DM745-HDM11 User Guide
DM745-HDM11 User Guide
Page 10
Optical Magnification
This microscope uses a combination of a fixed-magnification 1X objective lens and zoom optics to provide its 0.7X-4.5X
magnification range. This is the optical magnification range which is typically listed. An additional 0.35X magnification
stage is used to compensate for the format of the digital image sensor. This document refers to this stage as integrated
reduction, since the purpose is to reduce the size of the image to better fit the specific image sensor. While this reduc
-
tion stage modifies the overall magnification prior to being imaged, it is typically not referenced in listed magnifications
due to its association with the image sensor. However, it should be used when calculating total system magnification as
described in the following section about monitor magnification.
Monitor Magnification
Since the image displayed on the monitor is larger than the camera’s sensor, the monitor is considered to have its own
magnification referred to as monitor magnification. The magnification factor is calculated by dividing the diagonal of the
on-screen image by the diagonal of the camera’s sensor.
294mm/6.39mm = 46
Total system magnification includes all of these factors, and can be calculated using the formula:
M
OBJ
x M
RED
x M
MON
= M
TOT
where M
OBJ
is objective magnification, M
RED
is integrated reduction, M
MON
is monitor magnification, and M
TOT
is total mag-
nification. The low and high magnifications would be as follow:
0.7 x 0.35 x 46 = 11.27
4.5 x 0.35 x 46 = 72.45
