New to devignette tools and experimenting a bit. Shooting with a full frame sensor (5D) and L lens. Would like to get some ball park settings until I get more experience myself.
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Hmm, being an XTi and "pro-sumer" grade lens user, I'm slightly surprised an L lens is giving vignetting problems. Full frame and L is what I expect to move to in about 3 years so I would not be happy to run into this.
However, a technique I used to correct vignetting from a Canon A1 ( [a href=\"http://www.amazon.com/Canon-Panorama-Waterproof-Camera-Battery/dp/B00016QMDW]http://www.amazon.com/Canon-Panorama-Water...y/dp/B00016QMDW[/url] ) to make this pano
http://www.pbase.com/andy_fraser/image/76517078 from 9 negatives was to take two shots straight up to a clear blue sky, the second shot after turning around 180 degrees (but still take the shot straight up). Convert them to monochrome, and combine them. The reason for taking two shots, is the graduation of light across the sky changes so the 2 combined images should produce a symmetrical mask.
This gives a correction mask for that specific particular camera & lens. I used that as a control layer to brighten up the corners of each image before merging. Without this, there were quite dramatic dark scoops across the upper and lower edges. Sorry I can't give more details such as what type of correction layer I used, but this method may give you a more specific correction mask for each lens. Experiment to see which type of layer gives the results you like.
In fact, just looking at the mask may tell you what kind of vignetting you have and whether a certain amount of overlap will avoid it.
Andy