I always like to ask myself what makes a camera special or different. Where does it fit in? What's the point? The answer here is that the Canon EOS 30D is a mid-level DSLR that fits in between the Canon Rebel line and the Canon 1D line. No, I haven't forgotten the 5D — it fulfills a different purpose, and is meant as a less expensive version of the 1Ds Mark II. The 30D has the same sensor size (APS-C) and can use the same lenses (EF/EF-S) as the Canon Rebel cameras, while providing capabilities more akin to a 1D Mark II N camera: faster drive, better battery life, a very nice magnesium alloy body and grip, better low light sensitivity, and similar controls (Quick Control dial, for example). That means that if you own a Canon Rebel and you want to move up, the 30D is your best bet. You'll be able to keep using your old EF-S lenses while gaining pro-level capabilities similar to the 1D Mark II N.

Alright, let's get back to my criteria, and take it step by step:

Resolution

The 30D puts out 8.2 megapixels of beautiful resolution. That's fine by me. It's at my megapixel threshold, but I don't mind it. Keep in mind that higher resolution doesn't always mean better photos. If you don't believe me, have a look at my review of the Fuji Finepix S9100. Since I always shoot at maximum resolution and in RAW format, all of my photos came in at 3504 x 2336 pixels. I find that resolution sufficient for creative post-processing. I can crop or rotate photos and still retain enough resolution to make prints of 8x10 or larger dimensions. That's a good thing.

While I talk of cropping, I want to mention a pet peeve of mine. [rant] For goodness' sake, people: crop proportionally! I see so many photos on Zooomr and Flickr that have been cropped with no regard for a photo's aspect ratio whatsoever, and they don't look good at all. If you shoot at 3:2 aspect ratio, let your crop also be 3:2. If you shoot in 4:3, let your crop be 4:3 as well. (There are some exceptions to this rule, but I can't address them here. I'll probably write a separate blog post about it.) [/rant]

Image Sensor

As you can see from the specs, this is an APS-C sensor, with a 1.6x crop factor. It's also called a magnification factor, but I don't like to call it that because there is no magnification involved. A smaller sensor uses less surface from a lens' field of view (FOV), thus yielding a photo that looks like it was photographed from a smaller distance, but really wasn't. So while a photo taken with a 5D and a 100mm lens looks like it was shot with a 100mm lens, because the 5D has a full frame sensor, the 30D will yield a photo that looks like it was shot with a 160mm lens. It's like taking a photo with the 5D and cropping out 4 megapixels of resolution. You get the remaining 8 megapixels, and this makes it appear as if the photo is magnified, but it's not.