Re: [APML] My recent M45, and new email & web page

[Dick Locke <rlocke1@houston.rr.com>]

There is some red color around the bright stars on the positive and on the scan.  I think it
likely the processing ended up enhancing the red/magenta.  It's also interesting the the red
color isn't symetrical, so it's probably related to lack of perfect guiding, as well.

Visually I get a faint blue scatter on very bright objects (mag 0 stars & planets), but no
off-color fringing on the limb of the moon or anything.

Anyone else have thoughts?

-Dick


Michael Gartland wrote:

> I had read this article in the past, had not thought about it recently, but am still not
> fully convinced it explains what is showing up. IC434 is a red enriched region. M45 is
> not. I am not saying that there isn't some layer halation going on, it just seem real
> pronouced. I tend not to just explain something on my positives with something I find
> others writing about. Jerry is a good reference source, but you need to make sure
> yourself. Check the negs and the scans carefully. Here is an early shot in my travels on
> PJM of the same region. No halation at all, only slight optics fringing, and actual star
> color differences. (Please excuse the guiding, this was before I fully appreciated drift
> aligning and before I had an autoguider).
>
> http://members.iconn.net/~mgartlan/M45new1.htm
>
> How is your visual color correction on very bright objects with respect to fringing with
> the Tak? At 102mm it should be easily well corrected. It is likely film, but I would look
> thru your processig chain to make sure.
>
> Just some thoughts.
> m.
>
> Dick Locke wrote:
>
> > Have you seen Jerry L's article?
> > http://www.astropix.com/HTML/I_ASTROP/REDHALOS.HTM
> >
> > -Dick
> >
> > Michael Gartland wrote:
> >
> > > Maybe others can comment here, but I see severe magenta fringing around all the
> > > brighter stars, I am really curious since he is using a Tak, if that is the Tak, the
> > > film or the processing? (or my failing eyes)
> > >
> > > m.
> > >
> > > Dick Locke wrote:
> > >
> > > > Fellow APML members,
> > > >
> > > > This is my most recent, and first "decent", effort at M45.  I had a longer
> > > > exposure from the same night, that better picked up nebulosity, but guiding wasn't
> > > > acceptable on it.  (It's always something!)
> > > > http://home.houston.rr.com/dtlocke/astrophoto/m45.htm
> > > > I guess E200 isn't the best film for blue nebula.  Constructive comments would be
> > > > appreciated.
> > > >
> > > > I have completed my move to a new ISP (RoadRunner, very fast).  My email address
> > > > has changed as have my web pages.  Key links:
> > > > http://home.houston.rr.com/dtlocke/astrophoto/astro-index.htm (Astro Photo page)
> > > > http://home.houston.rr.com/dtlocke/astrophoto/leonid.htm (Leonid shot)
> > > > http://home.houston.rr.com/dtlocke/astrophoto/stn-17mm-trails.htm (Nice star
> > > > trails)
> > > >
> > > > Thanks,
> > > >
> > > > Dick
> > > > rlocke1@houston.rr.com
> > > >
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> > > --
> > > Have a Nice Day!
> > > m
> > >
> > > Email:   mgartlan@iconn.net
> > >
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> --
> Have a Nice Day!
> m
>
> Email:   mgartlan@iconn.net
>
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