Re: [APML] M42 is back!

[Grant <GB1029@inter-linc.net>]

Roland,
Thanks for the advice.  Would you say this applies
to tp work with the traveler as well?  No need for an Mv?

This is an unfortunate consequence because I routinely
use an lps under my mag 5.5 skies.  Although the improvement
is modest, I do get a touch deeper. I guess I could always buy a 105mm
lps...

Grant

At 07:50 PM 11/15/02 -0500, you wrote:
> Take the filter out.
> They will produce those nice halos around bright stars because the
> plane-parallel surfaces reflect light back and forth and produce an
> out-of focus ghost image. Most filters are not properly multi-coated and
> will reflect quite a bit of light. The added optical path of one
> reflection between front and back surface will give you the faint
> out-of-focus image.
>
> Roland Christen