Re: [APML]M51 (was [APML] M101)

[Michael Cole <mrcole@earthlink.net>]

Larry,
You could open a full can of worms with questions like that <g>.  Everyone has
there opinion as to what is best.
I know that I went from SCT to refractors years back for film use.  I previously
had a 10" SCT and it worked very good for CCD.  There is always the question of
how much the central obstruction takes away from the image, but the work of Tony
and Rob, Phillip, Adam Block and numerous others show that the extra focal length
of reflectors can markedly increase the resolution for both film and CCD.  I
would have a tendency to compare like focal length instruments as opposed to
refractors with reflectors.  I think that a common mistake of anyone starting out
is to accept short exposures of either film or CCD as adequate.  The longer the
exposure (be it all adding them together) the better the final image.
Good Luck,
Mike

Larry McManus wrote:

> Mike
> I'm new to this. I look at all the good images coming out of this group and
> see a lot being taken with refractors. I have an 8" sct and am trying to
> determin what to expect from images I will take by comparing pictures taken
> by like equipment. What criteria do I use whn comparing images taken by
> reflectors or by refractors? For instance is an 8" reflector comparable with
> a 5" or 4" refractor?
> Thanks...Larry
> ----------
> >From: Michael Cole <mrcole@earthlink.net>
> >To: astro-photo@seds.org
> >Subject: Re:[APML]M51 (was [APML] M101)
> >Date: Wed, May 15, 2002, 3:31 PM
> >
>
> >Larry,
> >I use a six inch refractor.
> >Mike
> >
> >Larry McManus wrote:
> >
> >> Very Nice...What size scope?...Larry
> >>
> >> on 5/15/02 11:24 AM, Michael Cole at mrcole@earthlink.net wrote:
> >>
> >> > Tony,
> >> > You big scope guys and mosaics are taking away all the advantages of our
> >> > little refractors.  You and Rob inspired me to try M51 with CCD (my
> >> > third CCD picture).   Here is my attempt.  Total of over six hours
> >> > imaging time.
> >> > http://home.earthlink.net/~fct150/m51.htm
> >> >
> >> > Tony Hallas wrote:
> >> >
> >> >> Part 1.1    Type: Plain Text (text/plain)
> >> >> Encoding: quoted-printable
> >> >
> >> > --
> >> > Michael Cole
> >> > Urban Imager Website:
> >> > http://home.earthlink.net/~urbanimager
> >> >
> >> >
> >> >
> >> >
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> >--
> >Michael Cole
> >Urban Imager Website:
> >http://home.earthlink.net/~urbanimager
> >
> >
> >
> >
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--
Michael Cole
Urban Imager Website:
http://home.earthlink.net/~urbanimager




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