Askar SQA85 85mm f/4.8 Quintuplet APO

Quintuplet air-spaced lens design, including 2 pieces of SD glass. The central star point has an RMS radius of less than 1.6 um, and the star point at the corner is less than 2.5 um, showing a super-fine star point. It also has excel-
lent full-field illumination and MTF data.