A look at the Canon RF-S 10-18mm f/4.5-6.3 IS STM MTF

The Canon RF-S 10-18 f/4.5-6.3 IS STM has arrived and issued in the era finally where we can look at the RF-S system as a “system” and not just APS-C Camera bodies with a couple of kit lenses.

When the EOS-M first came out, the EF-M 11-22mm was “the” lens that got me interested in the system and I wasn’t alone in that regard. I suspect that Canon is hoping for the same with the RF-S 10-18mm. Of course, I was immediately curious about how this lens looks compared to its competitor, the EF-S 10-18mm which can be also used on the RF-S camera bodies.

I think the first thing we have to look at is just how small this lens is, especially when compared to the EF-S 10-18mm, which is the only APS-C UWA Zoom available up to now for the RF-S mount. This sizing is approximate. However, it makes it obvious to which lens is better as a general walkaround ultra-wide lens for the RF-S mount. No questions at all about this.

image 728x468 - A look at the Canon RF-S 10-18mm f/4.5-6.3 IS STM MTF

Special thanks to www.camerasize.com for the original RF 10-18mm f/4.5-6.3 IS STM images, and the EF-S 10-18mm. At the time of this writing, they didn’t have the RF-S 10-18mm in their database yet.

Now we could probably just end this article right here, but hey, we have to look at the MTFs because that’s just the kind of camera nerd I am. As I mentioned in other places, lens designers are always faced with 3 priorities; size/weight, cost, and optical quality. All three priorities are ones in which the designers have to balance for a lens.

In this lens, we have an extremely small lens, that is inexpensive and when we look at the MTF we see good image quality, equally as good as the EF-S counterpart. I’d suggest that the resolution is even slightly better in the corners at the business end of the lens, 10mm, with the RF-S lens and also the resolution falloff is much more natural with the RF-S lens.

That’s just insanely great, and a testament to how designers have far more flexibility with mirrorless camera mounts than they did with the SLR EF mount.

image 1 - A look at the Canon RF-S 10-18mm f/4.5-6.3 IS STM MTF

If you were happy with the EF-S 10-18 IS STM, then you will be equally as happy if not more so because of the extremely small size of the RF-S 10-18mm. This lens will be a homerun hit for Canon.

If you are an UWA bigot like me, and always looking for the bang for the buck lenses, this is it. Get it quickly because it’s bound to be stuck on backorder.

Preorder the Canon RF-S 10-18mm f/4.5-6.3 IS STM

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