Orion 80-T instruction manual Care & Maintenance, Specifications

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. 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 tele- scope. 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 household cleaning fluid

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.

The ShortTube 80-T includes a soft-sided carrying case. The carrying case will hold the ShortTube 80-T safely during transport and doubles as a convenient storage spot when the telescope is not in use. You will need to remove acces- sories such as the eyepiece, diagonal, and finder scope in order to place the telescope into the case. The finder scope can be stored on top of the padded velcro flap that covers the telescope. The other accessories can be stored in the exterior pockets of the carrying case for easy transport.

Specifications

Objective lens:	Achromatic doublet, air-
	spaced
Objective lens coatings:	Fully multi-coated
Aperture:	80mm
Focal length:	400mm
Focal ratio:	f/5
Focuser:	Rack-and-pinion, 1.25",
	accepts camera T-ring
Optical tube length:	15"
Weight of optical tube assembly:	3lbs. 7oz.
Mounting provision:	Dovetail mounting plate
	with 1⁄4"-20 threaded
	holes
Finder scope:	6x Magnification, 26mm
	aperture, correct-
	image, achromatic,
	crosshairs
Eyepieces:	25mm (16x) and 10mm
	(40x) Sirius Plössl,
	1.25" barrel diameter,
	fully coated, threaded
	for Orion filters
Diagonal:	45° correct-image,
	1.25" barrel diameter
Case:	Deluxe soft case with
	exterior pockets

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