
Originally Posted by
neuroanatomist
In addition to exposure compensation, other things to check would be the Picture Style setting you're using on the 5DII vs. the XSi, the Auto Lighting Optimizer, and your white balance settings.
I'll also have a go at #5. The 100mm Macro is a short telephoto - on a FF body, it makes a very nice portrait lens (pretty wide aperture, sitting between the classic portrait length of 85mm and the 'head-and-shoulders' focal length of 135mm. Whether 100mm is long enough really depends on what you're trying to shoot, and what you're going to do with the shots. By that, I mean if you're shooting candids of people, etc., and are printing smallish sizes (or on-screen viewing only), with the 5DII's low noise you'll have a fair bit of cropping that you can get away with. But, if your goal is to shoot wildlife, etc., 100mm isn't going to be nearly long enough.
Given the IQ of the other lenses in your kit (with the exception of the 18-55mm kit lens, and as a side note, you need to update your profile!), I don't think you'll be thrilled with any of the consumer zoom options (e.g. 70-300mm IS USM). I'm one of those who really likes the 70-200mm (just got my EF 70-200mm f/2.8<span style="color: red;"]L IS II last week!). But I also have the EF 200mm f/2.8<span style="color: red;"]L II, which is the longest non-white Canon L-series lens. It's very sharp (though amazingly, not sharper than the 70-200 II at 200mm, which speaks volumes about the quality of the new zoom!). It's relatively light, fast, and not terribly expensive. But, if you buy the 200mm prime now and find yourself wanting the zoom later, that may not have been money well-spent (in my case, I think it was, but that's because I picked up the 200mm f/2.8 prime used on Craigslist for >40% less than the cost of a new one, and if I do decide to sell it, which is quite possible, I'll actually make a profit).
But, again, it comes down to what you're shooting. If you are going after birds and most wildlife, 200mm will still likely not be long enough. Even my EF 100-400mm f/4.5-5.6<span style="color: red;"]L IS on my 7D (=640mm on your 5DII) isn't long enough sometimes.
Good luck with your image processing issues and lens decision!
--John
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