So, first of all. 24 f/2.8 STM and 28mm f/1.8 are wildly different focal lengths. The 24 is an EF-S lens, while the 28 is a EF lens. Since your gear list shows that you have a 70D, you have to think that your camera has a crop factor.
Canon EF-S 24mm f/2.8 STM. Where to Buy. Buy now at Amazon. The Best Right Now The Best Canon Lenses. Read more. review Small and affordable, the Canon 24mm f/2.8Canon RF 28mm f2.8 STM review so far; Zhongyi Mitakon Speedmaster 85mm f1.2 review; Canon RF 100-300mm f2.8L IS USM review so far; Canon RF 24mm f1.8 STM review; Canon RF 100mm f2.8L Macro IS USM review; Canon RF 14-35mm f4L IS USM review; Canon RF 100-400mm f5.6-8 review; Canon RF 16mm f2.8 STM review; Canon RF 5.2mm f2.8L Dual Fisheye
The Canon RF 28mm f/2.8 STM produces a heavy (4.1%), albeit not excessive, degree of barrel distortion in RAW images. As usual, auto-correction reduces the issue to a negligible degree. If you choose JPEG-only output, you can't even disable auto-correction in the camera. 28mm (corrected)
Extreme corner sharpness isn’t quite as good at maximum aperture as it is on Canon’s EF-S 24mm f/2.8 STM – an extremely similar lens – and the manual focus ring is arguably a little thinner than is comfortable, but otherwise most aspects of this lens are very strong indeed.
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The Canon EF-S 24mm f/2.8 STM is an impressive lens that is small in size and low in price, making it appealing for many photographers. It has a full frame equivalent of 38mm when mounted on a Canon EOS R7 camera, and its autofocus speed is fast, reliable and quiet thanks to its STM motor. Its build is also beautifully made with a metallic lens mount. The lens has quite good sharpness
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