I have the following:
Canon 20D, Canon 18-55mm kit lens, Canon 50mm f1.8 lens, Tamron 28-75mm f2.8 lens, Sigma 70-200mm f2.8 EX HSM lens. I just purchased a Tamron SP AF1.4x TC to give me more reach for mylenses, which is due to arrive today. I would like to just bring along 1 lens and the TC when I go shooting. Since the Tamron works with just about any lens, I thought this would work great with all my lenses. I read though that the Sigma TC is best to use with the Sigma 70-200mm lens. Have I made too much of a sacrifice in terms of convenience vs photo quality? And is my assumption correct, that the Tamron TC will work with all my lenses?