Products

Enables use of standard 2-inch (M48 x 0.75) filters Connects to the M44.5 x 0.75 objective threads on Cat Eyes Binoculars Adds a minimal 6 mm of o...

Connects M48 Threaded Accessories to 2" Push-in Focusers Female M48 Threads for 2" Filter Attachment Adds a Fixed 36 mm of Optical Length Male M48...

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...

Connects P-FLAT6AIII Flattener to 2" Focuser Female M63 Threads for Flattener Connection Male 2" Push-in Barrel for Focuser Internal M48 Female Th...

Adds 80mm of Optical Length Connects to M63 Female Threads Outputs to M48 Male T-Threads Enables Focus Without a Field Flattener Designed for Will...

Connects William Optics FLT91 Telescope to Flat6AIII Flattener Input Thread: M92 Male Output Thread: M63 Female Optical Path Length: 10.5 mm De...

Connects M48 Correctors to Olympus Micro 4/3 Cameras Fixed 35.6 mm Optical Length for Precise Back Focus Light-In Connection: M48 (Female) Thread ...

71mm Aperture, 230mm Focal Length, f/3.2 43.2mm Full-Frame Image Circle 7-Element EVO Optical Design with Super ED Glass WIFD Internal Rack and Pi...

51mm Aperture Diameter 178mm Focal Length f/3.5 Focal Ratio 6-Element Petzval Optical Design 43.2mm Full-Frame Image Circle WIFD Rack & Pinion...

Adapts the Mortar pier head to a mount with a 3/8" thread. 3/8" mount thread 2-year warranty Description Warranty The William O...

Allows for simple installation Made with improved CNC for greater rigidity Description The William Optics ZenithStar V1 Upgrade Mounting Rin...

Designed specifically for the William Optics ZenithStar 61 I Provides a secure, rigid mounting point for the optical tube Features an integrated C...

Precise 90mm Inner Diameter Solid, All-Metal Construction Secures Optical Tube for Astrophotography Requires User Measurement for Fit Confirmation...

Provides critical clearance for cameras and filter wheels Improves balance options for complex imaging trains Made in versions for specific Willia...

90 kg (198 lbs) Loading Capacity Lightweight 7 kg Aluminum Alloy Construction 100 mm (4") Diameter Pillar for Maximum Rigidity Includes 3/8" Adapt...

111mm Aperture 7-Element Astrograph 528mm Focal Length at a fast f/4.8 45mm Image Circle for Full-Frame Sensors William Optics Internal Focus Desi...

181mm Aperture 998mm Focal Length (f/5.5) 7-Element Optical Design with 3 Super ED Glass Elements 55mm Corrected Image Circle 4.1-inch Rack & ...

68mm Aperture 7-Element Astrograph Fast f/3.8 Focal Ratio 260mm Focal Length 48mm Full-Frame Image Circle 2.98 kg (6.57 lbs) Optical Tube Patented...

Focuser for 12 to 16 inch William Optics and GSO Ritchey-Chrétien telescopes Optional 0.8x RC reducer flattener, not included (William Optics of...

Red dot finder for easy target acquisition Includes Vixen-style mounting base for versatile attachment Description The William...

51mm Aperture 250mm Focal Length (f/4.9) 4-Element Petzval-like Optical Design 45mm Full-Frame Image Circle William Optics Internal Focus Design (...

61mm Aperture f/4.9 Focal Ratio / 300mm Focal Length 4-Element Petzval-like Optical Design with FPL-53 Glass 45mm Full-Frame Corrected Image Circl...