Re: Astro images on micro film?

If you take a picture of a negative astrophoto using 35mm B&W film and
make the galaxy take up less than 30% of the field, then the negative
would contain a <1cm size image. However, I suspect that you meant 1mm,
rather than 1cm. That could be tough because film wouldn't
have many resolution elements in an image that size. Therefore, I
suspect that a thing to do is to build a "microscope" with a lower-power
objective. Let's suppose you want to use a 10mm eyepiece as the
eyepiece. If you want a 1cm image to subtend a field of view of, say
45deg, then the real image at its field stop would be something like 8mm
across. Thus, your objective would need to be 0.8x. A 1x objective
is, essentially, a relay lens, which you can buy or make with 2 or 4
achromats. I suspect the length would get unwieldy if you build it
using the
simplest relay-lens designs, but you can buy relay lenses, which, after
the exhibit, can be used for other things. Look 'em up in Edmund Optical,
for instance.
    mam

On 6/11/2009 4:01 PM, Jake Burkart wrote:
> So my great boss decides we need to setup an exhibit here at NASA
> where kids can look through a microscope and see astro images. I
> guess it'll get their minds churning about macro and micro. Anyway,
> we've discovered that viewmaster slides are way too big for even the
> cheapest of microscopes. Anybody got any ideas of how to shrink a
> galaxy to less than a centimeter?
>
> --
> Jake Burkart
> Multimedia Director
> The Collaborative
> 650-938-8016
>
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