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Re: [APML] OT: digital vs film - fast comets
Hi Chris:
I will be interested in Loke's answer, but my thought is that even the
smaller-than-35mm size chip in the 300D/10D digital cameras will suffer from
the field curvature of the Schmidt. In addition, I don't think any Schmidt
made allows a whole camera body to be inserted into the scope.
My 2 cents----
Bert
Bert Katzung
katzung1@comcast.net
www.astronomy-images.com
----- Original Message -----
From: "Chris Cook" <ccjd@ix.netcom.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Wednesday, December 24, 2003 8:45 AM
Subject: Re: [APML] OT: digital vs film - fast comets
Hi Loke -
How do you think the 300D would stack up against color films like 400F or
E200 when used in the Schmidt?
Chris
----------------------------------
Chris Cook
Astronomical & Nightscape Photography
www.abmedia.com/astro
-----Original Message-----
From: Loke Tan <tan@cox.net>
To: Discussion of Film Astrophotography <astro-photo@seds.org>
Date: Wednesday, December 24, 2003 10:19 AM
Subject: RE: [APML] OT: digital vs film - fast comets
Chris,
IMHO, I do not think that the Canon 300D nor the 10D single shot RGB
CCDs can equal a Schmidt with TP today. The Schmidt is very well paired with
hypered TP in either B&W or tricolor. The combination is very optimal, you
have the hypered TP film with extremely good resolution and reciprocity
characteristics, and you also have the very fast Schmidt which is extremely
well corrected optically. The issue with the Canon digital cameras is that
the lenses are not as well corrected to match the resolution of the CCD. To
make better lenses, I am afraid the costs will be much higher.
Loke
-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Chris Cook
Sent: Tuesday, December 23, 2003 11:35 AM
To: Discussion of Film Astrophotography
Subject: Re: [APML] OT: digital vs film - fast comets
Loke -
One thing I thought of concerning shooting fast bright comets(i.e.
Hyakutake etc...) is that the SBIG cameras will be unable to shoot a color
image that does not have the stars broken up into Red, Green and Blue
trails. Not that this kind of image is bad, I just personally do not like
them as well. The Canon 300D and 10D being single shot RGB chips can most
likely equal the kind of comet shots done with film. As for wide field
digital, the Canon shooters will have to find a excellent 300mm f/2.8 lens
capable of being shot wide open with no aberrations of any kind ....any
ideas? Hopefully we'll find out this coming May...
Chris
----------------------------------
Chris Cook
Astronomical & Nightscape Photography
www.abmedia.com/astro
Another interesting thing which might happen is when the next
large/bright comet comes our way. I am curious to see if the best widefield
images will be shot on CCD or on a Schmidt Camera with TP. The interesting
matter here is that a large comet changes quite rapidly and the f/1.5 speed
of the Schmidt really helps to shorten exposures for TP. Unfortunately CCDs
will not be able to be used in a Schmidt unless you can curve the chip. But
the CCD is more sensitive than hypered TP, so this will make a very
interesting comparison. Anyway, these are my current thoughts on the
subject.
Loke
-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Tony Hallas
Sent: Monday, December 22, 2003 2:15 PM
To: Discussion of Film Astrophotography
Subject: Re: [APML] OT: digital vs film
Oh boy,
Let's not start THIS again ... those of us who know better know
that the boundaries between film and digital are starting to blur more and
more with each passing day ... you may shoot film, but I bet you use some
form of digital post processing ... where do you draw the line? You can use
film to start with and use digital to process, or you can shoot digital and
use dedicated film-type processing like Photoshop as the post processing ...
the lines merge, black and white is turning gray ...
The best thing that can be said for Rob's images is that he
aspires to make them as photorealistic as possible ... that's why he should
stay on this list... I have seen CCD originated images that look more "film
like" than some convoluted attempts starting with film and trying to make
them look digital ...
Those of us who come from a solid film background and who have
been on this list for awhile have an edge on our "CCD only" compatriots ...
ultimately the techniques that come to bear in making a great photo must be
used even if the image had its beginnings as a CCD receptor ... speaking
from my own experience, about 20% of a CCD image that I make borrows from
pure CCD technology ... the rest is all film.
Tony
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