I bought this to use with my Canon 55-250mm IS lens. I was interested in macro photography for fun, but not enough to blow 300-700$ on a 1:1 macro lens. using the opteka I can manage to get 1:1 or larger, but with pretty heavy chromatic aberration. There is decent sharpness if you can work with the ultra thin DOF. Hand holding is out of question for the +4 and +10 macro filters. I was able to minimized CAs in Lightroom to some extent. This is ok if you just want to play with macro photography on a shoestring budget.If you can up your budget by about 200$, the Sigma 50mm 1:1 macro will probably be a much better buy.