Products

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 Native Focal Ratio 44mm Full-Frame Image Circle Integrated Field Flattener 2.86kg Gro...

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

6nm Dual-Bandpass Filter Set Includes D1 (Hα+OIII) and D2 (SII+OIII) Filters Enables SHO-like imaging with color cameras High contrast for light-p...

Dual-Bandpass: 8.5nm H-alpha & 6.5nm OIII Peak Transmittance: >85% at 500.7nm and 656.6nm Light Pollution Suppression: ≥OD5 blocking from 2...

Dual-band filter passing OIII (6.5nm) and SII (8.5nm) wavelengths Peak transmittance of 85% for maximum signal capture Designed for color cameras ...

71mm Aperture Quadruplet APO Optical Design 490mm Focal Length at f/6.9 44mm Full-Frame Corrected Image Circle Integrated Field Flattener 3.0kg To...

560mm Focal Length f/7 Focal Ratio Triplet Objective with ED Glass APS-C Corrected Image Circle 55mm Back Focus 0.42kg Weight Description FAQ S...

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

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...

Dual-band filter passing SⅡ (672nm) and OIII (500.7nm) emission lines Designed for one-shot-color cameras to capture data often missed by Hα/OIII ...

Losmandy D-Series Profile Universal Hole and Slot Mounting Pattern Flexible Accessory Integration Solid, Flex-Free Connection Description FAQ S...

300mm Overall Length Universal D-Series (Losmandy-style) Profile Slotted and Tapped Mounting Holes Designed for Tube Rings and Guide Scopes Provid...

400mm Length D-Series (Losmandy-style) Profile Universal Hole and Slot Pattern Connects Tube Rings and Accessories Solid, Flex-Free Mounting Platf...

135mm Focal Length f/4.5 Focal Ratio 30mm Aperture Sextuplet APO Optical Design 280g Total Weight Description FAQ Specifications In the Box Dow...

40mm Aperture Sextuplet APO Lens 180mm Focal Length at a Fast f/4.5 44mm Image Circle for Full-Frame Sensors Standard 55mm Back Focus with M48x0.7...

Corrects focal plane tilt without altering back focus Maintains a constant 18mm optical thickness Provides a ±1° adjustment range Features M54 fem...

60mm Aperture Quintuplet APO Astrograph 300mm Focal Length at a Fast f/5 Focal Ratio 44mm Full-Frame Image Circle Integrated Petzval Corrector Des...

72mm Aperture Quintuplet APO Lens 400mm Focal Length at f/5.6 44mm Full-Frame Image Circle 140mm Available Back Focus 3" Rack-and-Pinion Focuser w...