With the Great American Eclipse on Aug 21 only a few weeks away, I decided to put together some solar filters. With the high travel costs to get to the eclipse from Southern California, I saved some money through purchasing the solar filter sheets instead of the pre-made filters. To facilitate a fast detachment during totality, compared to a screw on filter, I made some cardboard holders that fit into my Lee filter holder.
Solar Filter Sheet from Thousand Oaks Optical: $15 vs the $150 Lee solar filter.
Remember, never look at the sun without a filter (except during totality).
Some other great resources for the upcoming eclipse