I'd like to find a good solar filter that is not too expensive (<$150), which can be used to view not only transits, but also see features like sunspots and maybe granulation. So far I've found these:
$173.51
$145.00
$129
$89.95 (this one seems perfect but is apparently discontinued. )
$89.00 (this one also seems perfect but the big "Pending Delivery" makes me think it would be a while...)
Any advice?
P.S. I'd like to have it before the May 9 transit, if it's possible.
I've now bought a sheet of solar film, and am waiting for it to arrive in the mail.
The film arrived this morning, and I've assembled a cover with it.
The filter I made with the film works well for viewing sunspots, and cost me less than $50! Yay cardboard!