In this article we will do a SLR camera comparison, between four models: Nikon D40, Nikon D90, Canon EOS Digital Rebel Xsi and the Canon EOS 40D.

The Nikon D40 digital camera has a resolution of 6 megapixels and an LCD that has 2.5 inches and 230,000 pixels. It can take photos at a maximum speed of 2.5 photos per second. The shutter speed of the camera is 1/4000 sec. The duration of the flash sync is 1/500 seconds.

This camera had help files included and you can also edit photos right from the menu. The ISO varies between 200 and 1600. If you want, you can also use a wireless remote with the camera.

One of the first digital cameras I purchased, going back every five or six years now was nothing more than a simple point-and-shoot Canon, but ended up costing me close to $1000. When I see what I can get today for thousand dollars in digital SLR cameras, it’s ridiculous.

Don’t count on using the LCD screen for taking your pictures. It’s a non-option with the Rebel XTi. You’ll have to stick with the optical viewfinder.

It’s what the pros are used to, and the XTi comes from a long line of predecessors catering to that market. Expect that to change in the future as technology advances, and manufacturers (Canon and others) bow to consumer pressure.

The Canon EOS 40D has less megapixels than two of the cameras above (10.1 megapixels), but it compensates with great performance for live action shots. It can take 6.5 photos per second, with a shutter speed of 1/8000 sec.

The camera’s body is made of magnesium and it has weather seals and a kit lens with image stabilization. It also comes with a built in cleaning sensor and Live view, which you can also use with an optional grid overlay. There are six program modes that you can choose from.

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