Optec Sagitta OAG 3'' Motorized Off-Axis Guider
Optec engineers designed the Sagitta OAG to provide a solution for remote imagers who require the ability to adjust guide camera focus independently of the imaging camera focus.
Robust New Off-Axis Guider for Large Cameras
Featuring a full 3-inch (76.2mm) clear aperture, the Optec Sagitta OAG 3” Manual Off-Axis Guider includes a high-quality fully multi-coated pick-off prism with 12.5mm clear aperture to the guide camera. Sagitta features a large brass split-clamp for attachment of any 1-1/4” format guide camera with plenty of range for setting the guide camera parfocal to the imaging camera. Adjusting the prism stalk height can be accomplished with a single tool and provides prism engagement adjustment of 12mm. Overall, guide camera adjustments exceed 42mm while the OAG body thickness is held at only 31.75mm or 1-1/4”.
Designed as a robust alternative for the OAG market, Sagitta Motorized Off-Axis Guider can be installed and configured for years of unattended use. A new, shorter 3-inch dovetail standard, the OPTEC-3000-S, rounds out the package with a variety of mating adapters. Any required adapter not available from Optec’s expanding inventory can be ordered through Precise Parts (www.preciseparts.com) to complete the camera side or telescope side connections to your imaging gear.
Unique Benefits for Independent Guider Focus
Designed especially with the Lacerta for Lodestar in mind, Sagitta allows slight adjustments to the guider focus for optimal performance with FocusLock continual focusing software. Set the guider focus remotely, perform a calibration run, and you can enjoy continous, perfect focus regardless of temperature or other adverse conditions normally affecting focus. With FocusLock, as long as you’re guiding the primary imager remains in focus.
For users of filter focus offsets, a problem occurs when the filter wheel is positioned behind the Motorized Off-Axis Guider OAG. Applying an offset for non-parfocal filters will keep the primary imager in focus, but the guide camera will be de-focused for that filter. With Sagitta, this effect can be effective reversed in software. As the primary focuser moves out, say 50 microns, the Sagitta can simultaneously be moved inward by the same amount.
Optec’s Sagitta OAG can be purchased with the guider motor attached (#19340) or without the motor for manual guider focus (#19342). The motorized version requires the FocusLynx control hub and is an ideal use of the Focuser 2 port for owners of FocusLynx or FocusBoss II controllers.
For owners of the manual Sagitta OAG, Optec also offers a motor upgrade easily installed with four socket cap bolts. See #19349 for details.
Controller Compatibility
The standard FocusLynx Controller hub can easliy be converted into a Dual-Focus Controller with the addition of the optional Second Stepper Driverboard.
- Optec FocusLynx controller
- Starlight Instruments FocusBoss II controller.
Featuring an easy-to-install board with a double row connector, the Second Stepper Driver pushes directly into the main FocusLynx control board. Full details for the #19533 Secondary Stepper Board are available. Review the video to see how easy converting your FocusLynx into a Dual Focus controller can be.
