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The flattener is for photography - not particularly useful for visual on such a small scope.
The point is that the focal plane of refractors is curved, like a sphere but the sensor in a camera is flat so it can’t get it all in focus simultaneously. The flattener corrects this curvature.
For visual however the eye will tolerate this and most eyepieces aren’t designed with a flat field in mind anyway so a flattener doesn’t have much point for visual users.
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