Re: (IAAC) brodband filter

Erhan A. Ozturk wrote:
> Actually NGC 55 is extremely difficult from 40N lattitude. NGC 253 and much
> fainter NGC 247 are in better dec.
> I have some questions about filters. I will be glad if you answer me.
> Does a broadband filter help against tungsten and mercury lights?
> Does a broadband filter improve galaxy or star cluster views in light
> polluted (tungsten and mercury. Few sodium) skies? Does it help to find
> faint objects, say M33, under light polluted skies.
> Assume that, in a cluster, most of the stars have the same color. Does a
> color filter help to block some of the light pollution without giving much
> harm to the brightness of the cluster?
> Can I improve the contrast between a red nebula and the sky by using a red
> filter? Maybe it may work like a very broad band nebula filter.
> I know that there are many filters with narrow bandwidth but I am looking
> for a general solution (if exists). I mean I am looking for a solution that
> also improves the views of galaxies or star clusters.
> Best wishes, clear skies
> Erhan A. Ozturk
See David Knisely's article on light pollution filters at
http://www.weatherman.com/uhc.htm (.)
To UNSUBSCRIBE from the 'netastrocatalog' lists, use the Web form at: