Products

Reduces focal ratio to a fast f/3.9 0.7x reduction factor 44mm image circle fully illuminates full-frame sensors Standard 55mm back focus for easy...

203mm Aperture Triplet Air-Spaced APO Objective 1421mm Focal Length at f/7 Includes one ED (Extra-Low Dispersion) Glass Element Retractable Tube D...

2-inch Barrel Diameter High-Reflectivity Dielectric Mirror Coating Accepts both 2" and 1.25" Eyepieces Compatible with SCT and Refractor/Reflector...

Reduces FRA600 focal ratio to F/3.9 Designed for full-frame sensors Maintains a standard 55mm backfocus Features integrated M48 (2-inch) filter th...

32mm Aperture 128mm Focal Length (f/4) Contains One ED Glass Element Precision Helical Focuser Weighs only 303g Description FAQ Specifications ...

Enables SHO "Hubble Palette" imaging with a one-shot-color (OSC) camera Includes two ultra-narrow dual-bandpass filters: E1 (Hα+OIII) and E2 (SII+...

Dual-bandpass for Hydrogen-alpha (656.6nm) and Oxygen-III (500.7nm) Ultra-narrow 3.7nm (Ha) and 4.0nm (OIII) FWHM bandwidths 85% peak transmittanc...

Dual-bandpass design captures OIII (500.7nm) and SII (672nm) simultaneously Narrow 3.7nm (OIII) and 4.0nm (SII) FWHM for high-contrast imaging Pea...

Enables automated focusing for the Askar 50P astrograph Compatible with almost all brands of electronic focusers Eliminates manual focus adjustmen...

50mm Aperture Quadruplet APO Optics Ultra-Fast f/3.8 Focal Ratio 190mm Focal Length Natively Flat Field for APS-C Sensors Standard 55mm Back Focus...

Aperture: 52mm Focal Length: 208mm Focal Ratio: f/4 Focuser: Helical with 25mm travel Weight: 631g Description FAQ Specifications In the Box Do...

52mm Aperture 249.6mm Focal Length (f/4.8) Air-Spaced Doublet Objective Lightweight 0.74kg Design Includes M42x0.75 and 1.25" Adapters Descript...

0.75x Focal Reduction Reduces Focal Length to 311mm Creates a Fast f/5.1 Focal Ratio 44mm Full-Frame Image Circle Standard 55mm Back Focus Triplet...

60mm Aperture Quadruplet APO Optics 408mm Focal Length (f/6.8) 44mm Full-Frame Corrected Image Circle Integrated Field Flattener 2.4-inch Dual-Spe...

65mm Aperture Quintuplet APO Optical Design 416mm Focal Length at f/6.4 Built-in Field Flattener with a 44mm Image Circle 2.8kg Total Weight Inclu...

71mm Aperture Quadruplet Air-Spaced APO 490mm Focal Length at f/6.9 44mm Full-Frame Corrected Image Circle Integrated Field Flattener Design 2.4-i...

80mm Aperture 560mm Focal Length (f/7) Doublet Objective with ED Glass 1.7 kg OTA Weight 2" Dual-Speed Rack & Pinion Focuser Optimized for APS...

80mm Aperture 600mm Focal Length (f/7.5) Quadruplet APO Optics with 2 ED Elements 44mm Full-Frame Corrected Image Circle 3.9kg Optical Tube Weight...

Reduces focal ratio to a fast f/5 0.75x reduction factor for wider fields of view Triplet optical design provides field-flattening correction Stan...

91mm Aperture Quadruplet APO Optics 609mm Focal Length at f/6.7 44mm Full-Frame Corrected Image Circle Integrated Field Flattener Design 3.92kg Ne...

Adds electronic autofocus capability to the Askar ACL200 lens Designed for seamless integration with ZWO EAF and other electronic focusers Include...

Enables Electronic Autofocus on the Askar FMA180 Pro Designed for Seamless Integration with ZWO EAF Broadly Compatible with Most Electronic Focuse...

Complete 2-Filter Narrowband Solution for Color Cameras Captures H-alpha, Oxygen-III, and Sulfur-II Wavelengths Filter 1 (C1): Hα + OIII Duo-Band ...

Dual-bandpass filter for H-alpha (656.6nm) and Oxygen-III (500.7nm) Asymmetrical bandwidths: 15nm for H-alpha, 35nm for OIII Greater than 90% peak...