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I found this article comparing the Baader film to the Thousand Oaks film.  It appears that the Baader is sharper, wider spectrum, and brighter.

I've used the Baader film for 20+ years since it was introduced.  In my 8" Dob, I find I need an IR blocking filter for long viewing sessions.  This shouldn't be an issue with a C90, though.

Comparison images:

Baader:

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Thousand Oaks:

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