The new Agena Deluxe Off-Axis Guider (OAG) eliminates the need to piggyback a separate guide scope on your primary telescope to perform guided astrophotography. Instead, the OAG is inserted into the telescope's focuser and the imaging camera is attached to the other end. A 1.25" eyepiece holder on top of the OAG allows you to insert a 1.25" eyepiece to find and center a guide star. A small adjustable prism protrudes into a part of the primary telescope's light path and directs the image of a suitable guide star in the field of view up into the eyepiece. Both the prism's tilt and its rotation around the field of view can be adjusted to locate and center on the desired guide star.
Once the guide star has been located and focused, you can manually guide with the eyepiece or replace it with a guide camera that can then automatically track the guide star. Much greater accuracy is achieved since mechanical flexure inherent in a separate guide scope is eliminated. The astrophotography setup weight is also reduced putting less strain on the tracking mount.
Please note that inward focus travel of at least 59mm is required to achieve focus with this accessory. Use with reflecting telescopes is not recommended since they may not have sufficient focuser travel. Item weight = 7.1oz.
Please note that no instruction sheet is included with this product. However, you can find this info easily on the internet for similar products.
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- Review by Cannon Master of Crestview, FL.