Re: [APML] More film tests

[georgea@cam.org]

Hi Jeff

When I get home from work today I'll re-wash my negative strip, scan both 
frames again, and post the filtered and unfiltered images for comparison.
I had looked very briefly at the traffic film, but a comparison to SFX-200 
indicates that it is the same emulsion on a thinner and tougher film base. In 
fact if you print out the PDF files for the two films the spectographs match 
100%.
So far it looks like it will be a clear night again so I'll do a better polar 
alignment and try shooting the same area around Deneb with a 135mm lens.
I may need more than four hours sleep so the film may not get developed until 
wednesday evening.

George

Clear skies and good health 



Quoting Jeff Crilly <jlcapml@sbcglobal.net>:

> I understand from the page that the image shown is with the lumicon filter,
> correct?
> 
> What does the unfiltered image look like?
> 
> Interestingly enough, this is available in 120 format. 
> I may get some.
> 
> Btw, this "traffic surveillance" film looks pretty good...
> http://www.ilford.com/html/us_english/pdf/sp816t.PDF
> 
> Spectral sensitivity curve runs from about 400nm to 750nm.
> It is available in 35mm.
> 
> I've read on the web
> 
(http://www.pauck.de/marco/photo/infrared/traffic_surveillance_films/traffic_sur
veillance_films.html)
> that this is the same (or similar to) SFX200, which you've tested.
> 
> However, SP816T is a 400 speed film.  Maybe it will work?
> 
> Probably a special order film, anyhow.
> 
> ----- Original Message ----- 
> From: "George Anderson" <georgea@cam.org>
> To: "APML" <astro-photo@seds.org>
> Sent: Monday, August 23, 2004 9:19 PM
> Subject: [APML] More film tests
> 
> 
> > I have done some more testing of the Ilford SFX-200. It does improve
> > with both pre-flashing and vacuum baking. But even the combination of
> > the two still doesn't make it suitable for AP work. I have a partial
> > roll remaining which I'll test for hypering when my gas arrives in
> > another two or three weeks.
> > On the plus side I did a very quick test of Ilford's Delta 400 film,
> > initial results with it deveoped at 800 ISO look promising. Results of a
> > very quick shoot can be seen at
> > http://www.angelfire.com/space/lunatic/delta_400.htm .
> > If the weather holds and the moon doesn't interefere too much I'll run
> > some more tests tomorrow night with the HA filter and a 135mm lens (with
> > better alignment if time allows).
> > 
> > George Anderson
> > Montreal Canada
> > 
> > Clear skies and good health
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