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How does the 40D rate against the 5D?
5D is full frame. 40D 1.6 crop sensor. Larger sensor size usually equals better light sensitivity as the same resolution. But it really depends on what you want to use your camera for. I currently use a 5D as my back up/ travel camera. With the right lens it's capabale of producing beautiful images. Handling is better than 20D/ 30D in my opinion. However, it "only" does 4 frames per second. FYI, for commercial work I generally use 1D series cameras. As far as image quality and usability goes the 1D series blows the xxD series away. But the price up there with it.
So far the biggest drawback for me has been the lack of a decent spot meter in the 20D/ 30D. Apparently there now is one in the 40D. How well it works remains to be seen.
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Anyone know if the 5D is gonna be superseded too?
rumor has it Canon has a 5D follow up model ready but won't release it until Feb next year. it will have a 16 Mpixel full frame sensor, offer 5fps. If it will offer 6400 ISO remains to be seen.
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With regards to shutter speed to use, surely it depends on what effect you desire in your shots, frozen action, blurred background etc.
RE over/ underexpore, this is where the pro level cameras seem to have an edge over the consumer bunch. On the 1Ds II and 1D II I usually manage to get about 1stop +/- freedom if I shoot raw. In JPG it depends on the subject. Ideally you should get the exposure right in camera no matter what.
This is where experience comes in. Especially when you are shooting close up surf shot with lot's of white water the build in light meter often gets confused. You be able to get it right tough with a little bit of trial and error.
