Off Axis Guiders
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.
For users of filter focus offsets, a problem occurs when the filter wheel is positioned behind the 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.