I installed this on my Celestron 8se SC telescope to increase the field of view (because I have a zwo asi224mc camera with a relatively small sensor area). It was easy to install and worked pretty well. Before purchasing I was concerned that the focal plane would move so much that I would not be able to focus within the limits of my focus knob. But that fear was unfounded, and I had no trouble concentrating. I was able to get the Dumbbell Nebula into my camera's field of view with enough contextual background. As far as I could tell, I didn't notice any significant vignetting. My plan is to leave it permanently in the back of the telescope and only use it when observing planets or taking photographs (which requires higher magnification).
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