Meade instruction sheet Astro-Tech AT80ED Doublet Refractor Specifications, 3.35” 85mm

astro-tech AT80ED

Thank you for choosing this Astro-Tech AT80ED high- performance ED refractor.

The images from its fully-multicoated ED (Extra-low Dispersion glass element) air-spaced doublet optics are virtually free of the annoying violet haloes of chromatic aberration (spurious color) that are typically seen around the Moon, planets, and bright stars in lesser refractors.

Precision-made, with many useful mechanical features (such as a rotating dual-speed focuser and a very flexible split ring plus dovetail mounting system), the AT80ED is

from Astronomy Technologies

a clear step ahead of competitive scopes.

At its exceptionally low price, we believe that you will find that the mechanical and optical performance of your AT80ED is little short of astonishing.

This instruction sheet will provide you with information on how to get the most out of your new telescope, and how to properly maintain your telescope 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 AT80ED			Tube ring
		Retractable dew shield	Locking collar for 360°
Fine	Right
		Hinged split	rotatable focuser
focus	coarse
		tube rings
knob	focus		Mounting points for
	knob		optional finder	Focusing
				scale on
				focuser
				drawtube

Lock knob for

focuser drawtube

Removable

Dust cover Locking collar for 360° Vixen-style dovetail rotatable focuser

Brass compression ring

1.25” eyepiece

lock knob

Left coarse	2”			Fine
	accessory			focus
focus knob	holder			knob
				Right
				coarse
1.25” eyepiece				focus
	lock knob	Dust		knob
			cap	2” eyepiece
	1.25”			lock knob
	eyepiece
	adapter

Astro-Tech AT80ED Doublet Refractor Specifications

Aperture	80mm (3.1”)
Focal Length	560mm
Focal Ratio	f/7

Objective Type .... air-spaced doublet with ED element

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 ... two glare-reducing baffles in optical tube Focuser ............................... dual-speed Crayford-type

with 11:1 reduction ratio fine focus (a 10:1 ratio Feather Touch focuser is optional); 360° rotating camera angle/observing angle adjuster; and 2” and 1.25” compression ring eyepiece holders

Focuser Travel 3.35” (85mm)

with millimeter scale on drawtube for repeatable focus

Lens Shade retractable

Objective Lens Cover	.............................	slip-on metal
Tripod Mount	dual split hinged tube rings with
Vixen-style dovetail for direct mounting on
Astro-Tech, Celestron, Meade, and Vixen mounts
Tube Diameter		90mm o. d.
Tube Length (lens shade retracted)		18” (457mm)
Tube Length (lens shade extended) ...		21.75” (527mm)

Optical Tube Weight ..... 6.8 lbs (3.09 kg) with standard

focuser; 6.45 lbs (2.93 kg) with optional Feather Touch focuser (both weights include rings and dovetail)

Case	aluminum-frame foam-fitted
lockable hard case, with carrying handle
Case Dimensions	20.75” x 12.75” x 8.75”
Lowest Usable Power	14x (40mm eyepiece)
Highest Terrestrial Power	.......... 80x (7mm eyepiece)
Highest Practical Power	160x (3.5mm eyepiece)
Theoretical Maximum	187x (3mm eyepiece)