Canon's RF-S series, meant for APS-C mirrorless bodies, is filled with affordable optics – but will the series offer a constant aperture zoom in the future? That's the idea floating around the latest Canon lens rumors.
If the rumors are true, then Canon could be about to treat its EOS R APS-C community to a do-it-all lens featuring not only a versatile focal length range, but also a constant aperture that verges on fast-glass capabilities at the maximum zoom length.
According to Canon Rumors, an unnamed source has said that the forthcoming lens is the RF-S 15-70mm F4 IS STM, which first came to public attention back in 2023 when the design was revealed in patent number P2023057875 – published on the Japan Patent Office platform.
While generous on the wide-angle end, you might be thinking that 70mm hardly embodies an all-rounder focal length. But, taking the RF-S crop factor into consideration, and you’ve got a 24-105mm full-frame equivalent lens.
Now factor in the constant f/4 aperture, and suddenly this lens becomes a very attractive prospect, boasting versatility not seen in the likes of Canon’s existing RF-S telephoto zoom lenses like the RF-S 55-210mm F5-7.1 IS STM and RF-S 18-150mm F3.5-6.3 IS STM.
While Canon Rumors didn’t state an announcement date for the rumored RF-S 15-70mm F4 IS STM, it’s speculated that it will be released alongside the equally-rumored Canon EOS R7 II camera, which rumor sites have heavily touted for release this summer.
The word is that the EOS R7 II is going to be geared towards ‘prosumer’ APS-C photographers, and my colleague, Peter Travers, thinks it may even feature a BSI (Back-Side Illuminated) sensor in the region of 40MP.
Dare I say that the suspected 15-70mm f/4 STM could even be a kit lens for the rumored EOS R7 II in a bid to capture a healthy amount of the prosumer market?
With nothing confirmed by Canon, as yet, we’ll have to wait for more information. Regardless, it’s exciting times for Canon fans who could be getting a long-awaited piece of kit.
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