|
Nothing special about focusing with a Ha filter fitted. The same as using standard RGB only a little more dificult because you cannot see quite as much with the filter. I still use at Bahntinof mask and bahntinof grabber to achieve the best focus possible on one of the very bright stars then move to my target then shoot off a 2 minute test image to check focus.
Depending on how narrow the bandwidth of the filter the harder it gets and the less stars you can see to achieve focus.
Good luck Brendan.
|