hello everyone,

do any of you know if there is such a thing as an Halpha filter for just a pentax 50mm lens?  do they only make them for telescopes?  or the alternative i guess would be any good filters out there for light pollution that can be used on this lens size?

thank you for any ideas.

H-alpha photographic filters are available in a variety of sizes and some will fit standard camera lenses. You may need a photographic filter step-up adapter ring to make the filter fit lenses of sizes not listed by the filter maker.

Here is a link to a page at Lumicon's Web site, for example.

These filters are not for solar use ... that is, they will work for photographing the h-alpha emissions from nebulae but do not block enough light for use when photographing the Sun.

hey alright!

thanks alot, i think the two inch filter will fit perfectly.  thanks this should help out pretty good.  we dont have a lot of light pollution in the area unless the humidity gets up there.

thanks again.