24mm = 3.17' 28mm = 3.51' 35mm = 1325mm 50mm = 1844mm 70mm = 2471mm : Review: Canon EF 24-70mm f/2.8L USM Lens : » Canon EF-S 18-135mm f/3.5-5.6 IS STM Lens EF 50mm f/1.8 STM. Affordable STM lens, with a fast f/1.8 aperture for general, low light and portrait photography. An affordable, high quality lens that’s perfect for creative portraits and low-light photos. Blur backgrounds to make your subject stand out, and enjoy smooth near-silent STM focusing when shooting movies. The EF-S 24mm f/2.8 STM delivers a lot of bang for the bucks, selling at $149. Canon’s little EF-S 24mm f/2.8 STM is an incredible little weapon for your APS-C (crop sensor) arsenal. It is less than inch long but is one of Canon’s sharpest EF-S lenses (second only to the excellent EF-S 60mm f/2.8 1:1 Macro lens). Conclusion. Canon continues to expand its range of RF full-frame mirrorless lenses with more affordable options, the latest being the new RF 24mm F1.8 MACRO IS STM wide-angle prime. Following in the design footsteps of the Canon RF 35mm f/1.8 IS Macro STM which was released just under 4 years ago, the very similar 24mm version offers virtually 3nDJ.