Re: [APML] A small print film test...

[George Anderson <georgea@cam.org>]

Hi Pat

Many thanks for the film test results, they are very much appreciated.

I have managed to do some further testing on some B&W films with less
than acceptable results. Due to the fall drizzle I ended up building a
LED box for film testing. The results were more repeatable than the
seeing that we have been having.
Ilford SFX-200: No matter how you hyper it (short, long) all you do is
build up background fog. After browsing some of the daylight photo lists
I have found comments that the reciprocity rate approaches  10 to 13
stops after 2 seconds.
Adox Bluefire Police: Very red dead, even in daylight. Hypering does not
help in any wavelength where the film is sensitive. I have a few rolls
left and will give it a try for lunar photography. At ~64-80 ISO it is
pretty slow but the resolving power is great. One quick shot of the moon
one night through my undriven f/8 dob says the film shows some promise.
Ilford Delta 400: Red response is good, reciprocity not so good.
Hypering builds background fog. I have one more roll that I will re-run
some tests with. I found a flaw in my testing. The two Ilford PDF
pamphlets I have give different times for HC-110 development to the tune
of about one stop. I'll re-test it straight and incremental hypered with
the developing time in big letters pinned to the wall. 

I have a couple of rolls of 400TMax TMY that I will try hypering unless
someone has already been down that road.

I was in touch with a Kodak micro-film technical support manager who is
going to look into 35mm perforated films that have 656nm sensitivity.
They have a wonderful film which looks perfect, except that it only
exists in 16mm unperforated. Anyone shooting AP with a Minox?   :^) He
is going to check with their other divisions for fine/super fine grained
B&W films which may meet the B&W H-Alpha requirements.

I have managed to confirm that my hypering rig works, I have run a few
short rolls of TP through my camera. The long exposures with the H-A
filter showed a few problems with my setup that I am in the process of
correcting.
I did one quick and dirty experiment, three unguided long exposure 50mm
shots of cygnus. One through the Lumicon  photographic H-A filter, and
two through Lumicons H-Beta and OIII visual filters. When all three were
roughly aligned in photoshop as a colour image the results were very
encouraging. No threat to Rob G, Richard C, and others, but it will
allow me to shoot false colour and go deeper under my light polluted
skies. Too bad I'm limited to short wide field only with these filter
diameters.

George Anderson
Montreal Canada

Clear skies and good health
Patrick Freeman wrote:
> 
> Hi folks,
> 
> I recently had a chance to do a little more film testing, and just published
> the test shots (M20) to my website for reference.  Here's the link:
> http://home.woh.rr.com/pfcf/latest_film.htm
> 
> I tested Fuji Super HQ200 and Kodak Ultra Color 400.  The short version:
> UC400 is awful and HQ200 looks really promising.
> 
> As some of you may remember, I've tested many films off and on over the last
> 3 years.  Mostly, I've shot M31, M45, M42, and M20 as test objects,
> depending on my location, date, and time when the film was used.  The page
> above shows the most recent films, although prior to the above two films it
> has been quite some time since I've published any test results.  Anyway,
> hopefully these results will be of benefit to you all.
> 
> Keep looking up,
> 
> Pat Freeman
> pfreeman@woh.rr.com
> 
> _______________________________________________
> Astro-Photo mailing list
> Astro-Photo@seds.org
> http://seds.org/mailman/listinfo/astro-photo
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo