Re: [APML] What's the Longest Exposure for an ASA 800 Film

[Ray Butler <ray.butler@nuigalway.ie>]

Darren,

Wow! That is a really nice picture - but more importantly in the overall 
scheme of things, it's a pretty impressive colour performance for this 
film. How come it has never been mentioned on the lists of "current good 
astro films"?

I had no idea that NPZ 800 (which replaces Fujicolor NGH II) was so good 
in the red - it's not up there with E200, but it nevertheless looks 
almost as good as Provia 400F. I had reckoned that with its "4th colour 
layer", it would be just as bad as the other Fuji print films like 
Superia Xtra 400 or NPH 400.

There _is_ reciprocity failure there (I'd expect a "true" ISO800/f2.8/20 
minutes exposure to be way into the fog), but it is not too bad since it 
starts off so fast.

Plus it's available in 120-format - I had given up all hope of a decent 
MF film for colour print. If you've been following the current scanner 
thread, you'll have seen that with certain models/designs, negatives 
scan better that slides. Must get my hands on a roll and give it a try.

Ray "who is relieved at the first good news on films I've had in ages" 
Butler


Darren Talbot wrote:

> I've used Fuji 800 xtra for shots up to 20 min with great colour and
> no reprocity failure that I can see.
> http://www3.ns.sympatico.ca/dtalbot/astro/milkyway/teapot_milky_hirez.jpg
> 
> That link is a picture I exposed for 20 min. 50mm lens @ f/2.8 on Fuji
> xtra 800. I think it came out fine.
> 
> Darren
> 
> 
> On Mon, 4 Oct 2004 20:16:08 -0700, Thomas W. Earle <twade@bmi.net> wrote:
> 
>>In preparing for the Geminids, I'm trying to figure out what is the
>>ideal/maximum exposure at F/2.8 using NPZ Fujicolor 800.  I'll be
>>using a Pentax 67 camera so there's not too many film choices left
>>in the medium format arena, especially color negative films.  I have
>>a very dark sky with an elevation of 4000 feet.  Here's a link to a
>>light pollution map of my observing location:
>>
>>http://cleardarksky.com/lp/RttBttORlp.html
>>
>>I used some old Fuji NGHII 800 during the Perseids which I exposed
>>for 10 minutes, but a few shots seem a little muted; however, the
>>film is a little over a year past its expiration so I'm not sure if
>>I exposed too long or not.  I'll primarily be shooting around Orion
>>area which should be about at an altitude of 40-45 degrees at its
>>highest.  I plan on doing some testing over the next few months;
>>however, it's all dependant on mother nature.
>>
>>Any comments or advice would be greatly appreciated.
>>
>>Wade
>>
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-- 
Dr. Ray Butler (ray.butler@nuigalway.ie || ray@physics.nuigalway.ie)
Lecturer, Dept. of Physics || Computational Astrophysics Laboratory
National University of Ireland, Galway, University Road, Galway, Ireland.
Tel: +353-91-524411 ext. 3788   FAX: +353-91-525700

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