http://www.lance.colostate.edu/~dan/mirror.html (or see home page below)
This page has all of Al's descriptions of each picture.
Or, they can be found at:
ftp://archimedes.lance.colostate.edu/pub/astro
On Tue, 7 Mar 1995 kilian@ironwood.cray.com wrote:
> I have placed nine files in /incoming on archimedes.lance.colostate.edu
> They will be moved to /pub/astro sometime.
>
> 1_1.gif is a small image of my mirror. This image was taken with an
> Electrim EDC-1000 CCD camera and a short lens.
> This image is a single 16 millisecond frame
>
> 1_50.gif This image is an average of 50 16 millisecond frames.
>
> 2_20.gif This image is an average of 20 frames. after a further
> 1 hour polishing.
>
> 2_254.gif This image is an average of 254 frames.
>
> 3_80.gif is after a further 1 hour of polishing with a longer stroke
> This image was taken using a lens forcibly extracted from
> an old GAF 8mm movie camera I got for $5.00 at the local
> junk shop.
>
> This lens is a zoom lens, so I can change the image scale.
>
> This image is almost 165 x 192 (And I had xv double it)
>
> The lens had two prism devices in the light path.
> One is to extract a beam that hits a photo-diode to do
> automatic exposure control.
> The second one extracts another beam that is used for the
> through-the-lens viewing feature.
>
> When this image was taken, I had only discovered, and removed
> one of the two prism devices. The remaining device caused the
> diagonal line, and the circular rings.
>
> The CCD array window also had gunk on it that caused a few
> small blotches.
>
> I have since removed the second prism, and cleaned everything
> and I am getting much better images.
>
> 3_cnt.gif Is with the knife edge at the center of curvature
>
> 4_254.gif After anothe hour of polishing. CCD still not clean
>
> 5_254.gif Another hour... Finally got the CCD and lens clean
> The mirror is looking much smoother now.
>
> 5_cou.gif A Couder mask. Knife is at the 2nd zone from the center.
>
> -Alan Kilian kilian@cray.com
>
------------------------------------------------------------------------ Dan Doner | Office: 126A Glover (Engineering south) College of Engineering | Phone: (303) 491-1557 Colorado State University | dan@lance.colostate.edu |
<a href="http://www.lance.colostate.edu/~dan/index.html">Dan</a>