The 28-135 lens doesn't even say what brand it is. I would not buy either of those two lenses. Remember it is the lens that really determines the quality of your images. I would rather save money on the body and get good lenses. You will replace the camera body a few times while keeping the lenses. It is also a good idea to buy lenses that will work on a full frame camera. When I bought my 5D MKII I was able to still use the lenses I already had for my 20D because I only purchased full frame capable lenses. You will be limited in your photography if you try to use slow lenses like F6.3. Also keep in mind that small sensor camera like the 50D has a 1.6 crop factor. This means a 100mm lense records images like a 160mm lense would on a 35mm camera.
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