I recently purchased a $32 piece of 8″ Baader Astrosolar filter film to use on my 10″ Zhumell Z10 Dobsonian telescope. Here’s how I made an on-axis filter cell that fits like a glove and works like a dream, for free, using cardboard scraps and packing tape:
DONE:
And, a cover, using the shipping cardboard from the film:
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