Optical Accessories

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...

1.25-inch eyepiece with 72° apparent field of view 9mm focal length for high-magnification, wide-field viewing Description The...

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 ...

ZWO 1/3″ 2.1mm 150 degree lensTechnical Parameter:Format support: 1/3″ sensorFocal length: 2.1mmWide angel: 150 degreeMatch Model：ASI120mm, ASI120m...

ZWO 2.5mm 170 degree lensTechnical Parameter:Format support: 1/2″ sensorFocal length: 2.5mmWide angel: 170 degreeMatch Model：ASI178MM, ASI178MC, AS...

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...

Shortens the Focal Ratio of the FF107APO & FF130APO Focal Ratio shortened to f/4.9 Reduces th...

Shortens the Focal Ratio of the FF65APO Focal Ratio from f/6.4 to f/4.8 Reduces the Focal Length to 312mm Reduction Factor of 0.75x Standard 55mm ...

Shortens the Focal Ratio of the FF80APO Focal Ratio from f/7.5 to f/5.7 Reduces the Focal Length ...

ZWO filter masks are used for ZWO filter wheels.Please use the M2 screws and masks to fix the filters:⚫ Remove the screws securing the back cover a...

ZWO 1.25″ IR 850nm Pass Filter suitable for IR sensitive cameras. You don’t need to debayer and get the full resolution of this sensor when use it ...

UV IR-CUT Protective WindowZWO D21 UV IR-CUT protect windowTechnical Parameter:Diameter: 21mmType: UV IR-cut windowThickness: 1.1mmFlatness: 1/4 λM...

The new ZWO LRGB Filters are designed to approximately equalize the flux of ASI1600 mono sensorBetter transmission, Better coating, Better color...

7nm Bandpass for Precision Imaging Enhanced Nebula Imaging Light Pollution Suppression ...

7nm Bandpass for Precision Imaging Enhanced Nebula Imaging Light Pollution Suppression ...