William Optics GT153 f/7.8 Triplet Refracting Telescope - DISCONTINUED -

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  • Regular price $5,998.00

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William Optics GT153 f/7.8 Triplet Refracting Telescope - DISCONTINUED -

Introducing ALL NEW GT153 full-frame imaging APO!

You will be blown away by the small details you can observe through this APO 153mm; fine details of DSOs, stunning resolution both visually or during astrophotography.

Until yesterday this was only a dream at this price!

Key Features

Stunning Optics

  • Features a top-quality triplet air-spaced objective.
  • This scope is extremely sharp and has a great color correction which is ideal for astrophotography.
  • Precision optics with STM coatings.
  • Designed by a leading designer with FPL-53 glass.

3.5: FeatherTouch R&P Focuser

Beautiful Finish

  •  Large 3.5" Feather Touch Focuser:  a treat to use during astrophotography. No image shifting!
  • 360 deg. rotatable.
  • Extra-heavy-duty.
  • Large aluminum knobs.

Ideal For Astrophotos

  • Have you always dreamed of taking those beautiful pictures of the heavens? Now is the time!! Few other refractors in this size have two DEDICATED Field Flattener and a reducer/flattener available.

  • Graduated scale for precise camera alignment.

Do-All Telescope

  • The 153mm objective is a great size for both wide-field and planetary observations.
  • The apochromatic performance makes it ideal for imaging.
  • This size will require a suitable mount in order to do astro imaging.

Beautiful Finish

  • No plastic part used: CNC machined out of solid high-grade aluminum.
  • Pure William Optics quality fit and finish With a powder-painted white CNC-machined aluminum tube, retractable dew shield, anodized 360-degree rotatable FT focuser, engraved dew-shield Bahtinov cap (patented).

Attention to Detail

  • Highly precise CNC machined lens cell.
  • Solid CNC-machined mounting rings with carrying Handel /guiding rings included in the price.
  • Triple testing each lens by Zygo test to ensure the best optical quality (we provide test report at an additional $150).

Total Quality Package

  • Mounting rings, guiding rings, large Losmandy type dovetail, CNC handle, Bahtinov cap and 3”Rotolock adapter are included.
  • Total OTA weight including mounting rings just 13.5kg (29.5lb).
  • New Triplet APO X0.72 Full frame Field flattener reducer also Available From F7.8 cut down to F5.6 only.


Aperture153 mm (6")
Camera/Eyepiece Connection2"
Camera/Eyepiece Connection4&3/32"x24 TPI
Center RMS Spot Size5.2 microns
Dawes Limit0.76 arcseconds
Edge RMS Spot Size25.4 microns
Focal Length1194 mm
Focal Ratiof/7.8
Free ShippingYes
Glass Type53
Highest Magnification306x
Light Gathering Power478x
Limiting Magnitude14.7
ManufacturerWilliam Optics
Optical DesignTriplet