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I bought the Hotech field flattener for my Skywatcher ED80. Sharp to the edge. It's not a reducer as I didn't want objects to be smaller than they already are. The ED80 already has a wide field of view.
I don't use any filters for my photography as I found little or negative benefit when using my Sony a6000. Instead the image processing using Deepskystacker and Photoshop does a much better job of removing the effects of light pollution.
Jim
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