For example, most wildlife and sports photographers start with a 70-300mm f/4-f/5.6 lens. But, Canon and Nikon each make several different varieties, and third-parties (including Sigma and Tamron) make their versions, too.
While nothing replaces hands-on experience, that would require me to buy/rent/borrow several different lenses and then spend about a full day shooting with them and analyzing the results. In just a few minutes, I can look through DxOMark’s sharpness measurements and at least narrow down the playing field.
Finding Lenses
First, I browsed DxOMark to identify all the lenses in the 70-300 range for the Nikon platform that they had tested. It’s also a good idea to search at Amazon and B&H to see what else might turn up:
Continue reading How to Research Lenses Online Before Buying