Fusing 12.3-megapixel image quality inherited from the award-winning D300 with groundbreaking features, the D90's breathtaking, low-noise image quality is further advanced with EXPEED image processing. Split-second shutter response and continuous ...
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Compatible with Nikkor and old Nikon lenses. Shoots beautiful shots. Low noise on high ISO settings makes it great for no light/ outdoor shooting. Continuous shooting at 4.5 fps make it great for firing off headshots.
If you're going to work in a studio setting with controlled lighting, I think the lens will be a bigger consideration than the camera body. You'll want a good prime portrait lens; something with a (35mm effective) focal length between 55 and 135mm, depending on how close you plan on being to your subject.
If you pick up a Canon body, such as the T2i or T3i, the Canon EF 50mm f/1.4 USM lens works out to 80mm equivalent (1.6x magnification factor on the smaller sensor), and would be a fine mid-distance portrait lens.
For closer shots with ~55mm equivalent, the Canon Wide Angle EF 35mm f/2.0 is little better than so-so... but it's really the only "normal" prime lens option for a 1.6 crop sensor that's under $1000. It is, thankfully, a fairly sharp lens; just a bit slow and noisy.
I'd actually recommend buying a used body through Craigslist; you might be able to find a better used 50D for around the same price as you'd pay for the T3i, or go with a used T2i and spend the money you saved on more/ better lenses.
You didn't ask this, but:
Buy a GOOD, SOLID tripod. It doesn't have to be an expensive name brand; even some of the Dolica off-brand ones will work fine for someone just getting started.
Buy a decent flash (a used 430 EX II maybe?) and see if you can spring for a basic beginner's lighting kit. A cheap 2-light Calumet or Promaster Kit is better than nothing. A really good starter choice is the Alien Bee brand; excellent value for the quality:
I love Canon for portrait shooting, or just people in general. Here are some basic specs:
18.0-megapixel CMOS (APS-C) sensor; DIGIC 4 image processor for high image quality and speed
Kit includes 18-55mm f/3.5-5.6 IS lens
ISO 100-6400 (expandable to 12800) for shooting from bright to dim light; enhanced 63-zone, Dual-layer metering system
Improved EOS Movie mode with manual exposure control and expanded recording 1920 x 1080 (Full HD)
Wide 3.0-inch Clear View LCD monitor; dedicated Live View/Movie shooting button
It's very similar to the 7D but much less expensive and extremely user friendly. It's also performs really well in environments that are bright or dim. You'll really love the quality and clarity.
I think with headshots in particular a lot of pressure is put on the photographer, not the equipment, and almost no matter what camera you have you can get a good shot if you know a thing or two about lighting and framing the shot... and capturing the subject for who they are.
This nikon is certainly among the best in the industry, and you will be able to get some beautiful shots with it. Very popular amongst photographers of all styles.