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Comments about Sigma Sigma 50mm f/2.8 EX DG Auto Focus Macro Lens for Pentax AF Cameras:
For $[...], the Sigma f/2,8 DG EX macro lens is an excellent value. It works well as a macro lens but the focus is slower than the Pentax version and it better to take macros with the camera mounted on a tripod with cable release. It does work hand held however and also serves as an excellent low light lens indoors and outside.