Re: [APML] Film comparison: image links fixed

[Axel Mellinger <axm2@canopus.physik.uni-potsdam.de>]

On Sun, 9 Feb 2003, Alan Voetsch wrote:

> I did a more informal test 2 1/2 years ago, instead of slide films I
> use fuji 800, along with with PJ400 and Supra. While you note that
> Supra was slower at picking up reds with 40 minute exposures, my test
> indicated that it was right around that time (30-40 minutes) that the
> other films stopped recording and the Supra passed them by like a
> rabbit. I shot at prime focus of a 10" LX200 f/10 though. I would have
> thought that this would have happened earlier at f/4, maybe not. I
> wonder if hypering altered the recording process.

Alan,

Don Westergren's test results
(http://home.nethere.net/mpd/FilmTestData/KodakSupra400.htm)
indicate that excessive hypering may actually *decrease* the red and green
sensitivity of Supra 400. I got the film from a commercial dealer, so I
don't have control over the hypering process. On the other hand, I was
mainly interested in getting a film with good blue response for objects
like the Witch Head nebula, and Supra 400 is certainly a good choice for
that.

Clear skies,

Axel


-- 
Axel Mellinger  <http://canopus.physik.uni-potsdam.de/~axm/astrophot.html>

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