I was thinking last night that it would be good to be able to view the sun through the telescope. It’ll give me more “telescope time” while it’s staying light so far into the evening.
So, I started researching solar filters and found a major price difference:
I think the difference is in the material – the cheaper one is glass and can shatter / break when dropped. The more expensive filter is made of Baader Astro Solar™ Safety Film, which is apparently far superior to glass, Mylar or polymer materials. It gives brighter, sharper and higher contrast pictures.