Re: [APML] New image of Jupiter & M44

[Stephen Pitt <lthuedk@pe.net>]

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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> 
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