Bi-concave lens element GCL-0104 series

BK7visible

Similar to plano- concave lenses, a bi-concave lens diverges parallel input rays and has a negative focal length. It has a virtual focus at the object side of the lens. Bi-concave lenses are usually suitable for absolute conjugate ratios closer to 1:1. • Focal Length (f'): ±2% at 587.6nm • Diameter(φ) Tolerance: +0.0/-0.20 • Center Thickness(Tc): ±0.1 • Centration: 3′ • Form Error: 1~5 fringes • Irregularity of Fringes: 0.2~0.5 fringes • Surface Quality: 60-40 scratch-dig • Coating: 1/4 wave MgF2 coating at 550nm for 0° angle of incidence • Clear Aperture: 90% diameter