Manufacturer's part #01 LDK 028. Original price: $35.00. Made of BK7 glass, design index is 1.5187, design wavelength is 546.1nm, center thickness is 2.5mm, edge thickness is 3.5mm. Surface quality is 60-40 scratch and dig, centration is 3 arc minutes, and edges are ground and beveled. Unused.
