Image of the day

Captured by
Alexander DiNota

M33 Triangulum Galaxy

My Account

New to Astromart?

Register an account...

Need Help?

Broadband vs. narrowband

Started by BennettB64, 02/15/2006 07:30PM
Posted 02/15/2006 07:30PM Opening Post
I live in a highly light-polluted area of South Florida and would like to know which is better for lunar/planetary and some limited deep-sky observing - narrowband or broadband filters. I use a C-11 XLT.
Posted 02/15/2006 07:44PM #1
Get the Narrow Band and it will do the best for more objects. Niether is really for planetary or Lunar veiwing though. For Lunar a polarizing filter works well and for planetary a Baadar Contrast Booster or a color filter is the better choice. There are specialty filters for Mars, by Televue and other types that might be OK.

[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue grin
Amateur Imager
Posted 02/16/2006 09:44AM #2
Hello:
Please note that no filter will help cut through the light pollution when observing star clusters, galaxies, or reflection nebulae. They only work on emission nebulae since. These filters work by allowing the narrow line emission of the emission nebulae to pass through while rejecting everything else. Since stars and galaxies are broadband sources, the filters don't help them.
I personally use a narrowband filter, which helps nebulae a lot even from very dark sites.

Cheers
Mike Connelley
Posted 02/16/2006 09:54AM #3
You may find these articles of interest:

http://www.cloudynights.com/item.php?item_id=63

http://pages.sbcglobal.net/raycash/filters.htm

http://sciastro.net/portia/advice/filters.htm

Dave Mitsky

Chance favors the prepared mind.

De gustibus non est disputandum.