We are excited to announce the launch of our new forums! You can access it forums.aavso.org. For questions, please see our blog post. The forums at aavso.org/forum have become read-only.
Announcement: New Applications
We are excited to announce the launch of our new applications! We're opening up early access to our new applications for searching, downloading, and submitting photometric observations. You can now access these applications through these links:
We ask for your feedback in order to help us improve these applications. Please send feedback for the applications above to feedback@aavso.org. Note: please avoid duplicating submissions across the two submit applications.
American Association of Variable Star Observers (AAVSO)
Mon, 09/30/2013 - 19:56
Hi all,
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
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:
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).
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).
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… simply www.astrodon.com and let your fingers do the walking
Also, do not overlook Custom Scientific:
http://www.customscientific.com/astronomy.html
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:
tcarchcape@yahoo.com
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).
Just for reference, Baader Planetarium supply photometric filters.
http://www.astroshop.eu/baader-planetarium-1-25-ubvri-v-photometric-filter-set/p,20212#tab_bar_0_select
Doug.
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).