Canon RF 10-20mm f/4 L IS STM Lens: A Wider Ultra-Wide


Canon has launched its widest RF-mount lens yet: the RF 10-20mm f/4 L IS STM, an ultra-wide zoom that serves as the mirrorless follow-up to the popular EF 11-24mm f/4L USM lens. Now expanding to 10mm, this new zoom has even broader coverage for more dynamic angles, along with a smaller, lighter body, optical image stabilization, and refined optics for excellent sharpness.

Canon RF 10-20mm f/4 L IS STM
Canon RF 10-20mm f/4 L IS STM

This 10-20mm lens is poised to become the go-to option for landscape, architectural, interior, and cityscape shooters, covering a versatile ultra-wide range and sporting a constant f/4 maximum aperture. Optically, it uses a variety of specialized elements to produce a well-corrected rectilinear image with very low distortion and aberrations; Air Sphere (ASC) and Subwavelength structure (SWC) coatings have been applied to cut flare from various angles.

Compared to the EF-mount 11-24mm lens, this 10-20mm is a formidable 1.3 lb lighter. In contrast to the RF-mount ultra-wide zooms, this new lens is 1 oz heavier than the 14-35mm f/4, 9.5 oz lighter than the 15-35mm f/2.8, and measures 4.4" long, which sits right in between the two RF lenses.

Besides being wider and smaller, this lens touts optical image stabilization, which affords up to 6 stops of Coordinated IS when used with select EOS R cameras. This is especially useful for stills shooters and can also help video shooters reduce some wobble when used in conjunction with digital IS. For autofocus, an STM stepping motor is employed to deliver quick and quiet focusing performance for photo and video. The 10-20mm has a close minimum focusing distance of 9.8", making it a great choice for unique close-up shots with broad depth of field.

In terms of handling and design, the lens has an assignable Control Ring, dedicated Focus and Zoom Rings, a programmable lens function button on the side of the barrel, and a built-in cut-gel filter holder at the rear of the lens. A built-in petal-style lens hood extends as far as the bulbous front element, and the exposed glass surface also features a fluorine coating to guard against fingerprints and smudging. As an L-series lens, this 10-20mm is dust and water resistant for confident use in harsh weather conditions.

For more information about the new lens, including additional features, specs, and highlights, be sure to check out the detailed product page for the RF 10-20mm f/4 L IS STM. Or drop us a line below, and we’ll do our best to reply to your comments and questions.



Let me know when it is stock for delivery.

In all the sample shots on Youtube no one is shooting faces. Maybe this lens straightens lines but how does it hold up shooting up close faces for vlogs? I have a feeling 10mm is still going to look cartoony but I would love to be proven wrong here. 

When do they build and sell the landscape version of the R? No video capability, 120 megapixel, to hell with high frame rates etc.?

Why is the guy looking at the back of the camera when the screen is turned around closed?   : )

I have used the 11-24mm f/4 and thought it amazing. I have wanted one despite the cost and weight. However, this 10-24mm is a game changer; 1 whole mm wider (that is a big deal folks) smaller, lighter, cheaper, and it promises greater optical performance since it it mirrorless thus more ideally situated to the sensor. 
What I could do with this lens!

I’ll keep my EF11-24 and use the RF Filter adapter with my drop in ND and Polarizer filters I already have. 

As an astro-photographer I would like to know how the corner sharpness is for stars.

The Canon RF 10-20mm f/4 L IS STM Lens (Canon RF) is very sharp. Note like all wide lenses at the widest setting you will get some distortion.  But it is low. 

I’ve been wondering what Canon would do about replacing the 11-24mm and this answers that. I love the 11-24 on my 1 series cameras but it is very heavy and this looks like an amazing replacement, and cheaper than the original 11-24. Thanks for the great intro video. Looking forward to the 10-20 on my R5 and anticipating the R1 some day.

The EF 11-24 is very cool. This new RF 10-20 sounds amazing since it too is rectilinear, not to mention much smaller and lighter than the 11-24.  Can't wait to check it out!