Clear Aperture

203 mm

Focal Length

1218mm

Material

Optical crown and flint glasses

Structure

Air-spaced doublet

Color Correction

Aspherical Achromatic

Surface Quality

60-40 scratch & dig or better

Surface Accuracy

λ/4 P-V at 632.8nm or better

(with hand figuring on the last surface)

Coating

Multilayer broadband Anti-reflection Coating

Quality Guarantee

Interference Test Report for each lens