Aspherical Lenses
Aspherical lenses are designed to improve your B/W or color camera's low light performance by up to 100% compared to conventional lenses. They are typically used to enhance sensitivity in indoor or outdoor environments with marginal lighting.
1/3'' ,1/2" & 2/3'' Aspherical Lenses, from Computar,Fujinon,Pentax, Vantage,Vista & many more