Celestron SS80 - Photography Hints; Metering and Vibration Reduction

PHOTOGRAPHY HINTS
Aside from the specific information for each spotting scope listed in
the appropriate section, there are some general photography hints that
apply to all instruments.
Metering
Celestron spotting scopes have fixed apertures and, as a result, fixed
f/ratios. To properly expose your subjects photographically, you need
to set your shutter speed accordingly. Most 35mm SLR cameras offer
through-the-lens metering which lets you know if your picture is
under or overexposed. Adjustments for proper exposures are made
by changing the shutter speed. Consult your camera manual for
specific information on metering and changing shutter speeds.
Reducing Vibration
Releasing the shutter manually can cause vibrations, producing
blurred photos. To reduce vibration when tripping the shutter, use a
cable release. A cable release keeps your hands clear of the camera
and lens, thus elimiiuiting the possibility of introducing vibration.
Mechanical shutter releases can be used, though air type releases are
best.
Blurry pictures can also result from shutter speeds that are too slow.
To prevent this, use films that produce shutter speeds greater than 1/
250 of a second when hand-holding the lens. If the lens is mounted on
a tripod, the exposure length is virtually unlimited.
Another way to reduce vibration is with the Vibration Suppression
Pads (#93503). These pads rest between the ground and tripod feet.
They reduce the amplitude and vibration time of your spotting scope
when shaken by the wind or bumped accidentally.
22 SS80IC90