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JMI - NGT-18 (f/4.5) 18" Telescope


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Availability: Available - Ships in 2-4 Days


Available - Ships in 2-4 Days

Manufactured by: Jims Mobile, Inc. (JMI)

JMI NGT-18 (f/4.5) 18" Telescope


JMI NGT 18 f/4 28" Telescope



  • Open truss Newtonian
  • Split-ring equatorial mount
  • Rotating nose assembly
  • Compact size
  • Fast assembly
  • 18-point flotation mirror cell
  • Includes StellarCAT ServoCAT Jr. Track/GOTO compatible with Go-To computers and planetarium software
  • NGC-superMAX (Argo Navis) Go-To computer
  • CCD Autoguider compatible
  • Battery and AC operation
  • Adjustable focal point
  • Snap-fit Serrurier truss rods
  • Massive 2" declination ball bearings
  • Personalized name plaque
  • JMI's celebrated quality construction


  • Type: Newtonian reflector
  • Mount: Equatorial split-ring
  • Mirror: 18" f/4.5 enhanced primary, 4" enhanced diagonal secondary
  • Power: 12vDC operation with lead-acid batteries or adapter
  • Weight: approximately 245 lb., the heaviest single component is 75 lb.
  • Height: 80" assembled, 30" collapsed, Eyepiece height 76" at Zenith
  • Width: 36"
  • Depth: 30"
  • Finder: 9x50 straight through

Standard Equipment

  • Rotating Nose Assembly for comfortable viewing of any part of the sky.
  • EV-2n Focuser with Motor for motorized focusing. (upgrades available)
  • Extension Tube for 2" Focuser.
  • 25mm 1.25" Plossl Eyepiece.
  • 9x50 Finder Scope (straight-through) with dovetail mount.
  • Piggy-Back Camera Mount for piggy-back photography.
  • Off-Axis Counterweight for attaching to the piggy-back camera mount (2).
  • Serrurier Truss Rods snap fit into heat treated, spring steel cavities.
  • Adjustable Focal Point including three different nose assembly mounting positions for visual and photographic work.
  • Sliding Counterweights positioned along the truss rods for fine tuning the balance (4).
  • Split-Ring Equatorial Drive with 36" drive ring.
  • 18-Point Flotation Mirror Cell.
  • 18" Mirror. A precision annealed 2" thick Pyrex diffraction-limited primary mirror with enhanced coating giving 95-96% reflectivity.
  • Primary Mirror Dust Cover with Two F-Stops providing 3" and 6" apertures.
  • Mirror Cooling Fan with filter and grill.
  • Integrated Optical Encoders and a StellarCAT tracking, slewing and Go-To system.
  • NGC-superMAX (Argo Navis) Computer digital setting circles with an over 29,000-object database and too many features to list here.
  • Battery or AC Power with 12vDC 4.6A rechargeable lead-acid batteries, audible low battery alarm, 12vDC cigarette lighter adapter and 110vAC/60Hz or 220vAC/50Hz (specify) wall transformer.
  • Built-In Lifting Handles permit easy transportation.
  • Latitude Adjustment with scale for fine adjustment of latitude setting. Adjusts from 30º to 55º. (modification available see Low Latitude Base Wedge below)














Additional Information

Name JMI - NGT-18 (f/4.5) 18" Telescope
Manufacturer Jims Mobile, Inc. (JMI)
Model NGT18
Manufacturer Part No NGT18
Finderscope 9x50 straight through
Height 80" assembled, 30" collapsed, Eyepiece height 76" at Zenith
Mount Equatorial split-ring
Optical Design Newtonian reflector
Power 12vDC internal lead-acid batteries or AC adapter for fan operation