The Canon RF 20mm f/1.4L VCM is an intriguing lens for photographers who want a wide field of view without sacrificing aperture. Its f/1.4 maximum aperture makes it particularly appealing for astrophotography, while the 20mm focal length offers plenty of room for landscapes, architecture and other wide-view scenes.We took the lens out to the dark skies of Wales to photograph the night sky and the Perseids, giving it a real-world test in some of the best conditions we could find. With a premium L-series build and a price tag to match, there's a lot to consider before adding this lens to your kit. We wanted to find out how it actually performs in the real world, and whether it's worth the inve...