Nikon's Tactical Fieldscope TF3 is a waterproof, fogproof and shockproof spotter that delivers the ideal degree of optical performance and flexibility. Compatible with all Nikon Fieldscope eyepieces, the Tactical Fieldscope TF3 comes in a straight body with sliding sunshade and ED (Extra-low Dispersion) glass for the utmost in edge to edge sharpness and detail resolution. The Tactical Fieldscope TF3 includes a straight body and a 20-45x zoom eyepiece.