These are labeled as part# 22 KLS 018/066, but were originally included in a lens kit # 01 KLS 001/066 that sold for $1750 for 40 lenses. Mounting is 25mm diameter x 10mm thick. Glass is BK7 glass, surface quality is 60-40 scratch and dig. Design wavelength is 546.1nm with a wavelength range of 400-700nm. Lenses are anti reflection coated. Unused. Limited supply!
