Re: producing b&w slides using negative film and a slide copier

Juha Juntunen <juhajuntunen@xxxxxxxxxxxxxxxx> wrote:
>
> "Peter Irwin" <pirwin@xxxxxxx> wrote in message
>> >
>> > You should copy the negatives onto motion picture print film:
>> > Eastman 5302 Fine Grain Release Positive costs about
>> > 15 dollars a roll from Kodak. It is essentially enlarging
>> > paper emulsion on a film base.
>>
>
> Thanks for the pointer. I was not expecting to use this kind of film, but
> hey, the price is great and if it works - I better try it at some point.
> Availability might be a problem for me right now, but the next time I visit
> the US I should be able to get it, if not before.

I don't know where you live, but Kodak has offices all over the world.
Just call your local Kodak supplier and ask how you can order some.

>
> Is it then so that normal B&W film does not work so well? Is the problem the
> film grain, or does it just not look right when projected?

Normal B&W negative film has a contrast or gamma of less than unity,
probably around 0.55 to 0.65. You want a final gamma for projection of
around 1.6, so your print film needs to have very high contrast.
5302 has a gamma of around 2.7 to 3.0 in Dektol.
0.65 x 2.7 = 1.755 which is about right.

Using two negative films would give you very low contrast.

Peter.
--
pirwin@xxxxxxx
.

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