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13 nm is a good choice particularly with a DSLR. It does allow the light frrom a lot more stars through than the 7nm that I use.
Ha imaging is a little diferent with capture and processing but I am sure you will come to terms with it very fast. Just lots more exposure time but the end result is worth it and it also provides a sharp detail when blended with your RGB images.
Rob Gendler has some great tutorials and notes on Ha blending which are well worth a look if you intend to follow this path.
Have fun Mate.
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