Re: [APML] 7 new shots and layout change

["Marco Lorenzi" <lorenzi70@tiscali.it>]

Hi Rob, I didn't get you wrong, just I didn't understand your question :-)
Here is the same shot without the diffusion filter part:
http://astrosurf.com/lorenzi/images/orionbeltlp_n.jpg.
I believe you are right, this lens is not completely apo but at least on
film almost all chromatic aberration is lost in film halation (yes, film is
much more forgiving than CCD)... Blue halo around belt's stars are due to
the tiny clouds ha passed during the exposure...
Ciao
Marco

----- Original Message -----
From: "Robert Gendler" <robgendler@worldnet.att.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Sunday, November 30, 2003 6:38 PM
Subject: Re: [APML] 7 new shots and layout change


> Hi Marco,
> Don't get me wrong....I enjoy all of your beautiful images.
> I have used both the 180 and 300 F2.8 and found
> that with CCD there is very significant chromatic aberration.
> I had to refocus for each filter and the blue channel was particularly
> difficult to achieve focus. These lenses are not apochroamtic (and
> matter of fact not even close). I realize that film is much more forgiving
> than
> CCD when it comes to optical imperfections. CCD's tend to challenge
> optical systems and expose imperfections.
> Rob Gendler
> Email: robgendler@att.net
> Web site: http://www.robgendlerastropics.com/
> ----- Original Message -----
> From: "Marco Lorenzi" <lorenzi70@tiscali.it>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Sunday, November 30, 2003 10:33 AM
> Subject: Re: [APML] 7 new shots and layout change
>
>
> > Thank you Rob! I don' understand really your question: halos was
> introduced
> > by the diffuser filter (in reality also some clouds present partially
> during
> > the long exposure did a little job). What kind of chromatic aberration
are
> > you referring to?
> > Marco
> >
> > ----- Original Message -----
> > From: "Robert Gendler" <robgendler@worldnet.att.net>
> > To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> > Sent: Saturday, November 29, 2003 9:51 PM
> > Subject: Re: [APML] 7 new shots and layout change
> >
> >
> > > Marco,
> > > Very impressive! Although I love the star colors in your Barnards ring
> > > shot I wonder how much of those halos are really chromatic aberration.
> > > Rob Gendler
> > > Email: robgendler@att.net
> > > Web site: http://www.robgendlerastropics.com/
> > > ----- Original Message -----
> > > From: "Marco Lorenzi" <lorenzi70@tiscali.it>
> > > To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> > > Sent: Saturday, November 29, 2003 12:39 PM
> > > Subject: [APML] 7 new shots and layout change
> > >
> > >
> > > > Dear friends, I have uploaded to my site 7 new shots taken form
> Namibia
> > > and
> > > > La Palma. Direct link is
> http://astrosurf.com/lorenzi/images/newshot.htm
> > > > I have also changed my gallery layout and I would be interested in
you
> > > > opinion: you can access from main page -> gallery (at bottom)
> > > > Clear skies
> > > > Marco
> > > >
> > > > Home Page http://www.astrosurf.com/lorenzi
> > > >
> > > >
> > > >
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