Canon RF 100-300mm f/2.8 L IS USM Lens
The Canon RF 100-300mm f/2.8 L IS USM is a 100–300mm f/2.8 lens designed for Canon RF mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Canon RF 100-300mm f/2.8 L IS USM Lens
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Lens Overview — Canon RF 100-300mm f/2.8 L IS USM
Key Features — Canon RF 100-300mm f/2.8 L IS USM
100-300mm f/2.8 Constant Aperture: Maintains a maximum aperture of f/2.8 throughout the entire zoom range, a rare engineering feat at this focal length that delivers consistent exposure and depth-of-field control without adjusting settings as you zoom.
Full-Frame RF Mount: Designed natively for Canon's RF mirrorless system, covering the full 35mm sensor area of cameras like the EOS R3, R5, and R1.
Optical Image Stabilization: Built-in optical IS helps reduce camera shake when handholding at longer focal lengths, particularly useful for sports and wildlife shooting without a tripod.
Dual AF/MF Operation: Supports both autofocus and manual focus modes, with Canon's high-speed USM autofocus system suited to tracking fast-moving subjects.
L-Series Build Quality: Canon's professional L-Series designation indicates a weather-sealed, dust- and moisture-resistant construction built for demanding shooting environments.
112mm Filter Thread: The large 112mm front filter thread accommodates the oversized front element required to sustain f/2.8 at 300mm on a full-frame sensor.
Lens Specifications — Canon RF 100-300mm f/2.8 L IS USM
| Spec | Detail |
|---|---|
| Use Cases | Sports, Wildlife, Portrait, Event |
| Lens Type | Zoom |
| Format | Full Frame |
| Zoom/Prime | Zoom |
| Focal Length | 100–300mm |
| Maximum Aperture | f/2.8 |
| Camera System | Mirrorless |
| Lens Mount | Canon RF |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | Optical |
| Filter Thread | 112mm |
Description — Canon RF 100-300mm f/2.8 L IS USM
The Canon RF 100-300mm f/2.8 L IS USM is a telephoto zoom lens designed for the Canon RF mirrorless system, covering a full-frame image format. It spans a focal length range of 100mm to 300mm while holding a constant maximum aperture of f/2.8 — delivering consistent light-gathering capability no matter where you set the zoom. Built-in optical image stabilization provides an additional tool for managing camera shake when shooting handheld at longer reach.
The lens supports both autofocus and manual focus, giving photographers the ability to switch modes based on the demands of the situation. A 112mm filter thread accommodates the large front element necessary to sustain f/2.8 performance at the telephoto end of the range. The lens weighs 2,650g, a figure that reflects the optical and mechanical complexity packed inside.
Whether you are working at 100mm or pushing out to 300mm, the constant f/2.8 aperture remains available, supported by autofocus and optical stabilization for demanding full-frame telephoto work on Canon RF cameras.
Pros — Canon RF 100-300mm f/2.8 L IS USM
- ✓Constant f/2.8 maximum aperture across the full 100-300mm zoom range
- ✓Covers the full-frame format, making full use of RF mirrorless sensors
- ✓Optical image stabilization helps manage camera shake when shooting handheld
Cons — Canon RF 100-300mm f/2.8 L IS USM
- ✗At 2,650g, the lens is very heavy and will require robust support for extended use
- ✗The 112mm filter thread means standard filters are expensive and harder to source
- ✗Limited to the Canon RF mount system with no native multi-mount compatibility
Videos — Canon RF 100-300mm f/2.8 L IS USM
Canon RF 100-300 2.8 REVIEW: NOT Worth $10,000 or a DREAM Lens?! — Jared Polin
Frequently Asked Questions — Canon RF 100-300mm f/2.8 L IS USM
What camera mount does this lens use?+
This lens is built exclusively for the Canon RF mount and is designed for Canon RF mirrorless cameras. It does not natively support other mounts.
Does this lens work with full-frame cameras?+
Yes, the lens is specified as a full-frame format lens, meaning it is designed to cover a full-frame image circle on Canon RF mirrorless bodies.
Is the aperture constant across the zoom range?+
Yes, the maximum aperture is f/2.8 and this is maintained across the entire 100-300mm focal length range. You will not experience aperture reduction as you zoom in.
Does this lens have image stabilization?+
Yes, the lens features optical image stabilization, which can help reduce the effects of camera shake during handheld shooting across the telephoto range.
What filter size does this lens accept?+
The filter thread diameter is 112mm. Filters of this size are less common and typically more expensive than smaller standard thread sizes.
How heavy is this lens?+
The lens weighs 2,650g. This is a significant consideration for handheld shooting, and most users will want to use a monopod or tripod for extended sessions.