TECHSPEC® Rod Lenses are polished on the circumference and ground on both ends. Optical performance is similar to a cylinder lens. Collimated light passing through the diameter of the rod lens will be focused into a line. TECHSPEC ® Rod Lenses are offered in diameters ranging from 1mm to 10mm. N-BK7 and UV Fused Silica substrates are available for a variety of UV, Visible and NIR applications.