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barlow trouble
Friends, I have a Celestron Omni 150/750, multi coated eyepiece 25mm and 2x Barlow lens. When collate eyepiece and barlow lens I can't sharpen an image, in fact, if focuser longer it could be possible. In order to sharp it focuser must go down to the secondary mirror. Is barlow bad or it can not be paired with the 25mm eyepiece? Thanx
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