 wide angle lens .  It seems like a great lens with a 105 degree view... It has some noticeable light fall off though, enough to  irritate the optical nerve,  which left unattended will keep me up at night and  eventually will drive me insane.......        I was wondering if anyone had any ideas or thoughts  on creating their own center filter  photographically  as they are extremely expensive to buy... ...Regards, John Cremati