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The Sigma 20mm F1.8 EX DG ASP RF wide angle lens is designed for use with full frame digital cameras.

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Pros

output is consistent throughout the focal range, doesn't distort

1 agrees

AF is fast and accurate in almost any lighting

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low light photos remain sharp and clear

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excellent at close focus, can move right up to the subject

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built with heavier, more durable materials

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Cons

fairly heavy, tends to throw the camera a bit off balance

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some lens creep is noticeable, need to take the shot right away

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manual focus switch mechanism is a bit awkward

1 agrees

focus motor is fairly loud, not very subtle

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The Sigma 20mm F1.8 EX DG ASP RF wide angle lens is designed for use with full frame digital cameras. Offering an aperture of F1.8, this Sigma is a staggeringly fast super wide angle lens, capable of taking photos in low light conditions. Its two aspherical glass elements correct distortion, and the lens offers a minimum focusing distance of 7.9 inches, allowing for close-up shots. 

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