I decided to test my lenses to see how they performed in comparison to each other when the focal lengths overlapped. It took me a few afternoons and was fun. The subject of the tests was the thermometer on my barn, shot from about 30 feet away. I learned a lot about my particular lenses. I've posted these test images, sample images, and comments to give you my impression of each of these lenses.
:: Canon 70-200mm f/4L Lens Test & Review ::
:: Tamron SP AF 28-75mm f/2.8 XR Di LD (IF) Lens Test & Review ::
:: Canon EF 50mm f/1.8 II Lens Test & Review ::
:: Canon EF 300mm f/4L IS USM Test & Review ::
:: Tamron AF 70-300mm f/4-5.6 Di LD Macro Lens Test & Review ::