Re: [ATM] What we see and what we want to see

[Mark Cowan <toolontop@yahoo.com>]

Nils Olof,

Well, there's the spoiler!  I can't go back and repeat
the experiment ;) but I do recall vividly what I saw.
It was all the more remarkable for not expecting
anything like that.  It may have been a threshold
effect, the brain "coloring in" what the scotopic
vision was delivering.  

Best,
Mark


--- Nils Olof Carlin <nilsolof.carlin@telia.com>
wrote:

> Folks,
> 
> one question that sort of suggests itself here (OK,
> it is not very 
> directly related to telescope making) is: has anyone
> really *seen* any 
> nebula in h-alpha - filtering out lower wavelength
> light? (there are, I 
> think, filters with several nm bandpass, and a deep
> red photo filter 
> would do)
> 
>  After all, the visual sensitivity for such
> long-wavelength red is 
> pretty low.
> 
>  The parts of the Orion nebula I've "seen" as
> reddish are the least 
> red parts in photos. 
> 
> Nils Olof
> 
> -------------------
> That was a nice post!  I only point out one thing,
> FWIW, and it is that at decent altitude and dark
> skies
> (OSP), when I first gathered up the Orion Nebulae in
> my carefully made and optimized 8" at 4:30 in the
> morning, besides the audible sound of my jaw
> dropping,
> there was color.  Green, yes, and red as well.  I
> didn't know you weren't /supposed/ to be able to see
> it at that aperture, with only the eye and a fine
> mirror to feed it.
> 
> Best,
> Mark
> 
> 
> --- Russell Jocoy <russjocoy@hotmail.com> wrote:
> 
> > To all on the list,
> >     Opinion's, Advise, and direction are very
> active
> > on this list... <snip> I
> > myself have asked the 
> > owner of a 48inch DOB if he could see color in the
> > Orion Nebula.....the 
> > answer was ..just a little green....<snip>
> 
> 
> 



       
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