6
and threads onto the ShortTube’s focuser drawtube, cou-
pling the camera body to the telescope (Figure 3).
For closer-range (less than 1/4-mile) terrestrial photography,
you need both a T-ring for your camera and a T-adapter
(#5264), which provides the extra focus travel needed.
Remove the nosepiece from the camera adapter; the body
of the adapter will not be needed here. Connect the T-ring
to your camera body (remove any camera lenses first), and
connect the nosepiece of the camera adapter to the T-ring.
Now, insert the entire assembly into the focuser’s drawtube
(remove the eyepiece and diagonal), and secure with the
thumbscrew on the drawtube. Be sure to tighten the thumb-
screw, or your camera could fall to the ground!
Use the camera’s viewfinder to frame the picture. Use the
telescope’s focuser to focus the image. Tighten the focus
lock thumbscrew on the telescope’s focuser to make sure
the camera does not slip out of focus.
You may want to consider using a remote shutter release
instead of the shutter release on the camera. Touching the
camera can vibrate the system and blur the resulting photo-
graphic image. Also, be sure to use a solid tripod.
Care & Maintenance
Give your telescope reasonable care and it will last a life-
time. Store it indoors or in a dry garage. Do not leave the
telescope outside except when using it. The optical tube is
aluminum and has a smooth painted surface that should
resist scratches and smudges. If a scratch does appear
on the tube, it will not harm the telescope. If you wish, you
can apply some white auto touch-up paint to the scratch.
Smudges on the tube can be wiped off with standard house-
hold cleaners such as Windex or Formula 409.
Any quality optical lens tissue and cleaning fluid specifically
designed for multi-coated optics can be used to clean the
telescope’s objective lens as well as the lenses of the eye-
pieces and finder scope. Never use regular glass cleaner or
cleaning fluid designed for eyeglasses. Before cleaning with
fluid and tissue, however, blow any loose particles off the
lens with a blower bulb or compressed air, or lightly brush
the lens with a soft camel hair brush. Apply some cleaning
fluid to a tissue, never directly on the optics. Wipe the lens
gently in a circular motion, then remove any excess fluid
with a fresh lens tissue. Oily fingerprints and smudges may
be removed using this method. Use caution; rubbing too
hard may scratch the lens! On larger lenses, clean only a
small area at a time, using a fresh lens tissue on each area.
Never reuse tissues.
Specifications
Objective lens: 80mm glass achromat, fully coated
Focal length: 400mm
Focal ratio: f/5
Optical tube length: 15"
Weight of optical tube assembly: 3 lbs., 7 oz.
Mounting provision: 1/4"-20 threaded receptacle
Finder scope: 6x magnification, 26mm aperture, correct-
image, achromatic, crosshairs
Eyepieces: 25mm (16x) and 10mm (40x) Sirius Plössl,
1.25" barrel diameter, fully coated
Diagonal: 45° correct-image, 1.25" barrel diameter
Summary of Contents for ShortTube 80 9386
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