Page 15
3.6 Image Optimisation
(Trim Adjustment)
Vignetting is when the image
appears darker towards one
edge. This effect can be easily
corrected by adjusting the trim
control. To adjust the trim
control, loosen the clamp screw
on the underside of the OptoSplit
III by a quarter of a turn in order to
free the slider which controls the
trim control. Gently move the
slider until the vignetting is eliminated. If the slider is moved too far
then the vignetting will become apparent on the other image and will
need to be adjusted in the opposite direction until both images are the
same intensity. It is important to remember to re-tighten the clamp
screw once the adjustment is complete.
If the OptoSplit III has been configured into single channel (non-split)
mode and Trim adjustment is required to compensate for vignetting
being observed, it is likely the slider will need to be at the extreme of its
range of movement to either end.
Vignetting is a darkening of the image
towards one edge.
Clamp Screw
Trim Controller
TRIM