Professional wide angle zoom lenses tend to have apertures of f/2.8, but for photographers who do not need that extra light-gathering power, choosing an f/4 zoom can mean significant savings in both weight and cost (and sometimes other gains). For Canon shooters, there is the RF 14-35mm f/4L IS USM, and this great video review takes a look at the kind of performance and image quality you can expect from it in practice.
[ Read More ](Originally posted by Alex Cooke)