Sigma 17-40mm f/1.8 DC Art Canon RF-mount

Name: Sigma 17-40mm f/1.8 DC Art Canon RF-mount
Brand: Sigma
SKU: 966621
Price: 999 EUR
Availability: InStock
Rating: 10 (3 reviews)

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Does this camera lens fit a Canon RF mount?
Does this camera lens fit an APS-C camera?
Is an f/1.8 aperture good for low light?
What do customers say about this model?

Pros and cons

According to our camera lens expert

Thanks to the large maximum aperture of f/1.8, you can take bright photos in low-light locations.
The autofocus motor focuses silently, so you won’t hear any distracting sounds in your videos.
You can take photos in the rain without any trouble thanks to the water-resistant design.
This lens doesn’t have image stabilization to help reduce motion blur.
When you use this lens with a lightweight camera, it might feel heavy.

Key specs

Canon RF mount

APS-C

Zoom lens

Standard, Wide-angle

535 g

Show all specifications

Description

Take clear photos in low light with the Sigma 17-40mm f/1.8 DC Art Canon RF-mount. This camera lens has a maximum aperture of f/1.8. That means the lens captures a lot of light, so you can take bright images in dark situations too. You can also take photos with a soft background blur. The silent autofocus motor stays quiet while it focuses. This way, you won't hear distracting sounds in your videos. The water-resistant design also works during a rain shower. The Canon RF mount fits RF and RF-S mirrorless cameras.

Tips for using this product

This is what you get

Manual
Lens cap (2x)
Lens hood

Reviews

Rating

5 stars

4 stars

3 stars

2 stars

1 star

Most helpful reviews

Our expert review

Versatile lens for clear photos

f/1.8 throughout the zoom range
Quickly adjust aperture with rotating ring
Smooth zooming with internal zoom
A bit too big for traveling

The Sigma 17-40mm f/1.8 DC Art is a fast zoom lens for APS-C cameras. It has a soft bokeh throughout the entire zoom range, which is why I like using it for portraits. I just find the design a bit too large for travel.

Large Aperture I tested this lens on my Sony A7 III in APS-C mode. This gives my full-frame camera a 1.5x crop, and it works just like an APS-C camera. The lens has a zoom range of 17-40mm, which on an APS-C camera is equivalent to 25.5mm to 60mm. I use this lens for various types of photography, from street to portrait. It has an aperture of f/1.8 throughout the entire zoom range. This is great, because it allows me to take bright photos even at 40mm. I find this especially useful when shooting portraits at night, for example.

Sharp images Throughout the entire zoom range, the lens produces sharp images with little distortion. Even at 17mm, the edges are sharp, while distortion is normally easily seen with wide-angle lenses. I also find the lens focuses quickly and accurately. I test this with a low aperture: I focus on my cat's eye, and when I zoom in afterward, I can see every individual hair around its eyes. When zoomed out, I use a higher aperture and bring the entire surroundings into focus.

Sturdy design The lens feels sturdy. At 535 grams, it's not very light, and especially when used with my A7 III, the whole setup feels heavy. If I shoot with it all day, my hands get tired quickly. If you use the lens with a smaller APS-C camera, you'll shoot for longer, but the lens tilts forward easily. The lens has three dials: a focus ring, a zoom ring, and an aperture ring. I find the aperture ring very useful. This allows me to immediately see the aperture I'm shooting at and adjust it quickly.

Silent, smooth zoom For videography, I also find the 17-40mm zoom range useful. I capture overview shots, but also zoom in on details. The lens has internal zoom, so it doesn't extend as I zoom in. This reduces vibration during zooming, resulting in smooth transitions. The lens also makes no noise when focusing, so I don't hear unwanted background noise in my videos.

Review by:
Nina. camera specialist.
Date:
17 July 2025
Translation:
Automatically translated from Dutch

Review is 10 out of 10.

Best total package for a standard zoom lens!

Of course the 1.8
Build quality
Internal zoom
No

Need I add anything to my five-star rating? After 35 years of photographic experience, testing numerous cameras (30+) and lenses (60+), I can confidently say I'm most impressed with this Sigma 17-40 1.8. And then I compare it to lenses like the GF 32-64 f/4 (medium format), RF 24-70 2.8 (FF), GM 24-70 2.8 (FF), XF 16-55 2.8 (APS-C), etc. Nowhere else does a lens offer the same features in a single package as this Sigma. The combination of compactness, low weight, internal zoom, build quality, weather sealing, the 1.8, and image quality is unparalleled. No other lens (standard zoom) ticks off so many positive attributes. Exceptionally light and compact for what it offers. Excellent sharpness in the center and very good sharpness at the edges. The bokeh is very beautiful, despite some less-than-positive reviews.

A worthy successor to the older, excellent 18-35 1.8. This is an "ART" lens from Sigma, and that name is more than ever lived up to here. A unique lens. Even the price is a real bonus. Congratulations, Sigma. Well done!

Review by:
Mario
Date:
6 September 2025
Translation:
Automatically translated from Dutch

Review is 10 out of 10.

Undoubtedly the best APS-C standard zoom lens of all brands!

Lightweight for this type of lens
Internal Zoom is better for weather sealing / video with Gimbal
Prime quality
Internal zoom is a PLUS but makes the lens larger than an external zoom which is more compact when retracted

I can safely say I'm seriously impressed with this Sigma 17-40 1.8. And that's comparing it to lenses like the GF 32-64 f/4 (medium format), RF 24-70 2.8 (FF), GM 24-70 2.8 (FF), XF 16-55 2.8 (APS-C), etc. Nowhere else does a lens offer the same features in a single package as this Sigma. The combination of compactness, low weight, internal zoom, build quality, weather sealing, the 1.8, and image quality is unparalleled. No other lens (standard zoom) ticks off so many positive attributes. Exceptionally light and compact for what it offers. Excellent sharpness in the center and very good sharpness at the edges. In my opinion, the bokeh quality is very good. A worthy successor to the older, excellent 18-35 1.8. This is an "ART" lens from Sigma, and that name is more than ever lived up to here. A unique lens roughly comparable to a 24-70 2.8 in full frame, which is often much heavier, much larger, and more than twice the price. Well done, Sigma! A truly fascinating lens!

Review by:
Mario
Date:
11 March 2026
Translation:
Automatically translated from Dutch

Insure your camera lens

Receive more coverage in case of damage than with your standard warranty. Coolblue takes care of everything: from taking out the insurance to repairs. Is a repair not possible? You receive the purchase price as CoolblueCredit.

What am I insured for?

Fall and impact damage
Water damage
Manufacturing defects outside the warranty
Theft(Optional)

What am I not insured for?

Damage you deliberately cause
Damage that doesn't affect the product functioning (such as scratches)
Damage due to gross negligence

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XCover is allowed to arrange and process insurances on behalf of the insurer. The insurances are governed by Belgium law. If you have a complaint, you can contact the or our customer service.

How do I insure my camera lens?

First, add your camera lens to your shopping cart. On the next page, choose one of the Protection Plans below. You always have a 30-day return window and pay no deductible in case of damage or theft.

XCover Protection Plan with theft cover

3-year advance payment
96,- one-time payment (32,- per year)
2-year advance payment
63,- one-time payment (31,50 per year)

XCover Protection without theft cover

3-year advance payment
46,99 one-time payment (15,66 per year)
2-year advance payment
29,99 one-time payment (15,- per year)

The insurance can be canceled every year, even if you have paid in advance. If you cancel earlier, you will receive a refund for the overpaid amount.

Sigma 17-40mm f/1.8 DC Art Canon RF-mount

Specifications

Product

Product
	Product number	966621
	Manufacturer code	214972
	Brand	Sigma
	Warranty	2 years
	Processing of your defect	Via Coolblue

Usage

Usage
	Lens type	Standard, Wide-angle
	Type of photography	All-round, Architecture and interior, Landscape, Nature photography, Portrait, Product, Recording

Suitable for

Suitable for
	Lens mount	Canon RF mount
	Suitable for camera type	APS-C
	Compatible with lens filter
	Filter size	67 mm
	Lens series	Art

Properties

Properties
	Zoom or prime lens	Zoom lens
	Number of aperture shutters	11
	Fixed aperture
	Number of groups	11
	Number of elements	17
	Type of lens elements	Aspherical, SLD
	Special lens elements
	Image stabilization

Focus

Focus
	Shortest focusing distance	28 cm
	Manual focus override
	Silent focusing motor
	Internal focus
	Focal distance control
	Autofocus

Physical properties

Physical properties
	Color	Black
	Weight	535 g
	Material	Metal
	Diameter	72,9 mm
	Length camera lens	115,9 mm

Resistance

Resistance
	Dustproof
	Shockproof
	Water resistance	Splash proof

This is the one

Sigma 17-40mm f/1.8 DC Art Canon RF-mount

Review is 10 out of 10, based on 3 reviews.

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Sigma 17-40mm f/1.8 DC Art Canon RF-mount