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I've come to the conclusion that I had an exceptionally bad copy of the 24-105L lens. I believe most 24-105 owners would not need to go through this process.
Here is a centre crop and reduce fullframe at 24mm f4.0 using a 50D. This was a single 30 second exposure with cloud and moonlight interference. There is some minor coma at the edges, but IMO quite acceptable for nightscape shots. Comments?
Btw...the previous comparision was also done at the centre of the frame and at 105mm f4.0, but was slightly out of focus in the post shot. In the before shot the image was very mushy and this was the best I could do at the centre of the frame!.
Terry
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