Re: Re: Orthochromatic Film for Pinhole Cameras

I have found that the ISO of kodalith or Arista ortho (from Freestyle) changes with
different developers. It is between 3 and 6 in high contrast developers like
Kodalith Liquid but the speed increases when I use a dilute Dektol. I use Dektol
at 1:7 and have found an ISO of 25 to be good. You can buy ortho from freestyle up
to 20x24 in sheets and they even have 36 inch x 200 feet if you want to make a very
large camera. The Arista brand works OK though I think the Kodak is better quality.

Guy Glorieux wrote:

> George L Smyth wrote:
>
> >
> > You could use Orthochromatic film. I use this on occasion and develop it with
> > dilute Dektol. This gives me a large negative that is easily printed.
> >
>
> George:
>
> What exactly is orthochromatic film? What size do they come in (e.g.
> 11x14?) What is the ISO? When you say you use dilute Dektol, could you
> be more precise about dilution, temperature, time.
>
> Sorry to ask these specifics, but it may come handy when I try to use my
> 11x14 camera.
>
> BTW, I've played around with 35mm Kodalith film acouple of years ago on
> my standard 35mm camera and got some very dramatic effects. I've
> experimented with processing - using a Kodak Grey card - until I got
> about four zones on the film (if you're familiar with zone system,
> standard film will give you ten zones of shade, moving from black to
> white, whereas kodalith will normally give you only pure white or pure
> black). I can't remember the actual dilution and times I used but I
> could pull them out from burried files. The difficulty with using
> Kodalith was the very low ISO (it turned out to be best at ISO 3, which
> means very long exposures on a regular camera and quite unpractical with
> pinhole at f-126...
>
> Best wishes,
>
> Guy Glorieux
>
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Chris Peregoy | http://www.gl.umbc.edu/~peregoy | http://imda.umbc.edu/