Re: [APML] New image of Jupiter & M44

["Jim Ives" <flyboy9990@earthlink.net>]

Stephen you have some really nice Rho shots on your site!
Jim Ives
----- Original Message -----
From: "Stephen Pitt" <lthuedk@pe.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Tuesday, May 13, 2003 11:44 AM
Subject: Re: [APML] New image of Jupiter & M44


> Hi Chris.  I have an instance where the dark ray appears on one
> (Alnitak) of three stars of nearly the same magnitude, and where there
> are no spacers as you describe in the lens.
>
> http://www.light-to-dark.com/orion_blt_swd.html
>
> I've seen irregularities in Alnitak's rays before with other instruments.
>
> On your lens: How is your new 102/f.f. combo performing?  Are you
> getting full field correction and illumination with the 51mm f.f.?
>
> Best regards,
>
> Stephen Pitt
>
> Chris Cook wrote:
> > The Tak has numerous light baffles in the tube.  After thinking about it
> > some more, I think I might know what it is.... if you look at the
objective
> > from the front, there are three very small sliver rectangles evenly
spaced
> > around the very edge of the objective cell..... I'm guessing these are
some
> > sort of spacers?  Anyone here know if that's what they are?  This is
just a
> > wild guess.....
> >
> > The other idea is that its the f/6 reducer.
> >
> > Chris
> >
> > ----------------------------------
> > Chris Cook
> > Astronomical & Nightscape Photography
> > www.abmedia.com/astro
> >
> > -----Original Message-----
> > From: Chris Schur <cschur@cybertrails.com>
> > To: Discussion of Film Astrophotography <astro-photo@seds.org>
> > Date: Tuesday, May 13, 2003 8:13 AM
> > Subject: Re: [APML] New image of Jupiter & M44
> >
> >
> >
> >>Either the hexagonal (or whatever it is) shaped iris, or some internal
> >
> > light
> >
> >>baffle.  Ive seen the effect as well on very low quality highly
astigmatic
> >>lenses, but I think in this case, that is not it.  Just some ideas.
> >>
> >>Chris
> >>Astrophotograpy site: http://www.PSIAZ.com/schur/astro/index.html
> >>
> >>----- Original Message -----
> >>From: Chris Cook <ccjd@ix.netcom.com>
> >>To: Discussion of Film Astrophotography <astro-photo@seds.org>
> >>Sent: Monday, May 12, 2003 8:51 PM
> >>Subject: Re: [APML] New image of Jupiter & M44
> >>
> >>
> >>
> >>>Hi Chris -
> >>>
> >>>What do you mean by internal stop?
> >>>
> >>>Chris
> >>>
> >>>----------------------------------
> >>>Chris Cook
> >>>Astronomical & Nightscape Photography
> >>>www.abmedia.com/astro
> >>>
> >>>-----Original Message-----
> >>>From: Chris Schur <cschur@cybertrails.com>
> >>>To: Discussion of Film Astrophotography <astro-photo@seds.org>
> >>>Date: Monday, May 12, 2003 10:35 PM
> >>>Subject: Re: [APML] New image of Jupiter & M44
> >>>
> >>>
> >>>
> >>>>Chris, I suspect it is due to the shape of the internal stop on the
> >>>
> > lens.
> >
> >>>>Chris
> >>>>Astrophotograpy site: http://www.PSIAZ.com/schur/astro/index.html
> >>>>
> >>>>----- Original Message -----
> >>>>From: Chris Cook <ccjd@ix.netcom.com>
> >>>>To: <astro-photo@seds.org>
> >>>>Sent: Monday, May 12, 2003 6:50 PM
> >>>>Subject: [APML] New image of Jupiter & M44
> >>>>
> >>>>
> >>>>
> >>>>>Hi all -
> >>>>>Here's a quick shot of Jupiter/M44 I snagged a few weeks ago.
> >>>>>
> >>>>>http://www.abmedia.com/astro/current/m44-jupiter.html
> >>>>>
> >>>>>Does anyone know what causes those wide dark lines that radiate from
> >>>>>Jupiter?  I've seen them in other images done with other scopes where
> >>>>
> > a
> >
> >>>>very
> >>>>
> >>>>>bright star is within the FOV.  They don't bother me, I'm just
> >>>>
> > curious.
> >
> >>>>>Actually, I think it adds to the image.
> >>>>>Comments welcome.
> >>>>>Enjoy.
> >>>>>
> >>>>>Chris
> >>>>>
> >>>>>----------------------------------
> >>>>>Chris Cook
> >>>>>Astronomical & Nightscape Photography
> >>>>>www.abmedia.com/astro
> >>>>>
> >>>>>
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> >>
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