Sky-Watcher HAC125 DX OTA Honders Advanced Catadioptric 125/250 f/2 Optical Tube (Sky-Watcher, SKU: SW-1337) is a compact astrograph designed for modern wide-field astrophotography. The Honders Advanced Catadioptric optical system combines refractive and reflective elements, offering a 125 mm aperture, 250 mm focal length and a very fast f/2 focal ratio. The DX version has been optimized for use with astronomical cameras featuring sensors up to 16 mm in diameter, providing a well-corrected image field and high sharpness across the frame.

Key features

• Honders Advanced Catadioptric optical system designed for wide-field astrophotography
• 125 mm aperture and 250 mm focal length
• very fast f/2.0 focal ratio for shorter exposure times
• optimized image field for sensors up to 16 mm in diameter
• rear focusing system based on primary mirror movement
• compact and lightweight design for transport and field use
• Vixen dovetail rail

Box contents

• Sky-Watcher HAC125 DX OTA optical tube
• Vixen dovetail rail

Technical specifications

• item number: SW-1337
• optical design: Honders Advanced Catadioptric
• aperture: 125 mm
• focal length: 250 mm
• focal ratio: f/2.0
• optical tube weight: 3.8 kg
• tube length: 360 mm
• focuser size: 1.25"
• fine focuser control: no
• illumination circle: 16 mm
• dovetail rail: Vixen
• warranty: 60 months

The Sky-Watcher HAC125 DX OTA is a specialized optical tube for fast deep-sky imaging, combining a compact design with an f/2 system for efficient wide-field astrophotography in mobile setups.