William Optics

2" Barrel with 90° Viewing Angle 99% Reflectivity Dielectric Coatings 1/12th Wave Precision Polished Mirror 12mm Thick Mirror Substrate for Therma...

Provides a fully corrected, erect image for terrestrial viewing Comfortable 90° viewing angle Standard 1.25" barrel accepts most astronomical eyep...

Converts Astronomical Telescopes for Terrestrial Viewing 90-Degree Viewing Angle Accepts Standard 1.25" Eyepieces Anti-Reflection Coated BAK7 Pris...

40mm Focal Length 72° Apparent Field of View 2" Diameter Barrel 28mm Long Eye Relief Parfocal Design Description FAQ Specifications In the Box ...

50mm Aperture Doublet Lens 200mm Focal Length f/4.0 Focal Ratio 1.25" RotoLock Eyepiece Holder Total Weight: 0.42 kg / 0.93 lbs Description FAQ...

Compatible with William Optics' slide-base guide rings Can be used to make William Optics telescopes portable Description The Wil...

Connects SBIG STL-11000 Series CCD Cameras Attaches to P-FLAT68 Field Flatteners via M80 Female Thread Provides a Precise 69 mm Optical Path Lengt...

1.25" Barrel Diameter 99% Dielectric Coated Mirror 1/12λ Mirror Surface Accuracy 12mm Thick Mirror Substrate 100% Real Carbon Fiber Side Plates ...

32mm Doublet Objective Lens Fast f/3.75 Focal Ratio 120mm Focal Length Integrated Vixen/Synta-Style Slide-Base Ultra-Lightweight at 0.23 kg (0.51 ...

Adds 360° of smooth camera rotation Designed for William Optics 2.5" focusers Secure M63 male and female threads Maintains optical alignment durin...

Length: 400 mm Weight: 1.44 kg / 3.17 lbs Width: 105 mm Dovetail Type: Losmandy D-Style Description FAQ Specifications In the Box Downloads War...

360° of precise framing rotation Standard M54 male and female threads Adds a minimal 30.2 mm to the optical path Securely locks orientation for lo...

120 mm Total Length Patented Handle and Saddle Design Mini-Vixen Dovetail Saddle Includes 50mm Guide Rings 44 mm Width Description FAQ Specific...

Bahtinov mask cover for William Optics GT81 and Z81 telescopes Enhances focusing accuracy for astrophotography Description The Willi...

Provides a fully corrected, upright, and non-reversed image Designed for 1.25" focusers and eyepieces 90° viewing angle for comfortable observing ...

1.25-inch eyepiece with 55° apparent field of view 12.5mm focal length for medium-high magnification viewing Description The W...

Provides a fully corrected image (upright and left-right correct) Comfortable 45° viewing angle for terrestrial observation Fits standard 1.25" fo...

243mm total length Functions as both a carrying handle and an accessory saddle Patented design for rigidity and ergonomics Vixen-style saddle for ...

Solid Copper Construction for Maximum Rigidity M48 x 0.75 Female Thread for Wide-Field Correctors Designed for Nikon Full-Frame DSLR and Mirrorles...

Solid Copper Construction for Maximum Rigidity M48 (2") Female Thread for Wide-Field Correctors Connects to Nikon F Mount Camera Bodies Precise 8....

Patented Bahtinov Mask and Dust Cover Combination Designed Exclusively for the William Optics ZenithStar 61 Durable Metal Construction Signature W...

Fits Dew Shields with Outer Diameters from 243mm to 308mm Generates a Clear Three-Spike Diffraction Pattern for Precise Focusing Essential Tool fo...

Patented Bahtinov mask integrated into a dust cover Precision-cut pattern for accurate focusing Designed for William Optics GT71, Z73, and Star71I...

Designed for Schmidt-Cassegrain Telescopes (SCT) Features a secure RotoLock mechanism for 2" accessories Description The Willi...