Re: [APML] Re: Supra 400, was: new films

["bert katzung" <katzung1@home.com>]

Hi Tony and List:
I haven't yet processed any results with the Supra 400 that I hypered, but
I've gotten reasonable colors with unhypered stuff in 30 minute to one hour
exposures. See
http://www.astronomy-images.com/images/Nebulas/M8-M20.htm
http://www.astronomy-images.com/images/Nebulas/m27.htm
http://www.astronomy-images.com/images/Nebulas/North_America_Nebula.htm

As I recall, the blue in M20 required some selective stretching, so it may
be weak in blue. I know you're working at f8 and admittedly the M8-M20 and
NA were done at f4.5, but the M27 was at f12 (two 30-minute shots), so I
think that this film would meet your 1 hour limit criterion. What hypering
does to the color I don't know. I may have some images in  some stuff
waiting to be scanned. I'll check....
Bert

Bert Katzung
katzung1@home.com
www.astronomy-images.com




----- Original Message -----
From: <Tonyhallas@aol.com>
To: <astro-photo@seds.org>
Sent: Thursday, 23 August, 2001 1:47 PM
Subject: Re: [APML] Re: new films


> Joe,
>
>     I am afraid those sensitivity curves are useless for
astrophotography...
> they never
> anticipated exposing the film for one hour, and they never considered what
> hypering might do to the film. Royal 400 and Supra 400 are like night and
day
> in actual tests... the Royal 400 has the cleanest color of any astro film
I
> have seen, the Supra is a disaster... go figure.
>
>      Tony



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