[Drac0 (Mark)]

Well I got myself a 7nm Ha filter & with MAYBE the chance of a few hours of clear sky & the full moon over the weekend I was thinking of giving it a go. But never tried it before so any tips & suggestions would be welcome.


My intended target is M20 - the Trifid Nebula. I do have a few of questions to get started.



1. Where to position the filter, close to the sensor (I have a ZWO adapter to put it right up close) or further out on the scope side of the flattener/reducer?
2. Going to also be capturing it with an OSC and combining them in post. What sort of integration time ratio should I be looking for? Say I do 4 hours OSC, how much time would be suitable for just Ha?
3. In regards to exposure time, do I keep them the same for both OSC & Ha, or should I do longer/shorter Ha subs.


That will do foe a start.


TIA!
Mark