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If you have access to a Canon 100-400L lens, the solar filters that fit an ED80 refractor fit perfectly into the end of the lens hood!
This may be able to be repeated for other standard filters that fit into the end of refractors, may also fit inside the end of your lens hood. Measure the inside diameter of your lens hood and see if you can find a match.
Worked quite well for the Transit Of Venus hand held, and have been able to image a couple of spots quite well when tripod mounted.
Of course taping it on is highly recommended!
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