RE: [APML] an interesting new slide film for deep sky

["Lane, Jason R" <jason.lane@navy.mil>]

granularity = std deviation of a population of density values for a processed layer measured at many places using a suitable sampling aperture.  Yeah, doesn't really mean much except I think it's ok to compare values for similar media.

If you get a chance to use that film, please share the results :)  I like how Fuji seems to put extra effort into taking care of reciprocity failure in their new films.  I think that shows why Fuji's made so many inroads into the film market once owned exclusively by Kodak.  

Cheers,
Jason

-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Wei-Hao Wang
Sent: Monday, September 20, 2004 6:23 PM
To: APML
Subject: [APML] an interesting new slide film for deep sky


After Kodak discontinued E100S and TP, I don't want to rely on it any more. 
Fuji is the way to go.

Fuji just announced a special version of its ASA50 slide film, Fujichrome
Fortia.  It comes with 120 and 35mm formats.  It's a limited edition.  Fuji
will only produce 250,000 rolls of 35mm and 100,000 rolls of 120 formats.
Fuji claims that this film has high resolution, high contrast, and very 
saturated original color.  (I don't know how can an original color be very
saturated, though.)  Its RMS grainularity is 10.  (This doesn't mean too
much.)

According to the test in a Japanese astronomical magazine, this film has 
good reciprocity failure properties for all RGB colors.  It's H-alpha 
sensitivity is very good, probably the best you can expect from an ASA
50-100 film.  In a +2 pushed exposure of 75 mininutes at F2.8, the NA 
and Cyg Gamma nebulas shows up very nicely.  The Milky Way in the 
center part of Cygnus is over-exposed.

Because of its low ASA speed, probably this film is not for F>4 prime-focus.
I can imagine it will do a good job on Schmidt cameras or fast camera lenses 
for deep sky.  Its saturated color is also good for star trails.

Its unclear if this film will be introduced to the US.  

Cheers,

Wei-Hao

-- 
________________________________________________________________
Wei-Hao Wang  :)

Institute for Astronomy at University of Hawaii

Address:                       
2680 Woodlawn Drive         Personal Website:
Honolulu, HI 96822             http://www.ifa.hawaii.edu/~wang
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