[pure-silver] Re: Simple Step Wedge Testing
- From: Martin Jangowski <martin@xxxxxxxxxxxx>
- To: "Pure Silver (F) (E-mail)" <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 14 Mar 2005 20:09:59 +0100 (CET)
On Mon, 14 Mar 2005, Breukel, C. (HKG) wrote:
> Very brief : place a 21 steps Stouffer step wedge on top of your test =3D
> film in a 4*5 holder, aim camera at a uniformly lit surface, measure =3D
> (for Zone V), add 5 stops (so a Zone X exposure), and look if step 19 =3D
> gives you a just above max black on your printing paper (or if you have =
=3D
> a densitometer a density of 0.1 ). This will give your personal speed. =
=3D
> Than look were Zone VIII lands for determining your development time.
If your lens has no light falloff over the length of the wedge and the
shutter/f-stop combo is exactly what it says for each exposure, this would
be a neat system. After all, it is nothing more than a simple
sensitometer, just a step wedge with a uniform light source.
Gr=FC=DFe aus Hohenlohe,
=09Martin Jangowski
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