I used a blue filter to observe Jupiter after focusing the telescope's eyepiece with Celestron's original 9mm eyepiece. Before the filter I could see Jupiter's clouds etc. After installing the filter almost everything was blurry, the blurry image was created after refocusing the telescope. Most importantly, the filter box is very thin. Constantly falls off - offer to make the filter box round and screw the screws to the box. Overall not that happy with the product.
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