In article ,
says...
Has anybody tried using centre filters on regular
35mm SLR lens to achieve a more even light fall-off?


No, but if you shoot color negative (or b&w) and scan
your film I have a tip on removing the vignetting using
Photoshop in the tips section of my web site.

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Robert D Feinman
Landscapes, Cityscapes and Panoramic Photographs
http://robertdfeinman.com
mail: