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

["Renzo Del Rosso" <scrivimi@renzodelrosso.com>]

centaurus_a@virgilio.it Scrive: 

> 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?
Hello, Nicola.
I used both Provia Fuji 400 F and Kodak E200 last year duryng my holidays.
I take some pictures with the R200 SS Vixen at F:4 and I Did'nt found 
remarcheable differents in sky fog with the E200 (pushed +1) and the Provia 
400 (nominally exposed).
I take my photo in a dark skies (I saw M33 with my naked eyes) using 35/40 
minutes of exposure.
I could not shoot more cause I guided manually.
I hope this year to try longer exposure with the ST4 autoguide.
I hope this helps you.
Renzo 

www.renzodelrosso.com 

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