Optical Accessories

High-quality 1.25" diagonal for refractor and catadioptric telescopes 99% reflectivity dielectric coating for maximum light transmission ...

High-quality 2" diagonal for refractor and catadioptric telescopes 99% reflectivity dielectric coating for maximum light transmission ...

Adjustable field flattener specifically designed for the William Optics Z61 telescope Improves edge-to-edge sharpness for astrophotography w...

Versatile field flattener for William Optics refractor telescopes Adjustable design for optimal performance with various camera setups ...

0.8x reducer For William Optics FLT91 refractor Description The William Optics Adjustable Flat6AIII for FLT91 is a special editio...

Improves edge-to-edge sharpness for astrophotography 43mm image circle Adjustable design 66.2mm back focus Description Specifications In the Bo...

Adjustable reducer and field flattener for William Optics Z61 telescope Improves image sharpness and reduces distortion Description ...

Adjustable reducer and field flattener for William Optics Z73 telescope Improves image sharpness and reduces distortion Description ...

Enhances visual astronomy with comfortable two-eye viewing Complete package includes binoviewer, eyepieces, and accessories Descriptio...

Designed specifically for William Optics 68mm f/6 refractor telescopes Corrects field curvature for improved edge-to-edge sharpness De...

1.25" erecting prism for correct image orientation Silver-finished design specifically for RedCat telescopes Description The W...

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

Dual-bandpass filter for astrophotography Optimized for H-alpha and OIII emission lines Description The William Optics STC Ast...

Multi-bandpass filter for astrophotography 48mm thread-on design for easy attachment Description The William Optics STC Ultra ...

2-inch eyepiece with 72° apparent field of view 40mm focal length for wide-field, low-magnification viewing Description The Wi...

0.72x reducer/flattener for William Optics refractor telescopes Reduces focal length and corrects field curvature for improved astrophotogra...

0.8x reducer/flattener for William Optics refractor telescopes Reduces focal length while correcting field curvature Description ...

Focal Length: 2.1mm Field of View: 150° (on 1/3" sensor) Aperture: f/2.0 Mount: CS-Mount Sensor Compatibility: 1/3" format cameras Description ...

Focal Length: 2.5mm Field of View: 170° Diagonal Aperture: f/1.2 Mount: CS-Mount Standard Format: 1/3" Sensor Coverage Description FAQ Specific...

AR Protective WindowZWO D21 AR protect windowTechnical Parameter:Diameter: 21mmType: AR windowThickness: 1.1mmFlatness: 1/4 λProtect the sensor fro...

ZWO ADC is voted as “ HOT SKY PRODUCT – 2017” by SKY&TELESCOPE magazine! Specifications

The ZWO Methane band (CH4) filter is a special filter for photographical use.Its FWHM is 20nm which is suitable for most IR sensetive color or mono...

2.8mm-12mm F1.4 lens is suitable for ASI120MM/MC，ASI290MM/MC and ASI224MCThis lens has bigger diameter than the 2.1mm lens come with ASI120MM/MC.It...

ZWO Duo-Band Filter is a dual narrowband filter primarily aimed at complementing our range of colour ASI cameras. The Duo-Band filter is aimed at t...