Nikon ECLIPSE MA200 Instructions Manual page 25

Return to the bright-field or dark-field microscopy under the episcopic illumination.
Chapter 2 Microscopy
1 Turn the BD field changeover lever to the "BF
(bright-field)" or "DF (dark-field)" position. (See
3.3.)
2 Turn the brightness control dial to adjust the
brightness. (See 3.2.1.)
3 Adjust the brightness with the desired ND filter in
the filter turret. (See 3.10.)
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