Re: [APML] 7 new shots and layout change

["Robert Gendler" <robgendler@worldnet.att.net>]

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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> >
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>
>
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