Canon T1i and Canon T2i are both DSLR cameras. Canon T1i is also known as 500D. It comes with a sensor resolution 15 megapixel. This model of the Canon camera has an ISO range of 100 to 3200. The LCD screen resolution is about 920k dots. Canon T2i is an upgraded version of T1i. It comes with a sensor resolution of 18 megapixels.
This canon camera has an ISO range of 100 to about 6400. T2i has a high-quality audio recording option. The LCD screen resolution is 1040k dots. The T2i has a higher color depth, better frames with a single charge and a higher dynamic range. I hope you find this information helpful.
Take note that both are known to be DSLR cameras. These DSLR cameras may have some differences since their models are different. The t1i has a resolution of 15.1 megapixels while the T2i comes with a resolution of 17.9 megapixels. These are known to be both parts of the Canon DSLR rebel line. There may be other slight differences that you have to remember so that you know for sure that you are purchasing the right camera for you.
When you get the right camera, you know for sure that you will be able to use it to the best of your abilities. Take note that the t1i is known to have less shutter lag as compared to the T2i. You can always check out the settings of the cameras so that you can adjust it according to what you need.