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Risk Management!
janoskiss,
The ERF filter is not an Ha filter. It's purpose in life is to reduce the amount of energy which gets through to the PST etalon ( which IS a commercial Ha filter), the light in turn goes through the Ha blocking filter.
I can assure you 100% that after 40 years of building telescopes and optical systems, I would be the last person to advocate un-safe solar filters. You don't get a second chance. Hence the extensive testing of the ERF combo.
It's interesting though that Baader don't even present a transmission graph for their C-ERF,so you have to take their word for the performance.
What I'm advocating is an opportunity to get a large aperture, safe, Ha system at reasonable prices.
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