This is what Sigma calls their DF (Dual Focus) System. The Sigma 105mm f/2.8 EX DG Macro Lens uses a not-nearly-as-nice as HSM or USM 2-step combination of a push/pull clutch and an AF/MF switch to select the desired focus mode. Two sets (one white, one yellow) are provided. What can also be seen in the above photo are magnification markings on the extended portion of the lens barrel. The relatively small 58mm filter threads do not rotate when extended or retracted. What is also obvious from the comparison photo above is that the Sigma 105 Macro extends - by up to 1.8" (42mm) - when focusing.Īlthough not a big deal, when you are using a lens that extends while working with close subjects, care must be taken to not bring the lens in contact with those subjects. ![]() The same lenses (sans Canon 24-70 L) are shown fully extended (1:1 macro focusing distance) below. Sigma 180mm f/3.5 EX DG APO HSM Macro LensĬanon EF 24-70mm f/2.8 L USM Lens (for size comparison). This size be visualized in the chart and comparison images below. Opening the box and removing/opening the nice, well padded lens case reveals a very- nice-to-use sized, well-built lens. This Sigma lens also can be used as a normal 105mm short telephoto lens. Like most macro lenses (the Canon MP-E 65mm 1-5x Macro Lens excluded), The Sigma 105mm f/2.8 EX DG Macro Lens is - as you can discern from the name - Sigma's entry in the fixed short-telephoto focal length macro lens category.Īnd in this case, Sigma means a true 1:1, close-up macro lens. Note: The Sigma 105mm f/2.8 EX DG Macro Lens has been replaced by the Sigma 105mm f/2.8 EX DG OS HSM Macro Lens.
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