• The ultimate portable astrophotography telescope with Bahtinov mask built into the cap for quick and easy focusing.

• 43 mm image circle is perfect for full-frame cameras in this 51 mm aperture petzval refractor. 
• The f/4.9 focal ratio allows for fast light-gathering power on this wide-field telescope.
• Includes the Iconic Soft Cat Carry Case.

William Optics UniGuide 50mm Slide-Base Guide Scope with 1.25" RotoLock - Red - 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 Red 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)

William Optics Guide Star 61 APO

(Soft Carry Case included)

• Provides a full-frame image circle
• Rotatable 2" manual drawtube for coarse focusing
• Rotating dewshield for fine focusing
• Comes with a free high-quality soft case

• A gold plate to match your other gear!
• Dual-sided dovetail plate with V-style and Arca Swiss dovetails.
• Length:  245 mm (9.64-inches).
• Width top: 38 mm (1.496-inches.)
• Width bottom: 41.7 mm (1.641-inches. 

• A red plate to match your other gear!
• Dual-sided dovetail plate with V-style and Arca Swiss dovetails.
• Length:  245 mm (9.64-inches).
• Width top: 38 mm (1.496-inches.)
• Width bottom: 41.7 mm (1.641-inches. 

• A red plate to match your other gear!
• Dual-sided dovetail plate with V-style and Arca Swiss dovetails.
• Length:  245 mm (9.64-inches).
• Width top: 38 mm (1.496-inches.)
• Width bottom: 41.7 mm (1.641-inches. 

William Optics Losmandy Style Type D Dovetail Bar (Swan Series)

Made with a high-precision CNC and anodizing process, this dovetail from William optics are sleek, durable, and guaranteed to keep your equipment safe and sturdy.

• Weighs 3.1 lbs
• 40 cm in length

William Optics Losmandy Style Type D Dovetail Bar (Swan Series)

Made with a high-precision CNC and anodizing process, this dovetail from William optics are sleek, durable, and guaranteed to keep your equipment safe and sturdy.

• Weighs 3.1 lbs
• 40 cm in length

New Adjustable Flat6All (T-mount not included)

PRODUCT DESCRIPTION: Field flattener / X0.8 Reducer. 

This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7.5 ratio refactors. WO Flat 6All will provide good illumination and flat field across 97% of full frame sized sensors.

Full frame size 
• Designed with nearly Full frame chip-size DSLR cameras in mind. 
• FMC tripllet APO design.
• Produced entirely with the best Ohara optical glasses. 

Amazing

• Reducing factor 0.8X.
• Adjustable design, for perfect back focus it can be used with other models of refractor
• 48mm filter ready

Superb Finish
• William Optics polished anodized finish.
• All internal surfaces threaded and blackened to prevent reflections.

Easy to Use  
• Will accept any standard 48mm T-ring for your camera.

Suitable for
• GT71, GT81, Z103, Z126.

The 48 mm T-mount for Sony E-mount in Black adapter, by William Optics:

This high-precision T-mount adapter has 48 mm threads with outer hard black color anodizing and is made from high-quality aluminum material. It has been machined by CNC for a perfect fitting!

William Optics High Latitude Vixen Style Base Mount -Red

• Upgrade to the iOptron SkyGuider Pro and Sky-Watcher Star Adventurer Mounts for perfect stability and latitude adjustments.
• Lightweight mount design.

• The SLR lenses focal distance is recommended for 60mm or more.
• It is specially designed Astro-Adapter M48-M56 P0.75mm for telescope adapter connecting Astro filter. CNC Machining is used in precisely manufacturing metal parts. Anodizing Aluminium process could reduce the reflection for image.
• STC Astro-Multispectra filter can reduce the interference from artificial lighting in the city ,and enhance the wave length of Hα, Hβ, OIII and SII.
• It is coated by the use of the IBAD (Ion beam-assisted deposition) technology on Schott® B270 optical 2mm glass, working for higher durability and easily cleaning, and preventing aging variation in optical spectral characteristics due to temperature and humidity change.
• High-quality double-sided NANO Anti-smudge coating build excellent performance on waterproof and grease-proof.
• Matte black anodized and Teflon-coated frame design eliminates flare and easy to install or remove from your lens.
• This product is an interference filter. Its spectrum characteristics will be subject to the incidence of incoming light.
• Directly shooting on strong light would effect the image performance due to the light interference and reflection.

Gran Turismo 81 , f/5.9 OTA. FPL53 three-element APO, 2.5” R&P Focuser in Space Gray

• GT81 APO
• 2" & 1.25" Adapter Included
• Bahtinov Mask Included
• STM Multi-Coated Lenses
• f/5.9
• This is the Space Grey version

Optical Performance

The Gran Turismo 81 is a Three Element Designed APO refractor. Using FPL-53 glass this telescope provides excellent aberration correction.

Details and Features

2.5" R&P Focuser

The 2.5" R&P Focuser is smooth, stable, and reliable! No image shifting!

New Designed Rotator

William Optics designed camera angle rotator. Smooth and stable.

CNC Handle Bar

Made by CNC with anodizing. Strong and nice look!

Bahtinov Mask

World first built in clear Bahtinov mask!

Step up your astrophotography game with the William Optics RedCat 91, an advanced apochromatic refractor tailored for full-frame and medium-format cameras. This latest addition to the RedCat series combines portability with superior optical performance, making it a versatile tool for capturing breathtaking detail in deep-sky objects.

Highlights:

Petzval Design, No Backfocus Hassles
The 5-element Petzval design eliminates the need for backfocus adjustments, providing sharp, edge-to-edge images with pinpoint stars—ideal for wide-field and detailed astrophotography alike.

Full-Frame & Medium-Format Ready, No Extra Flattener Needed
With a large 55mm image circle, the RedCat 91 is perfect for both full-frame and medium-format cameras. Its advanced optics achieve flat-field images without requiring an additional flattener, giving astrophotographers the freedom to capture expansive views with unparalleled clarity.

Fast f/4.9 Focal Ratio
The RedCat 91's fast f/4.9 focal ratio is designed for bright, vivid captures of galaxies, nebulae, and beyond, ensuring excellent light-gathering power and sharp detail even on faint celestial objects.

Seamless WIFD Focusing
Equipped with William Optics' WIFD focuser, the RedCat 91 provides precise, stable focusing without additional adjustments, enhancing the ease of use for both seasoned astrophotographers and beginners.

The RedCat 91 blends the trusted RedCat heritage with William Optics’ innovative design, making it the ultimate choice for those ready to elevate their night-sky explorations.

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.

Gran Turismo 81 , f/5.9 OTA. FPL53 three-element APO, 2.5” R&P Focuser in Gold

• GT81 APO
• 2" & 1.25" Adapter Included
• Bahtinov Mask Included
• STM Multi-Coated Lenses
• f/5.9
• This is the Gold version

Optical Performance

The Gran Turismo 81 is a Three Element Designed APO refractor. Using FPL-53 glass this telescope provides excellent aberration correction.

Details and Features

2.5" R&P Focuser

The 2.5" R&P Focuser is smooth, stable, and reliable! No image shifting!

New Designed Rotator

William Optics designed camera angle rotator. Smooth and stable.

CNC Handle Bar

Made by CNC with anodizing. Strong and nice look!

Bahtinov Mask

World first built in clear Bahtinov mask!

Gran Turismo 81 , f/5.9 OTA. FPL53 three-element APO, 2.5” R&P Focuser in Red

• GT81 APO
• 2" & 1.25" Adapter Included
• Bahtinov Mask Included
• STM Multi-Coated Lenses
• f/5.9
• This is the Red version

Optical Performance

The Gran Turismo 81 is a Three Element Designed APO refractor. Using FPL-53 glass this telescope provides excellent aberration correction.

Details and Features

2.5" R&P Focuser

The 2.5" R&P Focuser is smooth, stable, and reliable! No image shifting!

New Designed Rotator

William Optics designed camera angle rotator. Smooth and stable.

CNC Handle Bar

Made by CNC with anodizing. Strong and nice look!

Bahtinov Mask

World first built in clear Bahtinov mask!

William Optics RedCat 51 Gen 2 f/4.9 APO Refractor Telescope - L-RC51II

• The ultimate portable astrophotography telescope with Bahtinov mask built into the cap for quick and easy focusing.

• 43 mm image circle is perfect for full-frame cameras in this 51 mm aperture petzval refractor. 
• The f/4.9 focal ratio allows for fast light-gathering power on this wide-field telescope.
• Includes the Iconic Soft Cat Carry Case.

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)

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)