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Focusing for HA
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05-05-2010, 10:30 PM
Tandum
(Robin)
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Join Date: Apr 2008
Location: Wynnum West, Brisbane.
Posts: 4,161
Trevor, Just put the filter in and plonk the mask on the front of the scope and up binning to 2x. Draw a box around the brightest star in the image and get a sub image and then increase exposure time till you see the lines from the mask. Now focus.
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