I'm new to the group and am wondering if anyone out there has a V- filter that can be screwed to 2" nose of my SBIG , available for sale. Or if anyone knows of a source for an V-filter
I bought my V filter from Chroma Technology (www.chroma.com). It was 1.25", but they have 2" as well, reasonably priced. Bandpass graph attached
A popular source of Photometry Filters, in both 1.25" & 2", is Astrodon:
http://www.astrodon.com/products/filters/astrodon_photometrics_-_uvbric/or simply www.astrodon.com and let your fingers do the walking
Also, do not overlook Custom Scientific:
Ad Astra & Good Observing, while I am at, I am on the mentoring team, so if you any questions along the way (and there is no such thing as a dumb question) feel free to email me:
Ad Astra & Good Observing,
Tim Crawford, CTX
I like the Astrodon V filter, that is the one I use. Unfortunately, 2" size has been made without screw ring, and the ring from another 2 inch filter doesn't fit.
Edit: I've seen the other brands sell the two-inch filter unmounted too
What model is your camera? Even with a KAF-8300 chip you can use a 1,25" filter if you can put it close enough to the camera window, if you don't use an f ratio minor than 5.
PS. I din't know about Chroma company. It seems their photometric filters doesn't have as much as transmission as astrodon filters, but I praise them for being honest and transparent showing good and precise transmission curves (with downloadable numerical values).
The camera I have is a STF8300c - I suppose that I can go the 1.25" route if I have to. Though I did noitice that Chroma will mount the filter for at no additional charge. I might investigate that a bit more.
Thanks for all the responses.
Just for reference, Baader Planetarium supply photometric filters.
If you're going to buy a new photometric filter go to Chroma or Custom Scientific (the second made the filters for SBIG). Don't buy the Baader or you will have a few problems in Nova or Supernova photometry.
Or buy the Astrodon if they have the 2" thread (I don't remember if they have it).