Conclusion
Pros:
- Exceptionally compact and lightweight for an ultra-wide full-frame autofocus lens
- Well constructed
- Good sharpness over most of the frame throughout the aperture range
- Excellent color and contrast
- Quick and accurate autofocus
- Very affordable
Cons:
- Extremely high native distortion that requires digital correction
- Edge and corner sharpness suffer after distortion correction
- Moderate lateral chromatic aberration and high purple fringing
- Moderate to high vignetting
- No lens hood included
The RF 16mm f/2.8 is a lens about compromise. It trades supreme optical quality for a low price and a truly tiny form factor, and I think Canon has done a wonderful job with these compromises. The lens is one of the most affordable ultra-wide lenses available for full-frame cameras, and it is ultimately still a relatively competent optic.
The biggest optical flaw is in the form of truly dramatic complex barrel distortion, which will require digital correction when shooting anything man-made. This high level of distortion ultimately affects image sharpness, as corrected images will stretch the edges and corners to a degree that degrades resolution. There is also moderate vignetting and a fair bit of chromatic aberration.
However, the lens manages to produce good resolution over most of the frame, and even into the corners when shooting landscapes where distortion correction isn’t always needed. The lens also renders the scene with excellent color and contrast and even has decent bokeh when shooting close up. But the real story here is the size and the price. The 16mm f/2.8 STM is compact and light enough to toss in a jacket pocket, and gives a true ultra-wide field of view for full-frame cameras for only $299. When you consider the entire package, it’s really a great bargain.
I want to also talk personally for a bit. Canon has now released 24 RF mount lenses, of which 9 fall into their consumer grade line with the pewter front ring. While the L-series RF lenses are exceptional performers (and my RF 70-200mm f/2.8L IS is among my favorite lenses I’ve ever owned), the 9 consumer-grade RF lenses have gotten me excited. Most of these lenses have something a little different going on from the typical camera lens. The RF 35mm f/1.8 and 85mm f/2 don’t have the fastest focus motors, but they provide exceptional versatility, with a 0.5x macro capability in addition to their more standard uses. The RF 600mm and 800mm f/11 are slow, but they also bring exceptional reach in a very compact package for under $1,000. The new RF 100-400mm (which I’ll be reviewing soon), is extremely small and light for a 400mm zoom lens, and is also very affordable while having surprisingly good optics. Finally, this RF 16mm f/2.8 is just a little pocket wonder that is cheap, good and fun.
I really enjoy the RF 16mm f/2.8. Its compact nature and ‘good enough’ image quality make it so that this is the ultra-wide lens that ends up in my bag more often than not for day to day use. If I’m going out for a serious shoot, or for professional work, I’ll bring my outstanding Sigma 14-24mm f/2.8, but for everyday shooting, I just drop the little 16mm into my bag or pocket.
Image Samples
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Best value for the money, outperforms a much more expensive lens i bought years ago.Heavy barrel distortions are corrected by camera software.Hyperfocal distance is easy to achieve by manual tuning.
An easy to use lens for all purposes
Great review.
I have this lens and r5/r8. I do lots of backpacking for landscape. This (16mm) lens plus canon RF 24-105 STM lens and R8 is a fantastic package – light and capable when every gram counts. [ I also have the RF 15-30 STM but it weighs 200grams more.] Sometimes when the trail is short or elevation gain is small, I use same and replace r8 with R5 and sometimes I bring the 15-30 instead of the 16 if I can afford the weight. On the R5, you can use the 16mm as your walk about lens in APSC mode at 24mm with IBIS.
I agree that where it shines is when you don’t need to correct the barrel distortion – eg landscape without super straight objects. For landscape the barrel distortion is sufficient especially because at 16mm, your struggles will not be the edges but keeping level to not have bowed trees. I am more tempted to bring a 15mm shift lens than an better Iq lens.
In short, if you are a canon backpacker, this is the uwa lens you ought to have for travel and backpacking.