The Sigma 17mm F4 DG DN Contemporary for Sony E is one of the smallest full-frame ultra-wide primes you can buy. At 220g and around 5cm long it is part of Sigma's all-metal I series, and on an a7 IV, a7C II or a7R V it makes a very light kit for travel, street, interiors and vlogging.
Small and all metal
The barrel, focus ring and aperture ring are machined metal, and a magnetic metal lens cap comes in the box. Even with that build it is light enough to leave on the camera all day.
Close focus
It focuses down to 12cm, for a maximum magnification of 1:3.6. You can get very close to a foreground subject and still show a wide sweep of background, which is useful for food, details and handheld vlogging.
Image quality
The optical design has 9 elements in 8 groups, with two SLD and three aspherical elements. A quiet stepping motor drives the autofocus for stills and video.
Handling
There is a manual aperture ring and an AF/MF switch. The mount has a rubber seal against dust and splashes, and the 55mm filter thread is shared with several other I series lenses.
Who it's for
This suits travellers and vloggers who want an ultra-wide view in the smallest package. If you want more light for night shots, the Sigma 20mm F2 DG DN is two stops brighter, and the Sigma 24mm F3.5 DG DN is the same size with a slightly tighter view and 1:2 close focus.
Also available for L-Mount.
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