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Here are a couple of test comparisons. The first is 30 seconds luminance through the Borg 55FL (200mm focal length) and the second is 60 seconds of Ha. The star selected is not especially bright. The three images in both cases are 1. Bahtinov mask, 2. Y mask (thin strips of material), 3. Negative Y mask (thin strips of no material.)
In the case of the lum the scope is fairly close to good focus. For the Ha the focuser was left in the same position but is not well focused with the Ha filter.
Cheers,
Rick.
Last edited by RickS; 27-11-2018 at 08:09 PM.
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