20-080 25mm Dia. N-BK7 Low Scatter Aspheric Lens; EFL=50mm; NA=0.25 Uncoated

This is the 20-080 25mm Dia. N-BK7 Low Scatter Aspheric Lens, a high-quality optical component sourced from Edmund Optics. The lens is designed with a low scatter feature, making it ideal for applications that require minimal light dispersion.

The lens is made of N-BK7, a type of glass commonly used in optical systems due to its excellent optical properties. The lens has a numerical aperture (NA) of 0.25, which is a measure of the light-gathering ability of the lens. A higher NA allows for a greater light-gathering capacity, making this lens suitable for applications that require high light transmission.

The lens has an effective focal length (EFL) of 50mm, which is the distance over which the lens will focus a parallel beam of light. This makes it suitable for use in imaging systems where a longer focal length is required.

The lens is uncoated, meaning it does not have any additional layers applied to its surface to alter its optical properties. While coatings can be used to reduce reflection, increase transmission, or alter the dispersion properties of a lens, an uncoated lens can be advantageous in certain applications where these properties are not desired.

The lens has a diameter of 25mm and a thickness of 2.9mm at the edge, with a center thickness of 6mm. The front surface of the lens has a radius of curvature of 25.84mm, while the back surface is flat. The lens is designed to be used at a wavelength of 587.6nm.