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Old Dec 2, 2010, 4:37 PM   #51
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There's a big difference between 18mp and 12mp.
Not so much. The 18MP image from a T2i has a resolution of 5184x3456, while the 12MP image from a D90 is 4288x2848. That's a difference of about 20%, or the difference between a 100mm lens and a 120mm lens. There isn't a lot of difference in the angle of view, so there isn't a lot of cropping you can do to try to make up for a shorter focal length.
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Old Dec 2, 2010, 5:35 PM   #52
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From my experiences with a 5Dc and a 7D, I'm quite confident that there's an enormous difference in croppability of images from these two sensor sizes.
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Old Dec 2, 2010, 8:06 PM   #53
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If I'm not mistaken, one is a 'FF' dSLR and the other is an APS-C dSLR. That would be a bigger difference than the difference in the resolution.
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Old Dec 2, 2010, 9:32 PM   #54
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Yes, but the 7D is much more croppable than the 5D.
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Old Dec 3, 2010, 2:30 AM   #55
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isn't the 5d like 21mp?
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Old Dec 3, 2010, 5:32 AM   #56
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isn't the 5d like 21mp?
The 5DMkII is 21MP. The original 5D is 12.8MP. Either way, they're both 'Full Frame' dSLRs while the 7D is an APS-C dSLR, and at 18MP, yes, its images would stand up to more cropping than either the 5D or the 5DMkII, especially the original 5D.
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Old Dec 3, 2010, 8:06 AM   #57
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why would a full frame camera at 21mp not be able to take the crops as well as aps-c at 18mp? - if anything the reverse shoudl be true - more mp to lose in the 5dII and its not already testing the limits of the lens being a crop to start with like the 7d is
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Old Dec 3, 2010, 9:59 AM   #58
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Do the maths and you'll see why, for example, shooting a bird in flight with a given lens and a 7D is preferable to using the same lens on a 5D2. And yes, I do have a 5Dc, not a 5D2.
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Old Dec 3, 2010, 10:21 AM   #59
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So the "cropability" of an 18MP image from the APS-C 7D is better than the "cropability" of a 12.8MP image from a FF 5D. But it's more a result of the FF vs. APS-C thing, not so much from the 18MP vs. 12.8MP thing.
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Old Dec 3, 2010, 11:18 AM   #60
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Let me put a different spin on this discussion about cropping. The OP is interested in indoor low light photography. The reality is - in those conditions you can't crop as much as you'd want to anyway because of noise problems. Additionally in cluttered environments like that you run into focus issues when you use a lens "too short". This second part is a bigger issue. You just can't crop indoor action photos much no matter the MP for these two reasons - NOT when you're cropping to make up for distance. So no matter what camera the OP plans to use - they need the right focal length for THAT SENSOR (although aps-c is essentially a crop you don't have the same damage due to noise you do when you take a captured full frame image and crop it down).

Now - another important attribute for the specific needs of the OP - the 7d has a better focus system than the 5d (or 5dII for that matter).
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