Re: [APML] science value of 35mm slides

["Michael Barlow" <mikeba@rochester.rr.com>]

    I got overly excited!  I have a small hand held viewer (2x or 3x) for
35mm slides and one appeared to have pin point stars all across the field.
So, I had the slide scanned on to CD and had a print made of it.  had this
been truly pin point stars across the entire field I could, at the time,
imagine it being used for star movement over time or to fill in a catalog of
current star locations as well as many other possibilities.  The print came
out nice but looking at the CD and magnifying the image many times I see the
stars are pin points only about 1/2 of the field (can be cropped).  I'm
going to have it scanned again by someone who knows how to scan star fields
as opposed to a local photoshop so that I can have a better picture to
study.
Thanks Jerry,
Michael A. Barlow

----- Original Message ----- 
From: "Jerry Lodriguss" <lists3@astropix.com>
To: "Michael Barlow" <mikeba@rochester.rr.com>; "Discussion of Film
Astrophotography" <astro-photo@seds.org>
Sent: Tuesday, March 22, 2005 3:49 PM
Subject: Re: [APML] science value of 35mm slides


> At 10:34 AM 3/21/2005, you wrote:
> >     My inexperienced enthusiasm makes me want to continue on the track
of
> >scientific value but at the same time the little experience I do have
want's
> >me to question their value....  One of my goals with photographing, and
> >hopefully before my death, is to have at least one photo used for some
kind
> >of scientific use.  Maybe for tracking star movement, or for cataloging
> >stars, or even for a classroom environment of some kind.  Something that
> >says the effort I have made in getting good sharp pictures today pays for
it
> >self in the future by being used by my self or someone(s) else.  So My
> >question is;  Have 35mm slides been used in the past for scientific uses
> >other then just pretty pictures?
>
> Yes, you can make scientific discoveries with 35mm slides.  Things like
> comets and nova.
>
>
>
>
>
> >Have they been used for cataloging star
> >positions,
>
> Yes film has been used for this, but very long ago. It's not used for this
> anymore.
>
>
>
>
> >have there been any discoveries made with 35mm slides, ect..
>
>
> Yes, many... comets and novas
>
>
>
> >   A
> >second and related question; At what point is larger formats better then
> >35mm?
>
>
> Depends. Bigger film at a given focal length covers more angular area, so
> you could search more area of sky per exposure.  At what point it's better
> is a complicated question that can probably best be answered by the
> indiviudal photographer.
>
>
>
>
>
>
> >Basically, how much scientific value is there in 35mm slides?
>
> Some. It depends on how dedicated you are personally to doing science with
> it.  Not many other people are going to look at anything an individual
> amateur astrophotographer shoots and try to do science with those images.
> You have to do the science part of it yourself. Then it has as much value
> as the quality of your effort.
>
> Jerry
>
>
>
>
>
>

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