urbanimager If you have EdgeHD 11 and ASI174MINI, OAG-L is recommended.
OAG has a small prism and will have vignetting when working with ASI174MIN, and due to the small FOV, it's hard to find guide star, changing to OAG-L with a large prism will improve the problem.
In addition, also need to pay attention to if there is a 55mm back focus length solution with your devices.
What EFW do you have? OAG-L only can be connected to EFW by the screw holes, there is no thread on the camera side.
Here are some connection ways for your reference.
https://astronomy-imaging-camera.com/tutorials/best-back-focus-length-solutions-55mm/
