Not that it makes as much a difference as you may suppose, but the D90 Digital SLR has a puny (12.3MP) image sensor than the more affordable T1i Rebel (15.1MP). Using those specifications and applying a bit of common sense would lead a non technical person to believe that the digital rebel T1i is by far the smarter purchase.
As with many another things in this world and digital SLRs things are not always as apparent as they should be. The image sensor used by Canon at present, is not their optimum sensor.
Don't however, start believing everything you read on digital SLR packaging. The APS-C sensor deployed in the Rebel SLR T1i, will be severely tested to handle 15.1 megapixels in the best of situations.
To accomplish a higher megapixel rate, Canon selected to place the pixels closer , and to use smaller pixels than the Nikon D90 12.3MP uses. It's most commonly used way to get more pixels to fit on a smaller area. A more accurate indicator of image quality than mega-pixels, is pixel density. In this case, the Nikon D90 12.3MP comes in with much better numbers (lower is better here) of 3.3 vs 4.5 for the Canon Rebel T1i.
There are a few other considerations to prepare for, when buying a camera that has too many crowded pixels. As you go in search of extra lenses, you'll discover, that more megapixels usually means dropping more money on expensive lenses. The lenses designed to work with high megapixel camera are designed to resolve better, and virtually always cost the photographer.
Surprisingly though, the lens that's normally supplied (EF-S f/3.5-5.6 18-55mm IS) by the manufacturer with the T1i, is not one of those that is gifted at managing higher megapixel counts. We would never consider this standard lens for use with the T1i SLR, and would instead suggest investing a couple extra bucks in one of Canon's more precise zoom lenses like for instance the 17-85mm Canon EF-S IS or the 18-200mm Canon EF-S instead.
Hang on a moment, as I'm not even near done highlighting the problems with excessive pixel density. Excessive pixel density can adversely affect diffraction, dynamic range, and ISO. Upon further scrutiny, it would seem that our first assumption of the T1i SLR being better bang for the buck was slightly mislaid.
A well-thought-of quantify of image sensors using RAW data, is offered by DxOMark. Dx O Mark testing is not yet completed, but the digital rebel T1i uses the Canon EOS 50D sensor. The testing has shown, that the D90 SLR image sensor is considerably better than the Canon 50D sensor. The EOS 50D test data should be very close to the T1i SLR DxOMark testing, once it is made available.
Getting a good Digital Rebel T1i, is never an easy thing, especially with the way digital technology is constantly changing. Fortunately, there are plenty of helpful websites online, that can narrow down your search and help you find the Digital Rebel T1 camera with all the features important to you.
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