All Discussions Tagged 'filter' - AstroGab2024-03-29T14:28:25Zhttp://astrogab.ning.com/forum/topic/listForTag?tag=filter&feed=yes&xn_auth=noNarrowband Filter Choicetag:astrogab.ning.com,2012-11-19:6354305:Topic:1199372012-11-19T19:20:00.222ZGreg Marshallhttp://astrogab.ning.com/profile/GregMarshall
<p>I've been dissatisfied with my Astronomik brand O-3 and S-2 filters because they are too broad (12nm) to provide adequate contrast. More specifically, if I adjust exposure and curves to match the brightness of stars relative to the 6nm H-a filter, most targets have almost no oxygen or sulfur signal. So I'm planning to replace them with narrower Astrodon filters, but can't decide between 5nm and 3nm. I'll be replacing the H-a filter as well, since I need them to be reasonably…</p>
<p>I've been dissatisfied with my Astronomik brand O-3 and S-2 filters because they are too broad (12nm) to provide adequate contrast. More specifically, if I adjust exposure and curves to match the brightness of stars relative to the 6nm H-a filter, most targets have almost no oxygen or sulfur signal. So I'm planning to replace them with narrower Astrodon filters, but can't decide between 5nm and 3nm. I'll be replacing the H-a filter as well, since I need them to be reasonably parfocal.</p>
<p>My concern is that the 3nm filters are much more expensive and might be more of a pain to use (especially in terms of longer exposures). My interest is entirely in "pretty pictures", not science research, but need to use NB at my home observatory to deal with light pollution.</p>
<p>Any and all opinions are appreciated!</p>