This is a Plano-Concave lens, sourced from Qioptiq Photonics, with a diameter of 12.7 mm and a center thickness of 1.5 mm. The lens is made of N-BK7, a popular glass type in the optical industry known for its excellent optical properties. The effective focal length (EFL) of this lens is -200mm, indicating that it is a diverging lens, which spreads out light rays that pass through it.
The lens's inner radius is 0, and the outer radius is also 0, suggesting that it has a simple, straightforward design. The lens is uncoated, meaning it does not have any additional layers to enhance its optical performance or protect it from environmental factors. This lens is designed to operate at a wavelength of 588 nm.
For more detailed information, please refer to the vendor's website, where this lens is currently in stock. The link is provided in the item data for your convenience.