Seymour filters doesn't seem to be a popular as those using Baader film or glass like Thousand Oaks. They will have to be safe or would have been banned long before now.
I have a Celestron filter using Baader film for my C8 and Thousand Oaks for my 127ED and ST80. They give completely different views. The Baader image is off white. The TO one is red/orange, and I think I prefer it.
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