Re: [APML] New Schmidt Camera image: Machholz on Saturday

["Chris Cook" <ccook@cape.com>]

or.... lenses like the Canon EF 200mm f/2.8L coupled to a STL-11000 etc....
There's no need to stop down this lens so you can take advantage of the fast
f/2.8 speed.

See:  http://panther-observatory.com/


Chris

-----------------------------
Chris Cook Photography
www.cookphoto.com


----- Original Message ----- 
From: "Jim Janusz" <jjanusz@dc.rr.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Tuesday, March 15, 2005 3:02 PM
Subject: Re: [APML] New Schmidt Camera image:  Machholz on Saturday


Hi Kent,

I think an answer to this problem is already available.  The Tak Epsilons
make great astrographs and at F 3.3 are approaching the Schmidt Cameras.
Check out Dean Jacobsen's images like this one.

http://www.astrophoto.net/ngc1977.html

F 3.3 to CCD is like F 1.5 to film when you compare the response curves and
QE.  Short of making our own TP, oh forget it. :^(

Jim
  ----- Original Message ----- 
  From: KGKIRKLEY@aol.com
  To: astro-photo@seds.org
  Sent: Tuesday, March 15, 2005 8:00 AM
  Subject: Re: [APML] New Schmidt Camera image:  Machholz on Saturday



  In a message dated 3/15/05 9:29:50 AM, comets133@yahoo.com writes:



    Bradley, intersting point, I think film will be around
    for another 20 years or so, but it will be like Kodak
    Max film, useless for skyshooting but as general in
    nature as possible for taking shots with those
    cardboard film cameras.  Soon it will be time to put
    the schmidts on the museum shelf!

    Chris



  Chris, et al:
  I hope not.
  As they say, when there's a will, there's a way!!
  I think someone will figure out how to replace the Schmidt's film holder
with a CCD unit which will incorporate a built in field flattener. Yes, it
will probably mean reworking the invar rods and spider and may be
costly........but just think of it.....a 300mm f1.5 Schmidt with 35mm sized
(or larger) chip. While typical Schmidt film exposure times are in the 5-10
minute range, with a CCD it might be in the "a couple of minute" area.

  Kent Kirkley
  8 inch f1.5 Celestron-Epoch Schmidt
  (that refuses to become an umbrella stand)


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