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Chris, if you position the end of your tube further out than the front of the lens you will lessen the chance of off axis light entering and causing reflection artefacts. I had bad reflections until I extended the tube about 6 inches in front of the lens.
Also I have read that the front aperture should be perfectly round without dags as this can cause diffraction artefacts, I have no personal experience regarding this latter phenomena though.
Neale.
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