Mitakon 24mm f/1.7 (Sony E) Standard-Prime Lens for Sony Nex E Mount Mirrorless Cameras Prime wide angle lens designed for APS-C mirror less camera users with landscape-shooting need. Feature a fast f/1.7 aperture for shooting in low-light condition Compact size (55mm x 61.5mm) and light-weight (246g) make it perfect for mirror less camera users.