Having recently reviewed both the Voigtländer 40mm f/1.2 and the Canon RF 45mm f/1.2 STM, I thought it would be a fun and very relevant comparison.  On paper, these two lenses look like they should be direct competitors.  They share a very similar focal length, the same fast f/1.2 aperture, and both come in under the $1000 mark.  They’re also both compact and relatively lightweight options in a world where most f/1.2 lenses feel like you’re carrying a brick around your neck.

But once you actually start shooting with them, it becomes clear very quickly that these lenses may look similar on a spec sheet—but they are built on completely different philosophies.

Key Specs at a Glance

Canon RF 45mm f/1.2 STM

• Price: ~$469 USD
• Weight: ~346g / 0.76 lb
• Size: ~78 x 75mm
• Autofocus: Yes (STM)
• Build: Engineered plastics, no weather sealing

Voigtländer 40mm f/1.2 Nokton (RF Mount)

• Price: ~$799–$899 USD
• Weight: ~420g / 0.93 lb
• Size: ~70 x 54mm
• Autofocus: No (Manual Focus Only)
• Build: Full metal construction

Size, Weight, and First Impressions

Both lenses fall into the “small and light” category—especially when compared to traditional f/1.2 glass—but they get there in very different ways.

The Canon RF 45mm is light because it’s built that way. Canon clearly prioritized portability and affordability, using lighter materials and a more simplified design. It’s the kind of lens you can leave on your camera all day and barely notice.

The Voigtländer 40mm, on the other hand, is physically smaller—about half the length—but actually weighs a bit more. That weight comes from its all-metal construction, and you feel it immediately. It’s dense, solid, and undeniably premium in the hand. Where the Canon feels practical, the Voigtländer feels…intentional – a very overused word in the photography world right now, I know.  But true nonetheless.

Autofocus vs Manual Focus: A Real Divide

This is the biggest philosophical difference between the two lenses.

The Canon RF 45mm offers full autofocus with an STM (stepping motor), and it performs exactly how you’d expect on modern Canon bodies—fast, smooth, and reliable. For many shooters, especially beginners or those coming from smartphone photography, that’s going to be the safer and more familiar choice.

The Voigtländer 40mm is manual focus only.  For a purely entry-level shooter, that may feel like a dealbreaker. But in reality, Canon has done an exceptional job making manual focus not just usable—but enjoyable.  Focus peaking, magnification assist, and other tools built into Canon’s mirrorless system make it very easy to learn and very easy to use effectively.

And for more experienced photographers, that manual focus experience isn’t a limitation – it’s a breath of fresh air.  An opportunity to slow down.  To be more…intentional (there’s that word again).  Manual focus lenses change how you shoot.  It’s an experience many photographer crave.  I personally enjoy the experience and find myself shooting with manually lenses more often than not.

Build Quality and Shooting Experience

There’s no real competition here.  The Voigtländer is the more premium lens—both in build and in experience.  The focus ring is beautifully damped, the metal construction feels like it could last decades, and every interaction with the lens feels deliberate.

The Canon, by comparison, is more of a utilitarian tool. It’s functional, lightweight, and efficient. It doesn’t get in your way—but it also doesn’t add much to the shooting experience itself.  That’s not a criticism.  It’s a design choice.  The Canon is built to get the shot.  The Voigtländer is built to make you enjoy taking it.

Focal Length: A Subtle but Real Difference

On paper, 40mm vs 45mm doesn’t sound like much. In practice, it matters more than you might expect.  Personally, I tend to gravitate toward a 35mm field of view more than 50mm.  It gives just a bit more breathing room—especially in tighter environments.  For example, when shooting car shows, where composition flexibility can make a big difference, I much prefer the 40mm field of view as compared to the 45mm.  With the Canon 45mm, I found myself occasionally feeling just a bit constrained. That extra tightness showed up in real-world situations—especially when I didn’t have the option to physically move.  Again, in tight car show parking areas, sometimes you can only back up so much.  The Voigtländer just worked much better in those situations.  Small difference on paper.  Big difference in actual use.

Image Rendering: Where These Lenses Truly Separate

This is where the comparison gets interesting—and where your choice will likely be made.

Voigtländer 40mm f/1.2 Nokton

The Voigtländer has a rendering style that is immediately recognizable.

• Beautiful tonal transitions
• Slight softness wide open that adds character
• Strong sense of depth and separation

Chromatic aberration does appear from time to time, but it’s relatively minor and rarely distracting. It’s the kind of imperfection that feels natural rather than problematic.

Vignetting is more prominent at f/1.2—but very easily corrected in post. Personally, I rarely correct it. In fact, I often add vignette in post anyway, so the natural falloff from the lens works in my favor.  The one area where the Voigtländer does struggle a bit is highlight control. It has a tendency to clip highlights, particularly in high-contrast scenes. It’s something you learn to manage with exposure, but it’s definitely there.

 

Canon RF 45mm f/1.2 STM

The Canon takes a more modern, controlled approach.

• Cleaner, more predictable rendering
• Less vignetting wide open
• Better highlight roll-off

Images feel more “correct” out of the camera. The falloff is gentle, and the overall look is more refined in a technical sense.  However, the biggest issue with the Canon is longitudinal chromatic aberration (LoCA).  In high-contrast situations—especially when shooting wide open—it can be significant. Purple and green fringing show up clearly and can be difficult and time-consuming to correct in post.

For my style of photography, which often includes cars, this becomes a real concern. Automotive photography is one of the fastest ways to expose LoCA issues, thanks to reflective surfaces, chrome trim, and harsh lighting conditions.  If a lens struggles with LoCA, car photography will find it.

And the Canon struggles more here than the Voigtländer.  So it’s not a question of which lens is better—it’s a question of which flaws are you more willing to work with?

 

One of the more subtle—but meaningful—differences in image rendering between these two lenses comes down to aperture blade design.  The Voigtländer 40mm f/1.2 Nokton uses a 10-blade aperture, while the Canon RF 45mm f/1.2 STM uses 9 rounded blades.  On paper, that may seem like a minor distinction, but in practice it has a noticeable impact on both bokeh rendering and how each lens handles point light sources.

From a bokeh standpoint, more aperture blades generally help maintain a more circular aperture shape as you stop down. The Voigtländer benefits from this, producing bokeh balls that feel a bit more round and organic. The Canon’s 9 rounded blades still do a good job here, but the background blue rendering can feel slightly more structured or “digital” in comparison—particularly in busier backgrounds.  The “bokeh balls” the Canon produces are less consistently round and more “cats eye” in shape.

Where the difference becomes more obvious—and frankly more interesting—is in how each lens renders sun stars. Aperture blades directly influence the number and character of the rays produced when shooting point light sources at smaller apertures. The Voigtländer’s 10-blade design produces clean, well-defined 10-point sun stars that are both sharp and aesthetically pleasing. When stopped down to around f/8 or f/11, it creates that classic, almost cinematic starburst effect that many photographers actively seek out.

The Canon, with its 9-blade aperture, produces 18-point sun stars (a result of odd-numbered blade counts doubling the number of rays). While technically interesting, they tend to be a bit less defined and not quite as visually striking as what the Voigtländer produces. Combined with its more modern rendering style, the effect feels more subdued.

Price and Value

The Canon RF 45mm is undeniably the more budget-friendly option. At under $469.00, it delivers a lot of performance for the price—especially considering the f/1.2 aperture and autofocus.

The Voigtländer 40mm, while still well under $1000, is clearly positioned as a more premium product at about $750.00. You’re paying for build quality, experience, and a distinct rendering style.  Yes, you’re paying nearly twice the price for the Voigtländer…and losing autofocus capability in the process.

Final Thoughts: Which Did I Choose?

For me, this ultimately came down to two things:

1. Focal length preference
2. Rendering characteristics

I found the 40mm focal length more usable in real-world scenarios for how I shoot, and I preferred the way the Voigtländer renders images. It feels more natural to me, easier to work with in post, and more aligned with the kind of photography I enjoy.

As much as I appreciate the convenience of autofocus on the Canon—and it absolutely has its place—I found myself reaching for the Voigtländer more often.  I typically shoot with two different camera bodies, with an autofocus zoom on one, and a manual prime like the Voigtländer on the other.  So I kept the Voigtländer lens and returned the Canon.

These lenses are not direct competitors in the traditional sense.  They may share some similar specs, but they serve very different photographers:

• The Canon RF 45mm f/1.2 STM is a practical, affordable tool that delivers strong performance with minimal effort.
• The Voigtländer 40mm f/1.2 Nokton is a premium, manual lens that rewards intention and delivers a more distinctive image.

If you want ease, speed, and value—go Canon.  If you want experience, character, and control—go Voigtländer.  Neither is wrong.  But they are very different answers to the same question.