troypiggo
17-04-2012, 01:21 PM
I've recently been exchanging some emails with Astronomik regarding their narrowband filters as part of my halo problem (http://www.iceinspace.com.au/forum/showthread.php?t=86869). They've sent me out replacements now, so pending some testing, all good and happy there.
But in the email exchanges, they talked about the filters not being ideal for my setup, and when they sent me the replacements, they said the filters they have sent were selected for my telescope. Quoted below is the email exchange. They haven't yet responded to my last query for clarification.
What I don't understand is that they only have 12nm Ha, OIII, SII, Hb filters, and also a 6nm for Ha. They've sent me the exact same filter bandwidths that I had before. What is this selection for my telescope they're talking about? Is it a bit of BS/marketing dribble?
An additional concern of mine is that, like many of us, I use more than one telescope to image with. So if they've sent filters just for the scope with which I took the sample images I had to provide them with to assess the halos, what about my other scopes?
Is there some special formula for working out the best filters for each scope? I know there's good, bad, and ugly filter quality. But that's between brands, not within the actual product line of an individual manufacturer. I mean, I'm looking at Astrodons. I know they have 3nm and 5nm bandwidths. Is the selection of the bandwidth dependent on the optics? ie would one be better than other for 10" reflector vs 92mm refractor?
4/4/12:
But in the email exchanges, they talked about the filters not being ideal for my setup, and when they sent me the replacements, they said the filters they have sent were selected for my telescope. Quoted below is the email exchange. They haven't yet responded to my last query for clarification.
What I don't understand is that they only have 12nm Ha, OIII, SII, Hb filters, and also a 6nm for Ha. They've sent me the exact same filter bandwidths that I had before. What is this selection for my telescope they're talking about? Is it a bit of BS/marketing dribble?
An additional concern of mine is that, like many of us, I use more than one telescope to image with. So if they've sent filters just for the scope with which I took the sample images I had to provide them with to assess the halos, what about my other scopes?
Is there some special formula for working out the best filters for each scope? I know there's good, bad, and ugly filter quality. But that's between brands, not within the actual product line of an individual manufacturer. I mean, I'm looking at Astrodons. I know they have 3nm and 5nm bandwidths. Is the selection of the bandwidth dependent on the optics? ie would one be better than other for 10" reflector vs 92mm refractor?
4/4/12: