18 mm eye cup compatible with Canon EOS Digital Rebel series Compatibility - Fits Canon EOS Digital Rebel and related models including 300D, 350D, 400D, 450D, 500D, 550D, 600D, 1000D, 1100D, 700D, 100D, as well as Digital Rebel XS, T2i, T3i, T4i, T5i and SL1 What it does - An 18 mm eye cup designed to prevent light from entering the viewfinder - Helps reduce light leaks during shutter operations and long exposures - A practical accessory to enhance image capture in a variety of shooting conditions Protection and viewing comfort - Protects the eyepiece from direct exposure and keeps stray light away from the viewfinder - Helps maintain a clean and clearer viewing experience, contributing to more accurate composition Key attributes - Function: blocks light intrusion, protects the eyepiece - Compatibility: specified Canon EOS Digital Rebel and related models - Size: 18 mm eye cup - Performance: lightweight, simple to use, reliable for everyday photography Use scenarios - Long exposure and night photography (astro, landscape) where stray light can affect exposure - Outdoor shooting in bright conditions to minimize light leakage into the viewfinder - Studio or tripod-based shoots where consistent viewfinder visibility improves framing and focus This eye cup provides a straightforward upgrade to improve light control, protection, and viewing comfort for compatible Canon EOS Digital Rebel models.