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For solar viewing, as Allan says, you will always need a energy -rejection filter. In addition to this you can use other filters and I use a solar-continuum filter, which screws into the back of the eyepiece. It's green, which is the area of peak emission from the photosphere. It is no where near as good as a Ha scope and prominences are completely invisible but it does improve surface detail, especially around sunspots, compared to white-light viewing. They are also pretty cheap.
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