OGMA OAG M48 Off-Axis Guider with Helical Focuser and 1.25" Holder
The OAGM48 Off-Axis Guider is a crucial instrument that allows astrophotographers to use the same telescope for guiding and imaging.
After adding the OAGM48 to your imaging train, the 10x10mm prism inside the Off-Axis Guider will redirect a portion of the star field that usually doesn't fall on the primary camera sensor to a guiding camera inserted into the 1.25'' holder.
This Off-Axis Guider has an M48 thread on the side of the telescope and multiple tapped holes on the side of the camera. These holes are designed to match most filter wheels currently available in the market.
Highlights
10x10mm Prism:
Reasonably sized, keeps costs low, and gets the job done.Slim 17.5mm Backfocus Consumption:
Designed to preserve critical backfocus, allowing seamless integration into most imaging setups.Flexible Installation:
Can be used with or without a filter wheel. If you are not using a filter wheel or filter drawer, a 20mm width spacer is included to maintain proper back focus between the imaging and guiding cameras.M48 and M54 threads:
Includes two interchangeable mounting plates with M48x0.75 and M54x0.75 threads on the telescope side, ensuring broad compatibility with reducers, flatteners, and other accessories.Smooth Helical Focuser:
Provides precise and easy focusing of the guide camera for sharp, accurate guiding.Adjustable Prism Position:
Allows you to fine-tune the prism height for maximum performance without vignetting your primary sensor.Included Focuser Riser:
A riser can be installed between the OAG body and the helical focuser to increase the focuser's distance from the optical center, especially useful when extra clearance for accessories is needed.Durable, Lightweight Construction:
Machined from high-quality aluminum for maximum stability without unnecessary weight.
The OAG M48 is the perfect solution for astrophotographers seeking precision guiding in a compact, flexible, and low-cost package. Its reasonably sized prism, slim profile, and versatile mounting options make it ideal for diverse setups, with or without filter wheels. The OAG M48 ensures accurate, stable guiding without compromising your optical train.
Install
Refer to the online product manual for diagrams, photos, and videos on how to install the OAG
Included Adapter
Generally, a filter wheel or filter drawer is placed between the OAG and the camera. However, if you are not using either, you can install the included 20mm adapter/extender to maintain equal backfocus between the imaging and guiding cameras.
The adapter has an internal M48x0.75 thread, allowing you to either install a 2-inch mounted filter directly inside it or connect it to a camera (or another adapter) that has an external M48x0.75 thread.
Installation
In the last part of this video, you can see how the OAG is connected to a filter wheel.
If you don't have a filter wheel and want to use the OAG, we recommend using the OGMA Universal Filter Drawer in place of the filter wheel. It is the easiest way to ensure that the OAG's prism will be placed correctly.
Warranty
OGMA warrants your product to be free from defects in materials and workmanship for one year. OGMA will repair or replace a product or part which, upon inspection by OGMA, is found to be defective during one year following the date that you receive the equipment.
For specific details, read OGMA's limited warranty.