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Andy,
I have a glass filter for solar observing and the sun is a white disk with dark spots for the sun spots. It does not show flares, etc as you need to get into the Ha stuff for that.
Make sure any filter you use is one that goes over the front aperture and NOT AN EYEPIECE ONE. Also leave all finder scopes capped or, better still, remove them completely when observing the sun.
Cheers
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