Highlights Fixed folding rubber eye cup allows easy use with or without eyewear Eyepiece body is made of aluminum. A two-step anodizing process results in a beautiful matte finish that resists reflections and glare Sturdy anodized aluminum barrels are threaded for any 1.25" filters The edges of the optics are blackened for increased contrast, and prevent internal reflections Anti-reflection fully multi-coated optics ensure bright and clear high-images at any magnification, with true color rendition Specifications Model SV113(F9184A) SV113(F9184B) SV113(F9184C) SV113(F9184D) Focal Length 9mm 12mm 16mm 20mm Barrel Size 1.25" 1.25" 1.25" 1.25" Apparent Field of View 60° 60° 65° 65° Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6) 1.25" Filter Thread (M28.5 x 0.6) 1.25" Filter Thread (M28.5 x 0.6) 1.25" Filter Thread (M28.5 x 0.6) Coatings Fully Multi-Coated Fully Multi-Coated Fully Multi-Coated Fully Multi-Coated Lens Elements 4 4 4 4 Rubber Eye Guard Yes Yes Yes Yes Weight 120g 135g 150g 150g