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Hi Mike, no problem, LOL! OK filters - I used a clear filter with anti-reflection coating with highest transmission so not to lose photons. But - now - the camera does have 2 narrowband filters that are customized. [SIII] 9532A emission line and HeII at 10124 A. That is novel. I did a lot of research to find these. SIII works well and HeII goes deep into nebula so you can see stars! But it takes long exposures to get a good S/N ratio
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