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Re: [APML] A Fresh Lens Recommendation Thread
O wow mike...
I remember looking for this page a few times but I had lost it....Those wide
field H-a images by Steve are awesome...its the whole H-a thing that gets
me!
http://www.galaxyimages.com/gallery.html
This might be my only alternate due to me moving to a light polluted area in
a few months
I know its ccd but hey.
Brian
Freeze this moment
A little bit longer
Make each sensation
A little bit stronger
Make each impression
A little bit stronger
Freeze this moment
A little bit longer
My photography:
http://www.astrobri.com
----- Original Message -----
From: "Mike Cook, AF9Y" <mwcook@concentric.net>
To: <astro-photo@seds.org>
Sent: Tuesday, December 17, 2002 9:03 PM
Subject: Re: [APML] A Fresh Lens Recommendation Thread
> You might be interested in this approach if you haven't already seen it:
>
> http://www.galaxyimages.com/focus.html
>
> Of course with a CCD, only the center FOV of the lens would be used so
> the performance would be even more impressive.
>
>
> Mike
>
>
> >From: stephen pitt <lthuedk@pe.net>
> >
> > > This might be an ideal lens for use with an ABG CCD like the ST-2000.
I wonder
> > > if RoboFocus could be adapted to drive it.
> >
> > I don't know. The focus ring is ~2.5" in dia, located in the center of
> > the lens, which is 9.5" long. I too would like very much to attach a
> > CCD camera to this optic. You probably noticed slightly elongated stars
> > at the top of the corner shots, but the degree is rediculously small.
> >
> > While no correction in a camera lens can be perfect, this SD has very
> > low chromatic aberration-about what one would expect in a very good ED.
> >
> > I shoot at Joshua Tree, where the skies are fairly dark. As I said
> > elsewhere, the lens will vignette with other films of less contrast and
> > broader value range, especially when clarity is down. But its never
> > objectionably bad. On a bad night, I'm sure there would be some
> > vignetting with the EII at f2.8. Unfortunately, I made no notation to
> > that effect on the sample night. Clearly, it was a good night.
> >
> > Stephen
> >
> >
> > >
> > > Mike Cook
> > > AF9Y
> > >
> > > Date sent: Tue, 17 Dec 2002 14:42:17 -0800
> > > From: stephen pitt <lthuedk@pe.net>
> > > To: astro-photo@seds.org
> > > Subject: Re: [APML] A Fresh Lens Recommendation Thread
> > > Send reply to: astro-photo@seds.org
> > >
> > > > Hi Mike, sure:
> > > >
> > > > http://www.light-to-dark.com/corners
> > > >
> > > > >From the 2700 dpi image. Stephen
> > > >
> > > > "Mike Cook, AF9Y" wrote:
> > > > >
> > > > > Stephen,
> > > > >
> > > > > That looks quite impressive, especially if it was taken at
F/2.8.
> > > > > Could you show a 1:1 crop of the corners to give us an idea of
> > > > > how good it really is?
> > > > >
> > > > > Mike Cook
> > > > > AF9Y
> > > > >
> > > > > Date sent: Tue, 17 Dec 2002 10:26:13 -0800
> > > > > From: Stephen Pitt <lthuedk@pe.net>
> > > > > To: apml <astro-photo@seds.org>
> > > > > Subject: [APML] A Fresh Lens Recommendation Thread
> > > > > Send reply to: astro-photo@seds.org
> > > > >
> > > > > > In my previous post, I recommended the Tokina 2.8 SD. Here is a
> > > > > > positive taken with it:
> > > > > >
> > > > > > http://www.light-to-dark.com/EII
> > > > > >
> > > > > > When viewed over a lightbox, the stars are perfectly pin
pointed.
> > > > > >
> > > > > > Stephen
> > > > > >
> > > > > >
> > > > > > -- APML Archives at <http://astro.umsystem.edu/apml/> ---
> > > > > > Unsubscribe at <majordomo@seds.org>
> > > > > >
> > > > >
> > > > > Mike Cook, AF9Y
> > > > > http://www.af9y.com
> > > > > mwcook@cris.com
> > > > >
> > > > > -- APML Archives at <http://astro.umsystem.edu/apml/> ---
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> > > >
> > >
> > > Mike Cook, AF9Y
> > > http://www.af9y.com
> > > mwcook@cris.com
> > >
> > > -- APML Archives at <http://astro.umsystem.edu/apml/> ---
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>
>
> Mike Cook, AF9Y
> http://www.af9y.com
> mwcook@cris.com
>
>
>
>
>
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