Manufacturers & Suppliers of Astronomical Telescopes in India Serving Amateur Astronomers Since 1976
Manufacturers & Suppliers of Astronomical Telescopes in India Serving Amateur Astronomers Since 1976
This is a large off-axis guider designed to split off a small portion of your telescope’s light path to a guide camera for auto-guiding while imaging with your main camera. It’s especially aimed at long focal-length astrophotography setups.
🚀 Typical Use Cases
Astrophotographers using long focal length telescopes who want precise tracking for long exposures.
Setups with ZWO ASI cameras and filter wheels, especially where field of view from a smaller OAG might be limiting.
Eliminates need for a separate guidescope — helps reduce flexure and alignment issues.
⚙️ Notes / Compatibility
Works best with ZWO ASI Mini guide cameras (e.g., ASI174MM Mini, ASI290MM Mini).
Recommended for telescopes with threads matching M48 and for use with 2″ or 36 mm filter wheels without vignetting.
The OAG-L-68 version is essentially the large prism design optimized for larger sensors and filter wheels like the ASI461MM Pro.
🔍 Key Features
Large 12 × 12 mm prism — much larger than typical OAG prisms, giving a wider field of view for guiding.
Effective light-pass aperture ~11.7 × 8.3 mm — helps capture enough guide stars for accurate tracking.
Thin profile (~17.5 mm thickness) — helps maintain correct backfocus distances in imaging train.
Can connect main camera and guide camera simultaneously — no separate guidescope needed.
Includes M48 sensor tilt plate (5 mm) — can help correct slight tilt between guide and imaging cameras.
Designed for use with ZWO gear like ZWO ASI guide cameras and often paired with the ZWO ASI461 versus standard OAG-L setups (OAG-L-68 variant is optimized for that).
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STARTRACKER [ India ]
EXPLORE SCIENTIFIC [ USA ]
G.S.O. [ Taiwan ]
Goto Mounts / Tripods [ U.S.A ]
BRESSER [ Germany ]
William Optics [ Taiwan ]
DWARF LAB [ China ]
MEADE / SKYWATCHER [ U.S.A ]
CELESTRON [ U.S.A ]
S V Bony [ China ]
ZWO [ China ]
EYEPIECES & ACCESSORIES
HD CAMERA & AUTO GUIDERS
Guide Scopes [ China ]
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