Digital Microscopy Center, University of Washington
July 29, 2016
3
Table 2. Neutral density filters and combinations for transmitted light.
Filter
Light Reduction
% Transmission
ND2
1/2
50%
ND4
1/4
25%
ND16
1/16
6.25%
ND2+ND4
1/8
12.5%
ND2+ND16
1/32
3.125%
ND4+ND16
1/64
1.562%
ND2+ND4+ND16
1/128
0.781%
Condenser focus
Substage field diaphragm
Brightfield lamp power
Brightfield lamp voltage
Figure 1. Sub-stage Controls
Fine Focus
Coarse Focus
Transmitted
Light
ND Filters
“Photo” switch