observatory that pivots
off of the scope (a variant
of the roll-off shed concept)
copyrighted by Daniel Johnson of
Evansville, Indiana They may be used
for nonprofit purposes only.
in the calibration target above, with no color in that target (which shows 17 shades of neutral
gray). If your monitor won't show all 17 shades, concentrate on the darkest shades, with the
darkest nearly black and the next bar just visibly brighter.