The Canon RF 16mm f/2.8 STM (Amazon, B&H) is primarily a photography lens, though it will be used for video.
In this article let’s take a comprehensive look at the important features and specifications of the Canon RF 35mm f/1.8 IS Macro STM and see how good it will perform specifically for video, cinematography and filmmaking.
The aim of this article is to provide you with enough information and perspective so you can decide for yourself whether this lens is right for your film or video.
Important: This article is a comprehensive overview of the lens with available information; and an analysis based on our experience shooting for almost two decades. It is not a hands-on review. If and when we get hold of the lens we’ll be sure to publish a detailed review. If this is not your cup of tea you can stop reading.
Click to what you want quickly:
- TLDR;
- EF vs RF:
- Features:
- Control:
- Basics:
- Alternatives to the RF 16mm f/2.8 STM
TLDR;
What you need to know for video work about the Canon RF 16mm f/2.8 STM (Amazon, B&H):
- The Canon RF 16mm f/2.8 STM is a wide lens.
- You get what you pay for. It isn’t that sharp, and the fall-off is steep at f/1.8. Should be great at f/2.8, though.
- The f/2.8 aperture is good for low light video work.
- 7-blade aperture for a theoretically soft bokeh.
- Focus ring can be changed to fly-by-wire for follow focus work.
- Control ring can be de-clicked for a small fee at a Canon service center for aperture transitions.
- You can change the focus ring to be the control ring and vice versa.
- The lens does not have Image Stabilization, but you will get some added stabilization with a Canon R camera (R5, R6, etc.) that has IBIS.
- Great for dual pixel autofocus for video.
- It exhibits breathing.
Can be great for the following types of filmmaking:
- Wedding filmmaking
- Low budget music videos
- Gimbal use
- Product filmmaking
- Fashion filmmaking
- Low budget commercials and corporate videos
EF vs RF: What’s the difference?
Difference between the RF and EF mount
Both are lens mounts specific to Canon. Let’s take a look at some important distinctions.
Flange focal distance
The RF is a new lens mount, with a smaller flange focal distance.
Here’s how the flange focal distance compares:
| Mount | Flange Focal Distance |
|---|---|
| RF | 20mm |
| EF | 44mm |
EF lenses were designed for DSLRs. Now with the mirror gone, that’s space and weight savings. However, that’s not the only advantage.
Canon (and every one else) maintains the smaller flange focal distance allows for larger apertures (for some focal lengths), better corner to corner sharpness and reduced light fall off.
Ergonomics
RF lenses are supposed to be lighter, making them easier to handle for photography, but slightly problematic for video. The weight gives better stability and smoother movement for most use cases. For gimbal, drone and Steadicam use, the lower weight is an advantage because a lighter lens puts less strain on motors and the human arms that have to hold it up.
The RF mount is equipped with 12 communicator pins compared to 8 pin connection of the EF mount. Canon claims this contributes towards quicker autofocus, better AF tracking and improved image stabilization.
Canon has redesigned the focus actuators for hassle-free filming. They claim the new Nano USM and Dual Nano USM have been designed for video. Canon claims that the introduction of these actuators in RF lenses will result in quieter and quicker autofocus.
The last major change is in the optics. Canon has redesigned the optics from the ground up to account for the smaller flange focal distance. This one simple change considerably changes the optical characteristics and challenges.
Naturally, the prices of RF lenses match the high-quality Canon have put into these series! The assurance is, the quality isn’t compromised, and with proper care, Canon RF lenses should last for years.
Features
Coverage
The Canon RF 16mm f/2.8 STM (Amazon, B&H) is a full-frame lens. It is designed to completely cover a sensor the size of 36mm x 24mm.
If you are considering this lens for an APS-C sensor or another cinema camera, check out this article:
Focal Length
The focal length is 16mm. This is considered a wide lens on a full frame 35mm sensor.
Aperture
The maximum aperture is f/2.8 and the minimum aperture is f/22. It is great for low light and a smooth bokeh.
The Canon RF 16mm f/2.8 STM (Amazon, B&H) has 7 rounded diaphragm blades. That should be enough for most people.
If you want more blades, you might want to take a look at the Canon Sumire primes.
Resolution
From Canon’s official MTF charts:
The Canon RF 16mm f/2.8 STM (Amazon, B&H) isn’t razor sharp in the center. The fall-off is steep, and this explains the price point. It’s an underwhelming performance at f/2.8 (I’m assuming the MTF chart is at f/2.8). Things should get better at f/3.5. But at this point, why not just stick to your 18-55mm?
With the variance in the Sagittal and Tangential lines, you can infer (somewhat) that the bokeh won’t be as smooth at f/2.8 so you might want to shoot some tests before you commit.
If you are curious and want to read the MTF chart for yourself. Here’s a guide on how to read them easily.
Close Focus
The closest focusing distance is 0.13 meters or 0.45 feet. This is great, you can get close to your subject.
Image Stabilization
The Canon RF 16mm f/2.8 STM (Amazon, B&H) lens does not have IS. Another disappointment.
Control
Manual focus system
By default, the Canon RF 16mm f/2.8 STM (Amazon, B&H) is set to ‘fly by wire’.
Even though the Canon RF focus ring is technically a ‘focus by wire’ system, the RF lenses are the first line of lenses in the world which have enabled turning focus by wire off.
What is the meaning of focus by wire and fly by wire?
Focus by wire: Let’s say you turn the focus ring to change focus from point A to B. You’d expect the focus to shift accordingly. When you stop point B will be in focus. Now bring the focus point back to A and try again, but at a different speed. Slower or faster, doesn’t matter. Now, even if you precisely rotate to the exact same degree, the focus will not be on point B! The speed of rotation determines which point it is focused on. That’s just completely useless for follow focus work. If an actor or person moves at a different speed, evens lightly, you’ll never get the same focus. Avoid focus by wire lenses like the plague (for video work).
Fly by wire: The distance of focus shifted is directly proportional to the speed at which the ring is turned. This is how a manual focus ring is supposed to operate for video and cinematography.
How to change to fly by wire on RF lenses
You can switch to ‘link to rotational degree’ where the focusing distance will be directly proportional to the rotational degree regardless of the rotational speed.
It is a quick two-step affair that requires you going into the Canon menu and switching the RF manual focus ring sensitivity to ‘linked to rotational degree’ instead of ‘varies with rotational speed’.
This feature will be exceptionally useful for anyone who wants absolute control over the focus ring.
This feature makes an RF lens a game changer for many videographers, filmmakers and cinematographers.
Autofocus system
Dual Pixel Autofocus is, without a doubt, one of the most revered video autofocus systems in the world. Canon claims the new AF actuators will help focusing to be smooth and phantom-quiet.
Canon claims that the RF 16mm f/2.8 STM has silent STM motors for natural focus transitions but we can only know what it translates to once we test this in the field.
The dual pixel AF system works better (in theory) than original EF lenses on native EF bodies. I don’t think anyone will be disappointed with its performance.
Control System
Canon RF lenses come with an extra customizable ring. However, with this lens, Canon has only given us a single ring with a switch. I believe this has been done to save space and make the lens smaller. See the photo above. Now, you can use the switch to either use the ring as a focus ring or you can switch it to control and control the other elements of exposure.
This ring is only customizable with cameras that have a native RF mount, such as the Canon EOS R5/6 and Canon EOS C70.
To toggle the Control Ring on, set the Switch to control and customize it to control one of the exposure determinants, follow these steps:
- Go into Settings
- Go to the Customize dials option
- Select Control Ring and switch it to Enabled.
- Now you can customize it to control aperture, shutter speed, ISO and exposure compensation.
Some videographers will find it helpful in riding the aperture due to its favorable placement right on the lens close to the focus and zoom ring.
Although the turn of the ring appears to be smooth, there is a soft clicking sound. Some might find it inconvenient. If you want to remove the sound you can.
The clicking of the control ring on every RF lens is removable through a chargeable service fee of about $79.99 (depending on your country) at your nearest Canon service center.
Basics
Filter Thread
The Canon RF 16mm f/2.8 STM (Amazon, B&H) has a filter thread diameter of 43mm. This is an uncommon filter size. You might face some issues, finding the right filter.
Build Quality
The majority of the lens exterior is plastic, though the lens doesn’t feel cheap.
The optical design consists of 7 elements in 9 groups.
Size and Weight
The Canon RF 16mm f/2.8 STM (Amazon, B&H) has a diameter of 69.2 mm and a length of 40.2 mm. It weighs about 165 grams, which makes it one of the most compact wide-angle lenses in the RF pantheon.
Weather resistance
Canon claims that all RF lenses are weather sealed. But again this only holds true if the camera body you will be using is also weather sealed. No camera is truly and officially weather-sealed, so the best you can hope for is reliable weather resistance.
However, it will be beneficial to keep in mind the fact that the 16mm f/2.8 STM is not an L series lens and does not come with the same quality (and the price tag).
What’s in the box
This is what you get in the box (other than the lens):
- Lens Cap – EF-43
- Lens Hood – EW-65C
- Lens Case/Pouch – LP1014
- Rear End Cap – Lens Dust Cap RF
The hood might be useful for photography, but the shape and design makes it mostly vestigial for video work. Some people like to put it on to protect the front element in case of a fall. The hood takes the impact and shatters, but saves the lens.
Alternatives to the Canon RF 16mm f/2.8 STM Lens
There is no proper alternative to the Canon RF 16mm f/2.8 STM. It stands unique in the Canon RF lineup.
I hope you found this overview of the Canon RF 16mm f/2.8 STM (Amazon, B&H) useful. If we have missed out on something, please let us know in the comments below.
