Meade instruction sheet astro-techAT80EDT, from Astronomy Technologies, PARTS OF THE AT80EDT

astro-tech AT80EDT

Thank you for choosing our Astro-Tech AT80EDT high- performance apochromatic triplet ED refractor.

While some observers might doubt that you can get apochromatic performance from an 80mm scope that is as inexpensive as the Astro-Tech AT80EDT, we can say only that seeing is believing.

The images from its fully-multicoated 560mm f/7 ED (Extra-low Dispersion element) premium Ohara glass triplet optics are virtually color-free, even at high

from Astronomy Technologies

magnifications. At its low price, we believe you will find that the visual and photographic performance of your AT 80EDT triplet is little short of remarkable.

This instruction sheet will provide you with information on how to get the most out of your new refractor, and how to properly maintain your scope so it can give you a lifetime of observing enjoyment.

Please familiarize yourself with your telescope’s parts and functions before operating it for the first time.

PARTS OF THE AT80EDT

1.25” eyepiece	Locking collar for 360°	Retractable	Mounting point for
lock knob	rotatable focuser	dew shield	optional finder	Focusing
				scale on
				focuser
				drawtube

Fine focus

knob Right coarse focus knob

		Combined equatorial mount	Left coarse
Lock knob for		dovetail and L-bracket	focus knob
focuser drawtube		tripod mounting shoe
		1/4”-20 thread	2”
	tripod mounting holes
			eyepiece
	in base of reversible
Dust cover			holder
		bracket
			1.25”
Brass compression ring			eyepiece
			lock knob
1.25” eyepiece			1.25”
			eyepiece
		lock knob
			adapter

Fine focus knob

1.25”Right

eyepiece coarse

adapterfocus knob

2” eyepiece

lock knob

Astro-Tech AT80EDT Apochromatic Triplet Refractor Specifications

Aperture		80mm (3.1”)
Focal Length		560mm
Focal Ratio		f/7
Objective Type	triplet using Ohara ED glass
Optical Coatings		fully multicoated
Resolving Power (Dawes’ Limit)		1.45 arc seconds
Visual Limiting Magnitude		12.0 maximum
Light Grasp (versus the eye)		131x
Field Stops	glare-reducing baffle in optical tube
Focuser	dual-speed Crayford-type
	with 11:1 reduction ratio fine focus;

2” and 1.25” compression ring eyepiece holders; 360° rotating camera angle/observing angle adjuster

Focuser Travel	3.1” (80mm),
millimeter scale on drawtube for repeatable focus
Lens Shade	retractable

Objective Lens Cover ......................... slip-on metal

Tripod Mount .. removable combination L-bracket and dovetail for direct mounting on Celestron, Meade, and Vixen equatorial mounts; two 1/4”-20 thread mounting holes for photo tripod use

Tube Diameter			90mm o. d.
Tube Length (lens shade retracted)			17.75” (451mm)
Tube Length (lens shade extended) ...			20.25” (514mm)
Optical Tube Weight		6.75 lbs. (3.07 kg)
Case	aluminum-frame foam-fitted
lockable hard case, with carrying handle
Case Dimensions		22.25” x 12.75” x 8.25”
Lowest Usable Power		14x (40mm eyepiece)
Highest Terrestrial Power		....... 80x	(7mm eyepiece)
Highest Practical Power		140x	(4mm eyepiece)
Theoretical Maximum		187x	(3mm eyepiece)