Celestron is offering these white light solar filters:
https://www.celestron.com/collection...-solar-filters
They claim compliance with ISO standards - which only apply to naked eye "sunglasses" type filters!
here's no mention of transmission curves or surface accuracy of these filters.
The filter material is manufactured by American Paper Optics who ONLY manufacture eclipse glasses.....and don't have any available data on their material - only that it meets ISO.
Nothing like the info available from Baader.
I'd be interested in feedback from any users of these filters.
I'm concerned that the quality will be nowhere near the minimum 1/4 wave.
Let me know.
Ken