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[QUOTE=loc46south;1217399]Greg - Peter is correct - I suspect that the Remote Guide Head has a NIR coated chamber window, not that it matters now - I have sourced a ST7XME and that has a QE of around 50% at 850nm, so guidestars will not be a problem.
That's interesting, so the STi has a NIR coating. That may well be true. It would explain why I didn't see much of a gain using an IR filter on a MMOAG with it.
Greg.
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