I am looking at buying a Sigma 70-300mm f4-5.6 telephoto lens for my Canon 300D and have seen two. A DG Macro & an APO DG Macro, please can someone explain the difference and the extra "APO" bit? Thanks
Not going to get technical, you can easily do a search on google for apochromatic. Just want to say buy the apo version. It is much better, a really very sharp lens. Great for the price. Highly recommended.
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