Meade instruction sheet astro-tech, PARTS OF THE AT111EDT, Lens Shade Outer Diameter

astro-tech

AT 111EDT from Astronomy Technologies

Thank you for choosing this Astro-Tech AT111EDT high-quality apochromatic triplet refractor.

The lenses in your scope’s 777mm f/7 air-spaced triplet optics use Ohara glass exclusively, from Japan’s finest glass manufacturer. They include an advanced ED (Extra- low Dispersion) element to give you images that are virtually color-free, even at very high powers. Thanks to its computer-optimized optical design, top quality ED

glass, and high transmission multicoatings, the optical performance of your AT111EDT is exceptional indeed.

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

Please familiarize yourself with the parts and functions of your AT111EDT before using it for the first time.

PARTS OF THE AT111EDT	Locking knob for 360°	Mounting shoe for
	rotatable focuser	optional finder		Focusing
Lock knob for		2”		scale on
				focuser
focuser drawtube		eyepiece
				drawtube
		holder	1.25”
Retractable dew shield
			eyepiece
			holder

						Fine
						focus
						knob
Dust cover	Brass compression ring	Left coarse	2”			Right
			eyepiece
		focus knob				coarse
			holder
				1.25”		focus
		2” eyepiece				knob
				eyepiece
		lock knob		holder
	1.25” eyepiece	1.25”
	lock knob				1.25” eyepiece
		eyepiece
		holder				lock knob

Astro-Tech AT111EDT Apochromatic ED Triplet Refractor Specifications

Aperture			111mm (4.4”)	Finder	optional; mounting shoe provided for
Focal Length			777mm	Astro-Tech multiple reticle finder or similar finder
Focal Ratio			f/7	Lens Shade			retractable
Objective Type			air-spaced triplet	Lens Shade Outer Diameter		.......................	150mm
using all-Ohara glass, including an ED element				Objective Lens Cover			slip-on metal
Optical Coatings			fully multicoated	Tube Diameter			124mm o. d.
Resolving Power (Dawes’ Limit)			1.04 arc seconds	Tube Length (lens shade retracted)			23.75” (603mm)
Visual Limiting Magnitude		..............	12.7 maximum	Tube Length (lens shade extended)			........ 28” (711mm)
Light Grasp (versus the eye)			251x	Optical Tube Weight			14.65 lbs. (6.66 kg)
Field Stops		three knife-edge baffles		Case	aluminum-frame foam-fitted
Focuser	dual-speed rack and pinion				lockable hard case, with carrying handle
	with 11:1 reduction ratio fine focus;			Case Dimensions			28” x 10.25” x 9”
360° rotating camera angle/observing angle adjuster;				Lowest Usable Power		19.4x (40mm eyepiece)
and 2” and 1.25” compression ring eyepiece holders				Highest Terrestrial Power		86x (9mm eyepiece)
Focuser Travel			5.4” (138mm);	Highest Practical Power		194x (4mm eyepiece)
millimeter scale on drawtube for repeatable focus				Theoretical Maximum		222x (3.5mm eyepiece)