Quote:
Originally Posted by Merlin66
I keep seeing this comment:
13 nm is a good choice particularly with a DSLR. It does allow the light frrom a lot more stars through than the 7nm
and for the life of me can't understand why this would ever be the case with Ha light????
The emission from Ha is a discrete line at 6563A.
Other than possibly some SII close by it doesn't matter one iota whether you view this single emission line with a 13nm or a 7nm filter. Other than the transmission efficiency of each filter, they will still pass Ha light??????
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Perhaps you keep seeing comments like this because they are FACT, put down the theory and take a look, you might be surprised.