Same as out PA1019 but not coated or cemented. Manufacturer's part #01 LAO 018. Original price: $62.00. Made of crown and flint glasses. Surface accuracy is 1/4 wave at 546.1nm, design wavelength of 488, 546.1, 643.8nm. Clear aperture of 7.2mm, center thickness is 5.1mm, edge thickness is 4.4mm, surface quality is 60-40 scratch and dig, centration of 3 arc minutes. Unused.
