Pegasus Indigo OAG

The primary advantage is the elimination of differential flexure. An OAG uses the same telescope and light path as your main imaging camera, so any mirror flop or mechanical shift is seen by both the guide camera and the main sensor. This results in tighter, rounder stars during long exposures, as the guiding system corrects for the exact movements the imager is experiencing.

The Indigo OAG is very efficient with back focus. The main body is 10.0 mm thick.

• With the telescope adapter attached, it consumes 14 mm of back focus.
• If you use both the telescope and camera adapters, the total thickness is 18.0 mm.
• When paired with the Pegasus Indigo Filter Wheel, the total combined back focus is 33 mm.

To avoid the 12 x 8 mm prism casting a shadow on your large sensor, you need to adjust its height. Loosen the set screw on the side of the OAG body with a 2mm Allen key (not included). This allows you to gently slide the prism housing upwards, moving it out of the main camera's light path. Once positioned just outside the sensor's field of view, tighten the set screw to lock it in place. Hold the housing while the screw is loose: Pegasus warns that loosening the set screw lets the prism housing slide off.

Yes, if your camera or filter wheel uses the 62 mm diameter pattern. The body has 6 x M3 through holes for the 6-hole circular pattern and 4 x M2.5 holes for the 4-hole square pattern. Check the bolt pattern of your camera or filter wheel first; if it does not match, use the M54F and M48F screw-in adapters.

The only difference is the focusing mechanism for the guide camera. This standard version (PEG-INDIGO-OAG) uses a simple 1.25" barrel. The Premium version (PEG-INDIGO-OAGPREM) comes with a helical focuser pre-installed, which allows for much finer and more repeatable focus adjustments. You can purchase the helical focuser separately (PEG-INDIGO-OAGHF) to upgrade a standard OAG later.

Focusing with the standard barrel is a manual process. First, achieve sharp focus with your main imaging camera. Then insert your guide camera in the 1.25" barrel, start looping exposures in your guiding software, and slide the camera in or out until the stars are as small and sharp as possible. If you refocus often, the helical focuser upgrade (PEG-INDIGO-OAGHF) makes this a turn of a ring.

Yes. The 12 x 8 mm prism is fully multicoated and anti-reflection treated, and Pegasus specifies it for high illumination of the guide camera, with round, bright stars across the OAG's field. If stars look dim or clipped, raise or lower the prism to find the best-lit position at the edge of your imaging field.

The included M54 and M48 adapters are attached with three M3 bolts in slotted holes. Loosen them, set the rotation angle you want, and tighten them again. This sets where the pick-off prism sits around your field, so you can reach a richer patch of guide stars. Plan it together with your camera framing, since everything behind the telescope adapter turns with it.

To leave enough clearance for the helical focuser, you must install the Pegasus adapter PEG-ADAPT-M68M-M54M-20 between the Falcon Rotator v2 and the Indigo OAG. Always confirm your total back focus budget can accommodate this additional spacing.

No, the Indigo OAG is not waterproof. It is made from corrosion-resistant 6061 aluminum alloy, but it should be kept in a clean, dry environment to protect the optical prism and mechanical components. If the prism needs cleaning, use medical-grade cotton and a dedicated optical cleaning solution.