Hi all, I am nearly in a position to purchase a Ha filter for my DSI II Pro, I am very impressed with the level of detail they show up as well as their ability to cut out moon glow and light pollution.
I have found two at the moment for sale, one is a 13nm Astronomik and the other is a 7nm Baader.
I am wondering which of the two would be the better to purchase, there's only a $10 price difference between the two. Is it correct to assume that the 7nm would be suited more for the suburbs but as I will be moving to a dark sky site to live within twelve months perhaps the 13nm would be a better choice.
Also with a Ha filter is the IR/UV blocking filter still used or does it need to be removed.
Cheers all
