40d has better iso performance than the 50d, let alone the T1i. The pixels are smaller on 50d to fit them all in - hence more noise. 40d is superior in every way to a T1i except in resolution, and LCD screen.





Go for a 40d. You wont be disapointed, and you'll save a hundred or so dollar towards better glass.





http://www.dxomark.com/index.php/eng/Image-Quality-Database/Compare-cameras/(appareil1)/180|0/(appareil2)/319|0/(onglet)/0/(brand)/Canon/(brand2)/Canon