Re: [APML] Diffusion Filter and Photoshop article

["westergren" <westergren@netzero.net>]

George and John,

I'm thinking about trying a couple of sizes of window screen or netting.  My
wife doesn't have any black stockings now, and I'm not brave enough to go
buy some.  Grinding glass sounds like work.  This isn't a high priority for
me, but my mind started wondering when I read Marco's article.

I need to use something black to prevent reflections if it's going in front
of the scope objective.  I have red LEDs and the autoguider display that
could reflect red light off anything not black.

Now that you mention it, a Monte Python sketch would while away the time
while shooting ... maybe better than sleeping?

Don


> George,
>     I believe that it was Chris Schur that made mention of the fact that
> Akira Fuji uses a nylon stocking as a diffuser for his work. This was the
> reason why I brought it up. (but Chris didn't mention what colour!) A
nylon
> stretched over a needlepoint round wooden thingy might make a simple full
> aperture filter, certainly simpler than rubbing two pieces of glass
> together. Plus, while waiting for it to get dark, armed with a nylon
> stocking you have all the tools you need to create your own Monty Python
> sketch..... :-)
>
> still waiting for perpetual twilight to end.....
>
> John Mirtle
> +51°N 114°W
>
> ----- Original Message -----
> From: "George Anderson" <georgea@cam.org>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Sunday, July 06, 2003 8:47 PM
> Subject: Re: [APML] Diffusion Filter and Photoshop article
>
>
> Hi Don
>
> You might (and this is only a guess) be able to make one by getting two
> pieces of plate glass that are larger than the front of your scope. Use
> one as a grinding surface and grind both sides of the piece to be used
> as a filter with 5 micron aluminum oxide and water. I wouldn't go the
> full grind but just enough to put a light haze on it. My reasoning for
> doing both sides is to hopefully reduce ghost reflections.
>
> George Anderson
> Montreal Canada
>
> Clear skies and good health
>
>
> _______________________________________________
> Astro-Photo mailing list
> Astro-Photo@seds.org
> http://seds.org/mailman/listinfo/astro-photo
>


_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo