Fitting Accessory Tubes; Double-Iris Diaphragm; Drawing Tube - Leica M-Series User Manual

Accessories
Double-iris diaphragm, drawing tube,
discussion tube
Fitting
• All accessory tubes which fit between the optics carrier and
the binocular tube are fitted in the same manner.
• In the dovetail ring of the optics carrier is a locating screw
which must engage the notch in the accessory (page 19).
This is best accomplished by moving the accessory slightly
from side to side.

Double-iris diaphragm

Release the clamping screw.
Introduce the accessory tube
into the dovetail ring in the same
manner as the binocular tube
(page 19) and move it slightly
from side to side until the
locating screw engages the
notch.
Tighten the clamping screw.
Fit the binocular tube on the
accessory tube in the same
manner.
The double-iris diaphragm can be
fitted between the optics carrier and
either the binocular tube or the
video-/phototube.
Set the lever to OPEN:
The double-iris diaphragm (aperture
diaphragm) is open.
The depth of field increases as
the lever is moved from OPEN to 1.
Remember, however, that
– brightness decreases, so
exposure times become longer
– resolution deteriorates.

Drawing tube

• The drawing tube is for both left-handers and right-handers.
Fit the mirror on the left- or right-hand side of the optics
carrier.
Drawing
• In general, the paper needs to be illuminated strongly,
but the object only weakly.
Move the lens mount of the drawing tube forwards or
backwards until the drawing surface is sharply imaged.
Now you can draw the feature.
• If you place a graduated scale beneath the object and draw
its intervals as well, you will easily determine the image
scale on the paper.
Discussion tube
Down the discussion tube two observers see the same erect,
laterally-correct, three-dimensional image.
The assembly and use of the discussion tube are described in
the separate user manual M2-263-004.
Fit the drawing tube between the
optics carrier and the binocular
tube as described on the left of
this page.
Place a sheet of paper beneath
the mirror.
Use a table lamp to illuminate
the paper.
Move the lever to the circle.
Look into the binocular tube,
position the object, and focus
on it.
Move the lever to the black spot.
Look into the binocular tube and
balance the brightnesses so that
the object, the drawing surface
and the pencil are all seen
together.
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