From: Pertti (pertti_at_antispamdomain.not)
Date: Wed Nov 26 2003 - 08:55:34 EST
--- In digital_astro_.at._yahoogroups.com, Philippe HAAKE <beruberu_.at._f...> wrote:
> On Wed, 26 Nov 2003 11:11:18 -0000, you wrote:
>
> >Hi group, anyone know a supplier that can provide a HA filter for my
> >new Canon 300D? it's 58mm by .75 thread pitch. I would like to try
> >this before investing in one for my LX200 10".
> >Clear skies.
> >
> >Dave
> >
> Do you mean H Alpha filter????
> I f yes they cost many 1000$, and you will not find any for your
> canon, it is not possible.... they have to be installed on a
> telescope...
Note that there are two different kinds of H alpha filters:
1) A very narrow band for solar imaging. These are very
costly (several 1000's of $/€) and are available only for
certain telescopes.
2) A wider band filter for emission nebula imaging. These are
less costly (but not inexpensive at 100-300 $/€) and might be
available in camera filter sizes. However, they are a more
expensive for cameras than for eyepieces as they are larger.
Pertti
------------------------ Yahoo! Groups Sponsor ---------------------~-->
Buy Ink Cartridges or Refill Kits for your HP, Epson, Canon or Lexmark
Printer at MyInks.com. Free s/h on orders $50 or more to the US & Canada.
http://www.c1tracking.com/l.asp?cid=5511
http://us.click.yahoo.com/mOAaAA/3exGAA/qnsNAA/N_XolB/TM
---------------------------------------------------------------------~->
Before posting an image to our group please read the space mangement guidelines:
http://groups.yahoo.com/group/digital_astro/files/Photos%20Section%20Space%20Management%20Guidelines
Please check the digital_astro FAQ at:
http://www.szykman.com/Astro/AstroDigiCamFAQ.html
Be sure to visit the digital_astro Gallery and Archive at:
http://velatron.com/dca/gallery
http://velatron.com/dca/archive
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
This archive was generated by hypermail 2.1.7 : Wed Nov 26 2003 - 08:57:27 EST