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Leon a Canon Super Telephoto does not vignette It merely follows the laws of physics to almost perfection! Seriously though flats are a must. What I do is wait till just after sunset and pointing the lens vertically take an image on the Av setting (the camera adjusts the exposure automatically for the set aperture) and then I set the camera to manual and for that aperture TRIPLE the exposure the camera used. This gives you a much better flat to correct with. I generally do 16 exposures and use ImagesPlus to combine with median stack and then convert to a grey image by using Luminance and Gamma (under Color) by using the default settings.
Next time I get down to Ballarat I'll try and get to your place to meet etc. You must be OK as we are both clog wogs! Dutch to those that do not know.
Bert
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