Sigma 17mm f/4 DG DN C (Contemporary) Full-Frame Autofocus Lens for Leica L-Mount, Black {55}

Sigma 17mm f/4 DG DN Contemporary: ultra-wide full-frame prime built small

At 225 grams and just 49mm long, this lens is genuinely pocketable by full-frame standards. The 17mm focal length gives you an ultra-wide perspective on a 35mm sensor, and Sigma kept the optical formula tight at 9 elements in 8 groups, incorporating three aspherical elements and two super low dispersion elements to control distortion and fringing across the frame. A stepper motor drives autofocus via internal focusing, so the front element stays put and the balance in your hand doesn't shift during AF.

The aperture ring is a real one, clickable for traditional shooting or de-clicked for smooth video pulls. Seven rounded diaphragm blades close down to f/22. The 55mm filter thread is a practical size, and weather sealing means you're not watching the sky nervously on a shoot. The closest focus distance of 0.12m, combined with a 0.27x maximum magnification, lets you push into foreground elements in a way that most ultra-wides can't.

For the money this focal length and build asks, you're getting a well-rounded tool that doesn't compromise on optical engineering to hit its size target.

Who It's For

Landscape photographers who want foreground-to-horizon depth without hauling a heavy kit will find the 17mm perspective and 0.12m minimum focus distance genuinely useful together. Street and documentary shooters benefit from the compact 225g body that draws less attention on the street while still covering a full-frame sensor. Architectural and interior photographers gain from the weather sealing on location jobs where conditions are unpredictable. Video shooters working on L-Mount mirrorless bodies will appreciate the aperture ring and stepper motor AF for controlled, quiet operation during recording.

Key Features

• 17mm f/4 prime on L-Mount, full-frame coverage
• 9 elements in 8 groups with 3 aspherical and 2 super low dispersion elements
• Stepper motor autofocus with internal focusing, no front rotation
• Clickable aperture ring with 7 rounded blades, de-clickable for video
• 0.12m minimum focus with 0.27x magnification for close ultra-wide work
• Weather sealed, 55mm filter thread, 225g with 49mm length
• f/22 minimum aperture, no image stabilization

FAQ

What's the field of view on the 17mm at f/4?

On a full-frame 35mm sensor, 17mm gives you an ultra-wide perspective. Exact field-of-view angle isn't stated in Sigma's published specs for this lens.

Can you use this lens for video?

Yes. The de-clickable aperture ring lets you make smooth f-stop pulls during recording, which is the main video consideration for a prime lens this wide.

How close can you focus, and what's the magnification?

Minimum focus distance is 0.12m (4.72"), with 0.27x maximum magnification. That's closer than most ultra-wides, so you can work with foreground elements without resorting to extension tubes.

Does it have image stabilization?

No. At 17mm, you're wide enough that hand-held shutter speeds stay manageable in most light, and the compact weight (225g) helps with handheld stability.

What's the weather sealing like?

The lens has weather sealing, so it'll handle light rain and dusty conditions. Not a guarantee against full submersion, but solid for field work.

How does the autofocus perform?

A stepper motor handles AF via internal focusing, so the front element doesn't rotate and balance doesn't shift during focus. Speed isn't published by Sigma for this model.

Is there a tripod collar?

No tripod collar. At 225 grams and 49mm long, the lens is light enough that most shooters don't need one, but it's worth knowing if you shoot with a ball head and want to balance the camera on the lens.