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William Optics
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Optical Accessories 

Unlock the maximum potential of your telescope with our Optical Upgrades. This specialized category includes high-precision Robotic Focusers (ESATTO, EAF) for perfect clarity, Focal Reducers and Flatteners to optimize your field of view for astrophotography, and dedicated Guide Scopes for pinpoint tracking. Whether you're looking to automate your focus or correct optical aberrations, we provide the elite tools needed for award-winning celestial images
[WIL-P-FLAT6AIII] William Optics All New Adjustable Flat6AIII WIL-P-FLAT6AIII
Optical Accessories
William Optics All New Adjustable Flat6AIII
$ 221.61

William Optics FLAT6AIII Adjustable Field Flattener

2" x0.8 reducer APO adjustable field flattener, It has M63 threads for GT71 /GT81 /Z103 /Z81

  • Refine your flat-field performance.
  • Fully multi-coated Ohara glass optics.
  • Reducing factor: 0.8X.
Add to Cart
[WIL-P-FLAT68III] William Optics Flattener 68III image_2026-04-28_122520611.webp 2 UNITS LEFT
Optical Accessories
William Optics Flattener 68III
$ 639.14

Achieve perfect edge-to-edge sharpness and round stars with this premium 1.0x adjustable field flattener, specifically engineered for f/6 to f/7.5 refractors.

  • Full-Frame Ready: Features a 45mm illuminated image circle, perfect for Full-Frame DSLR and CMOS cameras.
  • Precision Optics: Doublet air-spaced design using high-quality Ohara optical glass with STM coatings.
  • Flexible Adjustment: Built-in adjustable distance scale for easy fine-tuning (e.g., 13.6mm for 102GTS / 7.7mm for FLT132).
  • Premium Build: CNC-machined with a blackened interior to eliminate internal reflections and glare.
Add to Cart
[WIL-M-G50PB-WG] William Optics Slide-base UniGuide 50mm Scope (Gold) WIL-M-G50PB-WG
Guide Scopes
William Optics Slide-base UniGuide 50mm Scope (Gold)
$ 157.38

William Optics UniGuide 50mm Slide-Base Guide Scope with 1.25" RotoLock - Gold - M-G50PB-WG

  • Get in perfect focus with this high-quality William Optics Guide Scope.
  • 1.25-inch RotoLock design for smooth and accurate focusing.
  • This is the Gold version.
  • Focal Length: 200 mm (7.87")
  • Focal Ratio: f/4
  • Diameter: 50 mm
  • Total Guide Scope Length: 265 mm
  • Included: 1.25" RotoLock
  • Focusing: Front Focuser System w. Focus Lock Ring
  • Weight: 515g (1.14 lb)
Add to Cart
[WIL-M-G50PB-TG] William Optics Slide-base UniGuide 50mm Scope (Space Gray) WIL-M-G50PB-TG
Guide Scopes
William Optics Slide-base UniGuide 50mm Scope (Space Gray)
$ 157.38

William Optics UniGuide 50mm Slide-Base Guide Scope with 1.25" RotoLock - Space Gray - M-G50PB-WG

  • Get in perfect focus with this high-quality William Optics Guide Scope.
  • 1.25-inch RotoLock design for smooth and accurate focusing.
  • This is the Space Gray version.
  • Focal Length: 200 mm (7.87")
  • Focal Ratio: f/4
  • Diameter: 50 mm
  • Total Guide Scope Length: 265 mm
  • Included: 1.25" RotoLock
  • Focusing: Front Focuser System w. Focus Lock Ring
  • Weight: 515g (1.14 lb)
Add to Cart
[WIL-M-G32PB-GD] William OpticsUniGuide 32mm Scope (Gold) WIL-M-G32PB-GD 1 UNITS LEFT
Guide Scopes
William OpticsUniGuide 32mm Scope (Gold)
$ 125.26

A premium, ultra-lightweight guide scope designed for seamless, ring-free integration with your astrophotography rig.

  • High-Precision Tracking: Fast f/3.75 optics ensure bright, pin-sharp stars for your guide camera.
  • Easy Focusing: Features a built-in adjustable dew shield mechanism with 25mm of travel for precise focus.
  • Universal Connection: Ready for M42 or 1.25" cylindrical cameras like ZWO Mini, QHY, and others.
  • Ultra-Light: At only 240g, it keeps your payload low without sacrificing stability.
Elegant Gold Edition: Matches perfectly with WO Gold/Grey telescopes. The slide-base fits directly into WO Saddle Handles (no rings required).
Add to Cart
[WIL-M-G32PB-TG] William OpticsUniGuide 32mm Scope (Space Grey) WIL-M-G32PB-TG 3 UNITS LEFT
Guide Scopes
William OpticsUniGuide 32mm Scope (Space Grey)
$ 125.26

A premium, ultra-lightweight guide scope designed for seamless, ring-free integration with your astrophotography rig.

  • High-Precision Tracking: Fast f/3.75 optics ensure bright, pin-sharp stars for your guide camera.
  • Easy Focusing: Features a built-in adjustable dew shield mechanism with 25mm of travel for precise focus.
  • Universal Connection: Ready for M42 or 1.25" cylindrical cameras like ZWO Mini, QHY, and others.
  • Ultra-Light: At only 240g, it keeps your payload low without sacrificing stability.
Sleek Space Grey Edition: Matches perfectly with WO Space Grey or Red telescopes. The slide-base fits directly into WO Saddle Handles (no rings required).
Add to Cart
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