37-430 25mm Dia. N-BK7 Precision Aspheric Lens; EFL=37.5mm; NA=0.33 Uncoated

This is a high-precision aspheric lens, catalog number 37-430, offered by Edmund Optics. The lens is made of N-BK7, a popular borosilicate crown glass known for its excellent optical properties. The lens is uncoated, which means it does not have any additional layers to enhance its optical performance or protect it from environmental factors.

The lens has a diameter of 25mm and a numerical aperture (NA) of 0.33. The NA is a measure of the light-gathering ability of the lens and its ability to resolve fine details. A higher NA allows for a larger cone of light to enter or exit the lens, which can be beneficial in certain applications.

The effective focal length (EFL) of this lens is 37.5mm. The EFL is the distance from the lens at which a light beam is focused to a point. This is an important parameter in lens selection as it determines the magnification of the lens.

The lens has an inner radius of 0mm and an outer radius of 0mm, indicating that it is a symmetric lens. The thickness at the edge is 5.49mm, and the thickness at the center is 9.72mm. The front surface has a radius of curvature (R1) of 19.38mm and is aspheric, meaning it is not a simple sphere but has a more complex shape to correct for spherical aberration.

This lens is a great choice for applications that require high precision and excellent optical performance. However, due to its uncoated nature, it may not be suitable for environments with high humidity or dust.