Achromatical, 40:1, RMS, incident

Achromatical incident light objectives for tube length 160 (RMS thread, parfocalizing length = 45 mm) 

Magnification: 40:1
Focal length: 4.52
Numerical aperture: 0.65
Working distance (mm): 0.6
Theoretical sharpness depth (mm): 0.001
Parfocalizing length: 45