Re: [APML] More bad film news

["Don Westergren" <westergren@netzero.net>]

George and all,

If any of these films show promise, I have my film testing equipment
available to check out reciprocity out to 4-1/2 hours exposure with the red,
green, blue-green, and blue LED light.  A key point in hypering films is
that no two films respond the same way, nor end up with the same recipe.
Some color films hypered in 2 hours while Tech Pan takes 100 hours, both at
50°C.  Also I found that a few films show a density change or darkening of
the rebate when fully hypered, but other films show no change at all.  The
only way to test an unknown film is to hyper it at several recipes and
expose and process the film.

I am willing to do the refinement testing to evaluate hypering recipes and
the overall film response for astrophotography.  But I can't afford the time
and expense to do it all myself.  I have the hypering equipment and some
forming gas, but will need to get a Lumicon refill soon if I resume testing
hypered films.

I suggest we combine forces to evaluate films.  George, you say you have
some films to test.  As you get your results, let us know and "we -
everyone" can coordinate efforts.

Contact me offline if you have any specific questions.

Don


> Ray
>
> I don't believe that films from any of these companies have undergone
> any true testing if any at all.
> Up until now there has been no true need as hypered Tech Pan has been
> the only film for fine detail B&W (although I could be wrong).
> What needs to be done is some true testing on the available B&W films
> much like Don Westergren and Robert Reeves did with colour.
> And we shouldn't just stop if a film doesn't work out of the box, we
> should test these films for hypering as well.
> I realize that I have been throwing the "we" around, but for any people
> interested in shooting B&W film after their stock of TP runs it should
> be a group endevour.
> In a two weeks or less I should have my tank of hypering gas at which
> point I will start hypering TP as well as drop some film chips in the
> tank to see if there is any change in background density in the 100hours
> that it will take my first test roll of TP to hopefully hyper. I
> presently have three film types to test and a line on a possible fourth.
> It may all pan out to zilch but the only way to find out is to test.
> The film types that Joe mentions are all easily found by a quick google
> search.
> Forte is available from the people who make Omega enlargers and from
> Eight Elm in Toronto. I have two rolls on order via a sister.
> Bergger is avaiulable from Bergger.
> MACO can be found at fine photographic shops, the type of places who
> stock 4 by 5 and 8 by 10 film plates as well as view cameras.
> There is also ADOX (Bluefire Police film in the USA) which is
> re-packaged microfilm with a special developer. It probably starts to
> roll off around 640nm, but it may fill in some gaps at other wavelengths
> where other films are weaker. The lack of grain is stunning.
> There is also Fomo who have an extended red film, which they openly
> admit suffers from reciprocity (didn't we have a treaty on that) but may
> "heal itself" with hypering.
>
> George Anderson
> Montreal Canada
>
> Clear skies and good health
>
>
>
> MACO, Forte, Bergger, Elk
>
> Ray Butler wrote:
> >
> >  > growth of companies like MACO, Forte, Bergger, Elke and others -all
> >  > too happy to jump in and fill the gap.
> >
> > But Joe, do any of these other companies make anything of use for
> > astrophotography? Have you tried their products, how good are they, and
> > where can you get them online? I'm sure many other APMLers would be
> > interested if you could provide us with some details.
> >
> > Ray
> >
> > --
> > 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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