Re: [APML] RG200 Alert

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

Tim and Philip,
It's not all that bad.  RG200 (the new stuff) when hypered fully is still a
very good film.  The Kodak data was taken at 1/50 second.  When you hyper
it, it is a new film.  It's just not as good as it used to be.  But it is
still better than Supra400 for longer exposures.  For shorter exposures, use
Supra400 unhypered.

BTW the red LED I used to test RG200 and Supra has a spectrum that peaks at
654.8 nm with half intensity at 641 and 665 nm.  Red response is down from
the "Old" film, but still pretty good.
Don
----- Original Message -----
From: "Tim Hart" <Tim.Hart@haworth.com>

> Maybe it's time we push for a Film for Astronomy use ONLY.
>
> >>> philip@astrocruise.com 08/07/02 02:35PM >>>
> Oh Gawd, this is depressing isn't it.  The OIII was poor before, now
> they've made it even worse.  The Ha was good before, now they've flushed
it
> down the pan.  Looking at these curves, I think they've re-jigged the
> formulations for pure aesthetics - good skin tones, etc.  There seems to
> have been no attempt to make the film respond accurately to the visible
> spectrum.  Notice the way they have cut the red at around 630nm - that
must
> be to do with skin tones - removing blotchiness, etc.
>
> Anyway, thanks again Joe for the good presentation, even if it is mighty
> gloomy :(
>
> --Philip
>
>
>
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