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The ZWO OAG-L is the latest iteration of the M68 OAG with a larger prism size of 12*12mm. 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.
The pictures below show how to remove the sensor tilt plate:
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.
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