Which do you like more the 5d mk 3 or the 7D? From what I understand they are both more for sport photography and a shooting moving images. Whats the deal?
I love my 5dmk3, mainly for its low light abilities, but I've shot some amazing images from my 7d and 5d classic as well. For image quality, what is most important is the quality of light and to a lesser degree the lens and then the body. If I were you I would try to budget for a flash too. I have done some amazing stuff with my 5d classic which came out in 2005. The body mainly dictates how well it will do in bad light and how fast the autofocus will be for the most part. Here's a couple samples of mine from each body. These are all taken with good lighting just to show you how little of a difference the body makes. When looking at low light shots, it's impossible to truly get a good gauge on what the conditions were anyways.
5d mk1
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5d mk3
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7d
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The 7D definitely has less noise in lower light settings. The 5d classic is still very good though.
At minimum you'll want a 2.8 lens as far as speed goes. The lower the number the more light the lens will let in. However shooting at the lower number you will sacrifice the amount of depth that is in focus as well as some sharpness. For portraits I would shoot somewhere between 5.6-8 to maximize depth and sharpness
If you're doing strictly portraits I would go with a 5d classic off craigslist, Canon 85mm 1.8 lens, 430 exii speedlight, and an extra large betterbouncecard. The camera body would be more of a personal choice but I would aim for the other stuff I listed specifically.
The bigger the bounce card the better since it will mimic a larger light as well as soften the flash more. You don't want to blow out the subject with direct light because without some shadow the image will not have a 3d effect. The flash is used to give your camera more light to work with and to "lighten" up the shadows, not to get rid of them altogether. The bounce card will throw some light forward and if you can bounce a little off the ceiling you can control the shadows a bit, such as putting them a little below the eyebrows, nose and chin. If shadows are too dark it will make for a bad picture though.
http://www.abetterbouncecard.com/

Good lookin out.![]()
You can get the flash and lens off craigslist too. Glass doesn't go bad. If you're doing portraits, you'll want to stand as far away from the model as possible. The perspective is more desirable and it makes them look thinner. 85mm tends to be the minimum most portrait photographers like to shoot at.
What kind of photography do you specialize in?