Uncoated N-BK7 Bi-Convex Lenses are popular for many finite imaging applications. This type of lens is best suited for use in situations where the object and image are on opposite sides of the lens and the ratio of the image and object distances (conjugate ratio) is between 0.2 and 5. These lenses are designed to have a focal length of f= (R1*R2)/((n-1)*(R2-R1)).

N-BK7 is probably the most common optical glass used for high-quality optical components. It is typically chosen whenever the additional benefits of UV fused silica (i.e., good transmission further into the UV and a lower coefficient of thermal expansion) are not necessary.

Although this page features our uncoated bi-convex lenses, these lenses are also available with one of four antireflection coatings (-A, -AB, -B, or -C) deposited on both sides to reduce the amount of light reflected from each surface.

Wavelength Range: 350 - 2000 nm (Uncoated)

Focal Lengths Available from 2.0 mm to 1.0 m

Well Suited for Many Finite Imaging Applications

Offers Excellent Transmittance Throughout the Visible and Near Infrared