Hutech makes a 8nm halpha filter that "drops into" the canon DSLR. I'm thinking of trying it out. I'm presuming this is an IDAS/Kenko Halpha (seems to have the...
Hi Jeff, have a look at the Astronomik filters. We do have a 13nm FWHM H-Alpha filter and we will ship our new 6nm FWHM H-Alpha in the mid of june. As far as I...
Dear Jeff, I own IDAS LPS and Kenko 64 but do not have a modified EOS DSLR to try out the Ha imaging. According to my rough calculation using their ...
Yes, this combination does work well. E.g.... http://pk.darkhorizons.org/haidas.htm Fwiw, I have the hutech 8nm "front filter" in the camera now. (And I'm...
Jeff, just caught your note. The 1.25" Astrodon as of late gives you 90-92% at 6 nm FWHM and is off-centered so you don't lose much with faster optics. We...
Does anyone know of a supplier in the US that sells empty 1.25" filter sets. By this I mean the 1.25" filter cell and the small ring that is used to screw into...
Hi Roger,, we do sell our ASTRONOMIK cell also just as empty cells. You should contact AVA, they should have them in stock. If you want, I can also send them...
Thanks Gerd, I sent an email to Adirondack Video Astronomy and asked them for a price for ten. I would buy them from you but I don't know how expensive the...
Hi Roger, ... Oh that´s no problem. DHL works worldwide, and as the cells are quite thin I could ship them as a letter. I think it costs about EUR 8,- ... ...
Hi. I've been doing some basic RGB imaging for a while using simple dyed glass filters and now want to move up to a set of dichroic filters. To help me choose...
I'd recommend AR coating if you can get it. it will help on star reflections in many cases. I have no information on the best filters for your application...
Adrian, I make the Astrodon imaging filters. Building upon what Richard said, you should choose A/R coating to minimize reflections within your optical system...
Hi Adrian, ... We do have a lot of customers who use our ASTRONOMIK filters with great sucsess with their webcams. ... If you go ahead for interfernce filters...
... a. ... you ... I was hoping Don would comment on this. One thing I should add about the parfocality of the filters: if the scope is a mirror based scope ...
... you ... very thin ... made. ... requested ... the glass ... hi Gerd, I have some custom scientific narrowband (3nm FWHM) emission line filters ([SII], Ha,...
Hi Gerd; thank you for the information about Astronomik filters. (BTW I already have an Astronomik H-alpha filter and like it very much!) I'm very interested...
Richard & Don, I thought some more about what Gerd said ..... and I begin to see his point. Tell me if you think this logic is wrong: Interference filters...
there's a quite good write up about all of this in Born and Wolf's "Principles of Optics". ... coating' ... reflecting ... in ... by ... we ... <rdcrisp@e...> ...
Well, Adrian, you have 2 filter manufacturers on this list. To answer an earlier question. Unlike Astronomik and Astrodon narrowband filters, Custom...
Hi all, nearly everything of waht is said here is correct. If you make the filter out of two pieces of glass and turn the filters layers to the inside, you ...
... Being a user of a Schuler Ha (9nm marked), Astrodon, and Cust Sci (3nm and 4.5nm) I can say that the ADs have the least halo problems of the lot. I like...
Thanks for the very interesting discussion. I think Richard is right. Everyone should own one of each brand <g>. Eliminating the internal reflections that...
This was a very good discussion, and I think everyone should own one of each brand, like Richard! <g>. Please realize that there are two types of multi-layer...
... one ... I recommend it. if for no other reason than to debunk rumors. But I have found that just like scopes it seems that some are better for some things...
I put together a gallery of some of my favorite tricolor emission line images over this past weekend to make them a bit easier to find on my website. I've...
Last night I had good conditions in my backyard in Castro Valley. So while others spend a perfectly good evening getting a crummy, but scientifically...
Really nice shot Richard! Very Hubble like. I didn't know you had started shooting with an AP180. Quite a variety of scopes you have been through. Kevin ......
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