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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 -----
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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