RE: [APML] Fuji Provia 400F and exposure time

["Jeff Ball" <jeffball@astro-photography.com>]

Hello Nicola,
I know what you mean about wasting sky time.  About 2 years ago I went
with extended exposures on an f8 system with E200 and Provia.  I had
data ranging from one hour to 105 minutes.  I was imaging at Cherry
Springs State Park in PA which is considered one of the best dark sky
spots in the eastern US.  I found a negligible benefit with exposing
longer than 60 minutes.  That is why I switched to an f6 system.  My
advice is to shoot with optics as fast as you have for no more than 60
minutes, even under dark skies.  Maybe a bit more than 60, say 70, but I
wouldn't waste much more time than that.  One person's experience...hope
it helps.

Best regards,
Jeff Ball
www.earthandskyphoto.com


 

> -----Original Message-----
> From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]
> On Behalf Of centaurus_a@virgilio.it
> Sent: Tuesday, July 06, 2004 8:02 AM
> To: astro-photo@seds.org
> Subject: [APML] Fuji Provia 400F and exposure time
> 
> Dear all,
> 
> I always sticked to the rule of thumb of the square of the f/ratio for
a
> 400 ASA film, but I was wondering if, on a top of a mountain (1900
meters
> a.s.l.) with clear sky it would be better to push the esposure a bit
more
> of , let's say 1.5 times...especially with Provia 400F which I don't
know
> if it's reciprocity failure is much higher than, for instance, E200.
> Unfortunately I go to this place only once a year and I don't want to
> "waste"
> time in sky fog testing so I need a good estimate beforehand.
> 
> Any opinions?
> 
> Regards,
> Nicola
> http://astrofoto.laza.it
> 
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