LaCroix Optical part #18949. Cemented doublet achromat, 23.375mm (0.999") diameter by 74.79mm focal length. Has AR023 coating with less than 0.2% reflection at 633nm. Has very high precision surface spec of 10-5 scratch/dig. Center thickness is 11mm. Glass is S-BSM14 and S-LAM3 (Lanthanum glass with index 1.717). Complete spec sheets for each element and combined will be included with your order. Unused. Only have a few.
