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Hi Andrew, I am using Baader ND3.8 solar imaging film, it allows you to use fast frame rates to help combat the turbulence in the atmosphere. The green filter combined with an IR cut filter helps to cut out other wavelengths and concentrate your imaging around the 540nm wavelength to increase contrast. I haven't tried it but some people use a red filter.
A lot depends on the seeing some days the turbulence in the atmosphere makes solar imaging almost impossible to get good results.
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