All About Photographic Lenses. Specifications, comparison, reviews, MTF-charts for lenses by Canon, Nikon, Sony, Pentax, Olympus, Sigma, Tamron, Carl Zeiss, etc.
In this section you can buy and sell extenders for lenses, as well as macro rings, macro furs, converters, adapters, conversion lenses, etc. Help with using the Marketplace
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