[chunky (Clinton Wood)]

Hi Doug,

My take on it is that you are using 2 notch filters together. One is a narrow single notch - the other is multi-notch, so all you would be doing would be adding another optic with potential reflection issues and attenuating the Ha signal down another 15% or whatever the IDAS filter is for transmitting Ha. I think the Ha line averages 75% transmission on IDAS filters.

So you would just lose another 1/4 of your Ha light.

Regards
Clinton