Meade Instruments Corporation
Telescopes · Binoculars · Microscopes


 
Meade Apochromatic Refrators Instruction Manuals
Models 102ED, 127ED, 152ED, and 178ED
 INTRODUCTION
IMPORTANT NOTICE! Never use a telescope or spotting scope to look at the Sun! Observing the Sun, even for the shortest fraction of a second, will cause irreversible damage to your eye as well as physical damage to the telescope or spotting scope itself.
[ toc ] 1. Optics

In early 1991 Meade engineers and opticians set out to develop the most advanced, mid-aperture apochromatic refractors ever made available to the amateur or professional astronomer. In studying all of the glass-types and designs available, it rapidly became clear to Meade optical designers that an air-spaced ED-glass doublet objective lens met all of the required design criteria: apochromatic performance with absolutely superb color corrections at all photo-visual wavelengths, even at the highest magnifications; relatively light weight for rapid thermal equalization; and excellent durability and resistance to weathering.

The objectives included with Meade ED apochromatic refractors are manufactured entirely at the Meade Irvine facility and utilize the highest-grade optical glasses available; they are free of striae and other imperfections that can degrade optical performance. Each lens is individually manufactured, pitch-polished, and hand-figured by a master optician to reach the highest levels of resolution, contrast, and correction obtainable.

[ toc ] 2. Equatorial Mount

As important to the serious observer as superb imaging performance, Meade LXD 650 and LXD 750 German-type equatorial mountings, manufactured at the Meade Irvine factory, have revolutionized forever the way amateur astronomers think about telescope mounting platforms. Standard features include:

  1. Massive polar and declination castings with oversize thrust surfaces.
  2. Worm-gear tracking and microfine manual slow-motion controls in both R.A. and Dec.
  3. Eight ball bearings (4 on each axis) carry even heavy loads with supreme precision.
  4. Micrometric azimuth and elevation controls permit precise polar alignment.
  5. Superstable field tripods, including the Meade Giant Field Tripod supplied with LXD 750 equatorial mounts.

[ toc ] 3. Optional Computer Drive System

The #1697 Computer Drive System (CDS) offers an electronic package which permits the location and observation of the major planets as well as hundreds of deep-sky objects the very first night you use the telescope. Even for the experienced amateur the telescope's pushbutton electric slewing, digital readouts, Smart Drive, and much more, open up visual and photographic capabilities heretofore undreamed of.

[ toc ] 4. Standard Equipment

Specifications and Features: Meade ED Apochromatic Refracting Telescopes

TELESCOPE: 4" Model 102ED 6" Model 127ED 6" Model 162ED 7" Model 17SED
optical Design 2-element ED Apochromat 2-element ED Apochromat. 2-element ED Apochromat 2-element ED Apochromat
Diameter 110mm 135mm 160mm 188mm
Clear Aperture 102mm (4.0") 127mm (5.0") 152mm (6.0") 178mm (7.0")
Focal Length 920mm f/9 1140mm f/9 1370mm f/9 1600mm f/9
ResolvIng Power (arc secs.) 1.1 0.9 0.74 0.64
Super Multi-Coatings on Front Element Standard, both sides Standard, both sides Standard, both sides Standard, both sides
Near Focus (approx.) 50 ft. 75 ft. 100 ft 150 ft.
Limiting Visual Magnitude 12 12.8 13.5 13.8
Limiting Photographic Magnitude 14.6 15.3 16 16.3
Image Scale 1.54°/inch 1.26°/inch 1.05°/inch 0.90°/inch
Maximum Practical Visual POV".OR 40OX 50OX 60OX 70OX
Actual Field with SWA 40mm Eyepiece 2.9° 2.35° 1.95° 1.67°
35mm Angular Film Coverage 1.48° x 2.11° 1. 1 9° x 1.70° 0.99° x 1.41° 0.85°x 1.21°
Optical Tube Dimensions (dia. x length) 4.5" x 31.5" 5.5" x 40.75" 7" x 51" 8" x 59.5"
Dow Shield (dis. x length) 5.5" x 5.5" 7" x 7" 8.25" x 8.5" 9.8' x 10"
Focusing Mechanism 2.7" I.D.; 4"travel 2.7" I. D.; 4" travel 2.7" I.D.; 4" travel 2.7" I.D.; 4" travel
Eyepiece-Holder 2", with 1.25" adapter 2", with 1.25" adapter 2", with 1.25" adapter 2", with 1.25" adapter
Diagonal Mirror 2" #930 2" #930 2" #930 2" #930
Equatorial Mounting LXD 650; German-type LXD 650; German-type LXD 750; German-type LXD 750; German-type
Ball Bearings 8 - 2.25" dia. 8 - 2.25" dia. 8 - 3. 1" dia. 8 - 3.1" dia.
Tripod Standard Field Tripod Standard Field Tripod Giant Field Tripod Giant Field Tripod
Tripod Legs Inner leg: 1.5" O.D.; Inner leg: 1.5" O.D.; Inner leg: 2" O.D.; Inner leg: 2" O.D.;
  Outer leg: 2" O.D. Outer leg: 2" O.D. Outer leg: 3" O.D. Outer leg: 3" O.D.
Tripod Height 30" - 44" variable 30" - 44" variable 40" - 50" variable 40" - 50" variable
Counterweight(s) 1 - 10 lb. 1 - 15 lb. 1 - 25 lb. 1 - 25 lb. & 1 - 12 lb.
Worm Gear Dias. RA & Dec: 2.8" RA & Dec: 2.8" RA & Dec: 3.75" RA & Dec: 3.75"
Setting Circles RA: 4"; Dec: 4.15" RA: 4"; Dec: 4.15" RA: 4.75"; Dec: 5" RA: 4.75"; Dec: 5"
Manual Slow-Motion Controls RA and Dec RA and Dec RA and Dec RA and Dec
Latitude Range 1 5° to 60° 15° to 60° 20° to 60° 20° to 60°
Optional Computer Drive System (see below) #1697 CDS #1697 CDS #1697 CDS #1697 CDS
Materials        
   Objective Lens KF3; ED/FK01 KF3; ED/FK01 KF3; ED/FK01 KF3; ED/FK01
   Optical Tube aluminum aluminum aluminum aluminum
   Equatorial Mounting aluminum castings aluminum castings aluminum castings aluminum castings
   Field Tripod chromed steel chromed steel chromed steel chromed steel
Total Net Telescope Weight (approx., with mount & tripod) 69 lbs. 78 lbs. 153 lbs. 176 lbs.
Heaviest Sub-Section for Field Assembly 23 lbs. 23 lbs. 55 lbs. 55 lbs.
Shipping Weight (approx.) 86 lbs. 96 lbs. 185 lbs. 212 lbs.

Meade ED Apochromatic Refracting Telescopes Optional Computer Drive System

OPTIONAL DRIVE SYSTEM: #1697 Computer Drive System (CDS)
Drive Motors 9-speed microprocessor-controlled DC servo motors in RA and Dec with Smart Drive software.
Slow Speeds 2x, 32x sidereal; 2°/sec. - 8°/sec., in 1°/sec. increments
Onboard Celestial Object Database 64,359 objects
Hand Controller Motorola 68HC05 microcontroller; 2 line x 16 alphanumeric character display; 19 button keypad, red LED backlit.
Main Controller 16MHz 68000 microprocessor; 128K program
  memory; 16K RAM; 612 byte non-volatile memory (EEROM)
Power Source 18 volts DC

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