Solar Filter Advice

Please would someone be able to give me some advice on Solar Filters. I have
a Celestron Nexstar 5i telescope and currently use a Celestron Astro filter
(Plastic mount with foil material). I used this to photograph the transit of
Venus yesterday. The images were basically showed a whitish disc, sunspots
visible but little other detail. My query is this, are there other types of
filter available ? Ones which perhaps block the sun's centre to show the
outer rim for example or will show greater surface detail / features.
Material wise is glass or other more sturdier material available. Any web
site info appreciated....

Many Thanks

Richard
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Richard Griffith
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