112-0511E 50.8 mm Dia. x -250 mm FL; Uncoated; Plano-Concave Lens

The 112-0511E is a plano-concave lens with a diameter of 50.8 mm and a focal length of -250 mm, making it a negatively powered lens. This lens is sourced from EKSMA Optics, a reputable vendor known for its high-quality optical components. The lens is uncoated, which means it does not have any additional layers to protect it from environmental factors or enhance its optical properties.

The lens's geometry is characterized by its base shape, which is circular, and its thickness. The edge thickness is 7.5 mm, while the center thickness is 5 mm. The inner and outer radii are both zero, indicating that the lens's curved surface is uniformly curved inward. The lens's effective focal length (EFL) is -250 mm, which is the distance from the lens's principal point to the point where the lens focuses parallel rays of light.

The lens is made of n-BK7 Schott, a common optical glass with a high refractive index and low dispersion. The wavelength for which the lens's specifications are given is 546 nm, which is in the middle of the visible light spectrum. The lens's shape is spherical, meaning its curved surface is a portion of a sphere.

This lens is suitable for various applications that require negative lens power, such as telescopes, cameras, and other optical instruments. However, due to its uncoated nature, it may not perform optimally in harsh environments or under high-intensity light. Therefore, it is essential to consider the operating conditions and requirements of the application before choosing this lens.