G311357000 31.5 mm Dia. N-BK7 Double-Convex Lens; EFL=70mm Uncoated

This is a G311357000 31.5 mm diameter N-BK7 double-convex lens with a focal length of 70mm, uncoated. The lens is sourced from Qioptiq Photonics, a renowned vendor in the field of precision optics.

The lens is a symmetric convex-convex design, meaning it has two convex surfaces. This particular model has a base shape of a circle, which is the most common shape for optical lenses due to its symmetry and ease of manufacturing. The lens's geometry includes a diameter of 31.5 mm, a thickness at the edge of 2.1 mm, and a thickness at the center of 5.5 mm. The effective focal length (EFL) is 70 mm, which is the distance from the lens's center to the point where parallel rays of light converge.

The lens is made of N-BK7, a type of glass commonly used in optical applications due to its excellent optical properties. The radii of the curvature for the first and second surfaces are 72.862 mm and -72.862 mm, respectively. The inner and outer radii are both 0, indicating that the lens has no peripheral features that could affect the light path.

The lens is uncoated, meaning it does not have any additional layers applied to its surfaces to alter its optical properties. This can be beneficial in certain applications where the natural properties of the glass are desired, or where cost is a significant factor. However, it's important to note that uncoated lenses can suffer from reduced transmission and increased reflectance, especially at larger angles of incidence.

This lens is currently in stock and can be purchased directly from the Qioptiq Photonics website. The link to the product page is provided in the item data for your convenience.