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Terminology (Basler Lenses)#

Terms for Basler Lenses

Designations According to DIN 1335#

O Object position f' (=H'F') Focal length
O ' Image position k (= f '/ d EP f-number (indicated as "f/k")
H Front principal plane i (=HH') Principal point separation
H ' Back principal plane s F (= SF) Front focal length
F Front focal plane s'F (=S'F') Back focal length
F ' Back focal plane EP (= SP) Entrance pupil position
P Entrance pupil plane s'AP (=S'P') Exit pupil position
P ' Exit pupil plane d (= SS ' Overall optical length
S Vertex of first lens surface d EP Entrance pupil diameter
S ' Vertex of last lens surface d AP Exit pupil diameter
ß'P (=dAP/dEP) Pupil magnification

Other Designations#

FB Flange back MOD Minimum object distance
MSD Maximum screw-in depth CRA Chief ray angle
MBL Mechanical back length Inf。 Infinity
WD Working distance MTF Modulation transfer function