Canon RF 10-20mm F4 L IS STM is a Fixed aperture Auto Focus (AF)
Ultra-Wideangle Zoom lens with Optical Image stabilization and 35mm FF max sensor coverage, and it is designed to be used with
RF Mount cameras.
What type of photography is the Canon RF 10-20mm F4 L IS STM lens good for?
The type of photography that you are planning to use the Canon RF 10-20mm F4 L IS STM is an important decision factor. Here we have evaluated its suitability to various photography scenarios:
Canon RF 10-20mm F4 L IS STM is a member of Canon's RF L series of lenses. Below you can see the latest lenses in this series.
RF L Series Lenses in Canon RF Mount
Reasons to Buy Canon RF 10-20mm F4 L IS STM Lens
Here we've included a summary of the advantages and disadvantages of the Canon RF 10-20mm F4 L IS STM lens in a list form to help you determine whether it offers the features you need.
| Optical Image Stabilization (up to 5.0 stops) |
| Weather-sealed |
| Autofocus |
| AF/MF Switch on Lens |
| Stabilization On/Off Switch on Lens |
| Programmable Control Ring |
| Internal Focusing |
| Fast Aperture at Tele end |
| Constant f4 aperture throughout the range |
| Covers Full-Frame Sensor |
| 9 Diaphragm Blades for Smooth Bokeh |
| Extreme Wide-angle capability |
| Minimum focus distance of 0.25m / 9.8 inch |
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Lens Mount
Canon RF 10-20mm F4 L IS STM is compatible with cameras that have a Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R100, Canon R8 and Canon R50.
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Size, Weight and Filter Thread
Size and weight is a very important decision factor when searching for your next lens. Canon RF 10-20mm F4 L IS STM has a maximum diameter of 84mm and total length of 112mm. It weighs 570g / 20.1 oz.
Below you can find a scaled side-by-side image of Canon RF 10-20mm F4 L IS STM and Canon RF 14-35mm F4L IS USM (Canon RF mount) to get a better idea of how their sizes compare in real life. Check the detailed comparison of these two lenses here.
Comparison image of the Canon RF 10-20mm F4 L IS STM and the Canon RF 14-35mm F4L IS USM Size and Weight
![https://cameradecision.com/lenses/img/other/Canon-RF-10-20mm-F4-L-IS-STM-inhand.jpg]()
Canon RF 10-20mm F4 L IS STM Size
Focal Range
Canon RF 10-20mm F4 L IS STM has a focal range of 10-20mm and 2.0X zoom ratio. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 15 - 30mm.
Weather Sealings
The Canon RF 10-20mm F4 L IS STM is a weather-sealed lens, which provides extra protection to prevent water and dust get inside the lens and camera body under light rain, snow and wind. In order to have effective protection, you have to pair the Canon RF 10-20mm F4 L IS STM with a weather-sealed camera body such as the Canon R8, Canon R6 II and Canon R7.
Optical Image Stabilization
The Canon RF 10-20mm F4 L IS STM features an optical image stabilization system which helps to reduce the blur that occurs due to shaking during hand-held shooting. Canon RF 10-20mm F4 L IS STM's stabilization system is effective up to 5.0 stops.
Canon RF 10-20mm F4 L IS STM also has a Stabilization On/Off switch on the lens body so you don't need to delve into your cameras menu to disable or enable the IS.
Zoom Method
Canon RF 10-20mm F4 L IS STM features Rotary (internal) zoom method where the length of the lens doesn't change while you are zooming in or out. Even though this design has a size disadvantage in general compared to extending designs, it has the benefits of better sealing against dust and moisture, no zoom creep and no weight balance shift while zooming.
Maximum Magnification Ratio
Canon RF 10-20mm F4 L IS STM has a Max Magnification Ratio of 0.12x and has a minimum focusing distance of 0.25m. 0.12x means that the max magnification ratio is very low and not suitable even for modest close-up shots.
Below are the 3 Ultra-Wideangle Zoom type Canon RF mount lens alternatives with highest max magnification ratios:
Aperture
Canon RF 10-20mm F4 L IS STM is a fixed aperture lens with a constant max aperture of f4 from 10mm all the way to the 20mm .
| Focal Length |
Max Aperture |
Min Aperture |
|
10mm
|
F4 |
F22 |
|
20mm
|
F4 |
F22 |
Optical Formula
Canon RF 10-20mm F4 L IS STM's optical formula consists of 16 elements in 12 groups . Following special elements are used in this design:
- 1 Super UD
- 3 UD
- 3 aspherical
Body Colour
Canon RF 10-20mm F4 L IS STM is available in Black color.
![https://cameradecision.com/lenses/img/other/Canon-RF-10-20mm-F4-L-IS-STM-withcamera.jpg]()
Canon RF 10-20mm F4 L IS STM Attached to a camera
Popular Comparisons of Canon RF 10-20mm F4 L IS STM
Here are the eight most popular comparisons of the Canon RF 10-20mm F4 L IS STM amongst Camera Decision readers.
Top Alternatives of Canon RF 10-20mm F4 L IS STM Lens
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