![]() ![]() Most reviews have discussed how the Art lenses are so big and slow that they produce a beautiful image. In most reviews of third-party lenses like Sigma, the large sizes and slow focusing has been the tradeoff for the lower price. That’s also why the Sigma Art lenses have had slow autofocus moving big glass requires big motors, and the heavier the glass, the slower it moves. One way to make wide-aperture lenses more affordable is to use large lens elements instead of mechanically sophisticated ones. Sigma’s high-end Art lenses have traditionally been large, heavy beasts. We see fewer of those big glasses because it’s easier to make optics using advanced manufacturing and engineering to solve the optical problems those chunky glasses solved. If you think of the thick “coke bottle” glasses associated with nerds and geeks in shows about the 1970s and 1980s, that’s using the brute force of using big chunks of glass to modify incoming light. You can make a lens transmissive to light by making the elements larger or by making them with more sophisticated techniques than most lens elements. Most 50mm wide-aperture lenses are big and heavy. ![]()
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