Re: Filters

Hi Gary,
Try them at night - the OIII filter will make bright stars appear
bluish/greenish/gray, i.e. not much color and pretty dim; the HII will make all but the brighter stars disappear and the ones you can still see will be reddish. The last time I tried an HII all the stars I could still see were red. It was a Lumicon.

Hmmm, that's a puzzlement. The colors in an 0III filter are going to be pretty subtle. Ok, mostly gray 8) When you're dark adapted the eye doesn't have the best color perception. I am surprised that you can see some reds, though. Maybe it's some kind of narrow band filter for imaging like Ha though I don't know if you can see anything through one of those.