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Back Focus is the correct distance between the camera image
sensor and the plane of the C-mount which allows an image to
focus identically in both the microscope and the monitor.
If the focus differs only slightly from the eyepieces to the
image on the monitor, check the focus adjustment on the
eyepieces. Each eyepiece has a fine focus adjust and may be
adjusted to another person's eyes. Focus the image in the
monitor first, then focus the eyepieces to each eye. Use low
magnification for this adjustment.
If there is a large variation in the focus, set the
eyepieces at zero and turn the microscope to the highest
magnification (do not use an oil immersion objective) and
focus the scope through the eyepieces. If the focus on the
monitor is off, loosen the knurled lock ring behind the
C-Mount adaptor on the camera head. Then loosen the set
screw(s) for the C-mount adaptor on the photo tube of the
microscope. Rotate the C-mount adaptors together until you
attain a focused image in the monitor. Do not rotate the
camera head as you may twist and damage the camera cable.
Turn the microscope back to low magnification and again
focus the scope through the eyepieces. If the focus on the
monitor is still off, rotate C-mount adapter body again to
attain a focused image on the monitor. The camera should now
be parfocal with the scope.
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