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Hi Orestis. I used a Canon EOS 600D with 12" Sky-Watcher Goto Dobsonian and a full aperture Mylar sheet filter. I shot in monochrome "green filter" mode, and then added the colour in Photoshop later. The filter gives an orange colour cast even though the Sun is white.
Derek I have tried an off-axis filter on the 12" previously but found that the clarity wasn't as good for me as the full aperture filter because there seemed to be a bit of directional blurring depending on the positioning of the off-axis aperture. I am still experimenting on the best way to capture the Sun using the Dobsonian and DSLR.
Tom
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