gjl711 wrote in post #9215907
If your looking at a camera in the 7D price range, heck, get the 7D.
It has better low light capability than the 40 and many improved features as well. It's a very sweet camera.
Not a whole lot of ISO improvement, frankly..... Maybe a stop, I'd estimate with the 7D. And as to features, besides the addition of video and wireless flash control (which you actually could get more fully featured with an ST-E2 module), the bump up in features is pretty specialized and not really as great as you might think. Not that the 7D isn't a sweet camera... it is. But it's the most specialized APS-C camera has produced to date and I feel it's actually more of a step down model from the 1D MkIV, than it is a step up model from the 40/50D. Not a bad thing in any way, but just be sure it's what you really need and want or you might be disappointed.
If low light shooting is the goal... unless you really, really need the sports/action orientation of the 7D... get a 5D MkII instead. That will give you a lot better low light shooting capability... probably two to three stops potential. Of course, it's more expensive than 7D, too. If that's a problem, you might look at used but not abused 5DII or even 5D classic.
But, I have to agree with previous responses... If you can't put your finger on what you want and why, or what you feel is lacking with the 40D, then you really should stick with it and wait a bit. I wouldn't recommend an "upgrade" to a 50D, for example. Not enough real difference between the 50D and the 40D. 7D really only brings more AF modes, many of which are specific to action shooting, better build and slightly higher resolution and ISO capabilities. Not a huge bump up. I suspect there will be a 60D announced come springtime, which might have a feature set that makes more sense, coming from 40D.
And, yes, glass before cameras... Always. Lens upgrades will do more for you than changing camera bodies. Don't know what you already use, so it's hard to advise really. One or more fast primes might augment a zoom kit, for example.