After years of R&D we have developed a new solar film that has the optical quality of glass with the advantages of impregnated polymer. Will never develop pinholes or scratches that can let in light and ruin a filter. Other advantages: lightweight and does not require re-balancing tube assembly, will not break, consistent yellow-orange solar image, even density with any aperture, flat surface compared to other thin film filters that have wrinkles and creases. Will not tear or puncture. Stronger than any other solar film on the market.

After years of R&D we have developed a new solar film that has the optical quality of glass with the advantages of impregnated polymer. Will never develop pinholes or scratches that can let in light and ruin a filter. Other advantages: lightweight and does not require re-balancing tube assembly, will not break, consistent yellow-orange solar image, even density with any aperture, flat surface compared to other thin film filters that have wrinkles and creases. Will not tear or puncture. Stronger than any other solar film on the market.

After years of R&D we have developed a new solar film that has the optical quality of glass with the advantages of impregnated polymer. Will never develop pinholes or scratches that can let in light and ruin a filter. Other advantages: lightweight and does not require re-balancing tube assembly, will not break, consistent yellow-orange solar image, even density with any aperture, flat surface compared to other thin film filters that have wrinkles and creases. Will not tear or puncture. Stronger than any other solar film on the market. Also available in sheets. Guaranteed 15 years.

Download Printable Solar Filter Instructions

SolarLite Filter for Telescope, fits ETX90, C-90, Questar 3.5, Wm. Optics ZS80II ED, Orion OBS. 70 & Astroview 90, Orion Explorer 90

After years of R&D we have developed a new solar film that has the optical quality of glass with the advantages of impregnated polymer. Will never develop pinholes or scratches that can let in light and ruin a filter. Other advantages: lightweight and does not require re-balancing tube assembly, will not break, consistent yellow-orange solar image, even density with any aperture, flat surface compared to other thin film filters that have wrinkles and creases. Will not tear or puncture. Stronger than any other solar film on the market. Also available in sheets. Guaranteed 15 years. 

Download Printable Solar Filter Instructions

• Install this motor drive on your AstroMaster or PowerSeeker equatorially mounted telescope and start tracking the stars!
• Right Ascension tracking compensates for the Earth’s rotation
• Can be used in the Northern or Southern Hemisphere
• For Celestron CG-2 and CG-3 equatorial mounts

Fully multi-coated eyepiece

The SLV Series of eyepiece feature a hexagonal shaped eyepiece for adjusting to the most comfortable eye point for viewing. The SLV eyepieces with high grade Lanthanum glass, deliver remarkably clear and high constrast star images to the edge of the viewing circle. The lenses are fully multi-coated for high light transmission.

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)

William Optics ZenithStar 61II Doublet Refracting Telescope - Gold

Features

• 61 mm (2.41-inch) Aperture.
• f/5.9 Focal Ratio.
• 3.2 lb - Travel Telescope for Astrophotography and Wildlife Photography.
• Adaptable with any DSLR.
• This is the Gold Version
• Innovative Bahtinov Mask Cover for Easy Focus Assist.
• Soft Carry Case Included!

• The full-frame sensor size is approximately 36X24.
• A 41 mm diameter image circle.
• The Focuser is 50.8 mm (2-inch), rack and pinion, with 10:1 dual-speed micro focuser and a 75 mm travel length. 
• A rotatable L mounting bracket.
• The tube length has a range of 230 mm when fully retracted, and 300 mm when fully extended.

William Optics ZenithStar 61II Doublet Refracting Telescope - Gray

Features

• 61 mm (2.41-inch) Aperture.
• f/5.9 Focal Ratio.
• 3.2 lb - Travel Telescope for Astrophotography and Wildlife Photography.
• Adaptable with any DSLR.
• This is the Gray Version
• Innovative Bahtinov Mask Cover for Easy Focus Assist.
• Soft Carry Case Included!

• The full-frame sensor size is approximately 36X24.
• A 41 mm diameter image circle.
• The Focuser is 50.8 mm (2-inch), rack and pinion, with 10:1 dual-speed micro focuser and a 75 mm travel length. 
• A rotatable L mounting bracket.
• The tube length has a range of 230 mm when fully retracted, and 300 mm when fully extended.

William Optics All New Slide-base UniGuide 32mm Scope - Gold

The 32 mm UniGuide guide scope from William Optics has a focal length of 120 mm and a focal ratio of f/3.75. The guide scope comes with a Vixen-style slide-base. This base is compatible with the William Optics saddle carry handle and the Cat Handle bar (neither handles are included).

The back of the William Optics 32mm UniGuide scope comes with an M42 thread for attaching 1.25" cylindrical-type guide cameras such as QHY, SBIG, and ZWO cameras. Tightening knobs will ensure a stable fit for the attached guiding equipment.

The WO UniGuide guide scope has a full length of 147 mm. Of that length, the lens to the back of the guide scope is 105 mm. The Vixen slide-base measures 73 mm in length. When it comes to the 32 mm UniGuide Scope's appearance, the beautiful red exterior matches perfectly with other red William Optics refractors and accessories.

Additionally, the body of the guide scope comes with an adjustable distance of up to 25 mm. The design of the body even has a subtle focus mechanism! In order to focus the guide scope, you will need to twist the built-in dew shield. Once you have your desired focus, then you can lock it in with the black ring at the base of the dew-shield.

William Optics All New Slide-base UniGuide 32mm Scope - Space Grey

The 32 mm UniGuide guide scope from William Optics has a focal length of 120 mm and a focal ratio of f/3.75. The guide scope comes with a Vixen-style slide-base. This base is compatible with the William Optics saddle carry handle and the Cat Handle bar (neither handles are included).

The back of the William Optics 32mm UniGuide scope comes with an M42 thread for attaching 1.25" cylindrical-type guide cameras such as QHY, SBIG, and ZWO cameras. Tightening knobs will ensure a stable fit for the attached guiding equipment.

The WO UniGuide guide scope has a full length of 147 mm. Of that length, the lens to the back of the guide scope is 105 mm. The Vixen slide-base measures 73 mm in length. When it comes to the 32 mm UniGuide Scope's appearance, the beautiful red exterior matches perfectly with other red William Optics refractors and accessories.

Additionally, the body of the guide scope comes with an adjustable distance of up to 25 mm. The design of the body even has a subtle focus mechanism! In order to focus the guide scope, you will need to twist the built-in dew shield. Once you have your desired focus, then you can lock it in with the black ring at the base of the dew-shield.