William Optics GT153 3.5-Inch Feathertouch - Triplet Refractor - Red

  • Perfect for astrophotography, providing incredible clarity in every image.
  • Suitable for wide-field, planetary, and deep-sky applications
  • Includes Feathertouch focuser for the most precise focus each use.
  • Please Note: Case and Guide scope are not included, but can be purchased separately.
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  • Regular price $5,998.00

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William Optics GT153 3.5-Inch Feathertouch - Triplet Refractor - Red

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

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.
  • Focal ratio of f/7.8

3.5-Inch Feather Touch R&P focuser

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

Ideal for Astrophotography: 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. There is a graduated scale for precise camera alignment.

Do-all Telescope

  • The 153 mm 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.

Simply Beautiful Finish

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

Attention to Details

  • Highly precise CNC machined lens cell.
  • Solid CNC-machined mounting rings with carry 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 additional $150).
  • Total OTA weight including mounting rings just 13.5kg (29.5lb).


Aperture153 mm (6")
Camera/Eyepiece ConnectionFemale 3.5" Feather Touch Focuser Thread (5.125—24 TPI)
Dawes Limit0.76 arcseconds
Focal Length1053 mm
Focal Ratiof/6.9
Free ShippingYes
Glass TypeFPL_53
Hightest Magnification306x
Light Gathering Power478x
Limiting Magnitude14.7
ManufacturerWilliam Optics
Optical DesignTriplet
Tube Weight29.5 lbs


  •  2018GT153 f/7.8 Triplet Refracting Telescope - In Blue, Red, or Gold
  • 3.5-inch Feather Touch Focuser
  • Mounting rings
  • Guiding rings
  • Large Losmandy type dovetail
  • CNC handle
  • Bahtinov cap
  • 3-Inch Rotolock adapter 

Please Note: Case and Guide scope are not included, but can be purchased separately.