Nikon T1-FM Instructions Manual page 51

Filter block
changeover lever
ND filter/shutter slider
Collector lens focus lever
Arc image
Centering the lamp
(1) Pull out the ND filter/shutter slider to the left until it stops to place the shutter in the optical
path.
(2) Place an empty revolving nosepiece hole (no objective) in the optical path. (If there are
objectives in all the revolving nosepiece holes, remove one and place that hole in the optical
path.)
(3) Place a piece of thin, white paper such as plain paper or a business card on the stage.
(4) Push in the changeover lever for the B excitation or G excitation filter block to place the filter
block in the optical path.
(5) Turn the field diaphragm lever in the "O" direction as far as it will go and fully open the field
diaphragm.
(6) Pull out the ND filter/shutter slider to the right until it stops and project the arc image onto a
piece of white paper. (If the arc image projected onto the white paper is too bright, place the
ND8 filter in the optical path by inserting it into the ND filter receptacle of the ND filter/shutter
slider or slightly close the field diaphragm. Do the reverse if the image is too dark.)
If the arc image is not inside the projection surface
If the arc image is not inside the projection surface, the lamp is significantly out of position
either horizontally or vertically. Turn the horizontal lamp centering knob or the vertical lamp
centering knob to bring the arc image (still out of focus) into roughly the center of the
projection surface.
Check that the arc image focus does not change even when the back mirror focusing knob is
turned. If the focus changes, this indicates that the mirror image is being projected. In this
case, bring the other image into the center of the projection surface as described above to
perform centering. (See above Figure
(7) Move the collector lens focus lever to focus the arc image on the white paper (still not
centered). In this position, secure by turning the collector lens focus lever clockwise. (See
above Figure )
(8) Turn the back mirror focus knob to add the mirror image on the white paper. (See above
Figure )
(9) Turn the horizontal lamp centering knob and vertical lamp centering knob to adjust so that
the arc image and mirror image overlap in the center of the projection surface. (See above
Figure )
This ends centering.
IV Operation of Each Part
5 Mercury lamp and lamphouse
Field diaphragm lever
Mirror
image
Bright spots
visible in the
arc image
)
E-19
Vertical lamp centering knob
Back mirror focus knob
Horizontal lamp centering knob
Arc image Overlap of
the two images
IV