Achromatical, 10:1, RMS, incident

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

Magnification: 10:1
Focal length: 16.56
Numerical aperture: 0.25
Working distance (mm): 6.7
Theoretical sharpness depth (mm): 0.004
Parfocalizing length: 45