Re: [APML] E200 and push [was: E100 and Velvia]

["Daniel Reyna" <dreyna14@earthlink.net>]

I have to agree with Matt.  In my opinion Pushing E200 only makes it easier
to scan.  When I shoot at f/5 I have to go about 35-40 minutes to get an
image that will scan well, getting a maximum amount of detail with no push.
I would rather shoot one long one and not have to push it than to shoot a
short one and have to push it.  You will get more image "signal" by doing
so.

Daniel

http://home.earthlink.net/~dreyna14/astro.htm

----- Original Message -----
From: "Matt BenDaniel" <matt@starmatt.com>
To: <astro-photo@seds.org>
Sent: Monday, October 21, 2002 1:50 PM
Subject: [APML] E200 and push [was: E100 and Velvia]


> Jose,
>
> Many users of E200 push it. If you push E200 one stop, its ISO rating
increases to 320 (but ISO numbers don't mean as much to astrophotographers
as they do to regular photographers). Pushing E200 tends to brighten an
under-exposed sky background to a lighter shade, yielding a better scan with
some scanners. My understanding is that if you have a scanner that scans
dark slides well, then you don't derive much benefit from pushing.
>
> Assuming your scanner scans dark slides well, pushing a film doesn't
increase the resulting S/N. My usual approach is to expose the film (e.g.
E200) long enough to adequately expose the unpushed film. By gathering more
light, I increase S/N. Also, I like to use the entire frame but my optics
vignette. In order to get the background exposure in the corners above the
toe of the emulsion, I need to expose long enough. Pushing will not help
much for that.
>
> BTW in general, color negative films are not designed for pushing and do
not benefit from it. However, many slides films are designed to be pushed.
See the film manufacturer's web site to obtain the data sheet for each type
of film that interests you.
>
> There is no one best film for astrophotography. The film to use depends on
what you're shooting, what features you want to emphasize, the focal ratio,
whether you choose to hyper, etc. Even for a particular type of film, you
will see conflicting stories in the APML archives, even by experienced
astrophotographers. That said, I think you will find more current
information about the best films for AP in the APML archives than anywhere
else.
>
> Matt
>
> At 08:41 PM 10/21/2002 -0400, Jose Miguel Benito Huete wrote:
> >Hi Robert, I am starting using E200 and as I am reading your message a
question
> >comes to my mind: Does it make a big different to push E200 one stop, or
in
> >other words do I have to always push it at least one stop? By the way I
read
> >your book and is very good. After reading the section on different films
for
> >astrophotography I don't which color film is best suited for this task
> >considering both negative and slide films. Do you have the answer for
this?
> >Many thanks
> >Jose Benito
> >Madrid
> >Spain
>
> --
> Matt BenDaniel
> matt@starmatt.com
> http://starmatt.com
>
>
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