Leica M-series User Manual 150
Calculating the Total Magnification and Field of View Diameter
Parameter
MO Magnification of the objective
ME Magnification of the eyepiece
zMagnification of the changer position
qTube factor, e.g. 1.5× for coaxial incident light, 1.6× for 45°
ErgoTube™
rFactor 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
qCoaxial reflected light 1.5×, tube factor
rFactor 1.25×
Calculation example: Magnification in the binocular tube:
MTOT VIS = MO × ME × z × q × r
or
1 × 25 × 4 × 1.5 × 1.25 = 187.5×
Calculation example: Field of view diameter in the specimen
∅ OF:
NFOV
MO × z ×q ×r