Leica M80 - Calculating Magnification and Field of View

Leica M-series User Manual 63
Calculating the Total Magnication and Field of View Diameter
Parameter
MO Magnication of objective
ME Magnication of eyepiece
z Magnication changer position
q Tube factor, e.g. 1.5× for coaxial incident light, 1.6× for 45°
ErgoTube™
r Factor 1.25x if the planachromatic and planapochromatic
objectives of the MZ125/MZ16 are used on the MS5, MZ6,
MZ75 or MZ95
NFOV Field number of the eyepiece. Field numbers are printed on the
eyepieces: 10× = 21, 16× = 14, 25× = 9.5, 40× = 6.
Example
MO 1× objective
ME 25×/9.5 eyepiece
z Zoom position 4
q Coaxial reected light 1.5×, tube factor
r Factor 1.25×
Calculation example: magnication in binocular tube
MTOT VIS = MO × ME × z × q × r
or
1 × 25 × 4 × 1.5 × 1.25 = 187.5×
Calculation example: eld of view diameter in the specimen
∅ OF:
N
FOV
M
O × z ×q ×r