OAG-L has a large prism size of 12*12mm, far bigger than M68 OAG. The bigger clear aperture brings wider field of view in guiding. It is easy to use, and suitable for users who are interested in long focal length photography.
To take the most advantage of it, we recommend you to match it with large format guiding cameras.
While adding OAG-L into your optical train, please make sure the prism won’t block the camera sensor.
You can use the guiding screw to adjust the guiding camera’s focus length. Please make sure the distance from the prism to the main camera and to the guide camera are the same. To ensure the result, it is better to do this at daytime for the adjustment will be very difficult at night.