Thanks for the offer, Erik, but I don't need to borrow it. Ive used the Lumicon filter before. There are only a handful of nebulae that respond to the filter- but they are both huge and very small. I have several smallish telescopes with 1.25" focusers, so 2" filters won't work with those, on the other hand, H-b nebulae require a fair amount of aperture anyway. So I'm leaning toward the 2" format, and if I ever have occassion to need it with the smaller scope, will just hand-hold it over the eyepiece. On Fri, Apr 10, 2009 at 9:04 AM, <erikhansen@thebluezone.net> wrote:
Hi Chuck,
I have a 2" H-beta (Lumicon) seems most nebulae it is good have large apparent field. The only time I have bought a 1 1/4 is when the threads on the 2 inch filters don't thread into my 1 1/4-2 inch adapter (Orion filters).
You can borrow mine for a few weeks if you would like to.
Erik
I'm going to add a Hydrogen-beta filter to my equipment this season,
and am asking for experiences with various brands/sizes. I realize that the list of objects it is useful on is very small; I have used borrowed H-b filters in the past. I only want to purchase one size. 1.25" or 2"? I have my own opinion but would like to read others before I spend my money.
TIA!
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com