The Canon EF-S 35mm f/2.8 Macro IS STM lens is the first of its kind in the EF-S range. For use with Canon’s APS-C sensor cameras, the lens features a unique built-in Macro Lite technology to illuminate close-up subjects. As it’s a dedicated macro lens, it has a 1.0x magnification, with a close focusing range of just 0.13 metres.
The EF-S 24mm f/2.8 STM sees Canon trying to replicate this winning formula, only now for APS-C shooters. With its 38mm equivalent focal length, the EF-S 24mm f/2.8 gives a natural, undistorted perspective to images. Offering a 38mm (equivalent) angle of view, this focal length may seem like a slightly odd choice for APS-C.
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 Optical properties. On Canon crop cameras, the EF-S 24 / 2.8 STM is a moderate wide or, rather, a universal staffer, with EGF 38 mm. Unlike full-frame 24mm lenses, the Canon EF-S 24/2.8 STM has a much less asymmetric optical design, which reduces field aberrations. In addition, the correction of optical distortion provides an aspherical rear
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.
The Canon EF-S 24mm f/2.8 STM has a maximum aperture of f/2.8 which lets in quite a bit of light. Its minimum aperture is f/22. Canon says that its “aperture mechanism uses micro-stepping drive control for quieter drive”, which should benefit videographers who use auto exposure modes while shooting video. 0cmS5.
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    • canon efs 24mm f 2.8 stm review