Re: Step Wedge

Is the 31-step wedge, mentioned, on a 4x5 piece of substrate? I was
thinking sandwiching this in front of film, in my film holder, and
exposing in-camera would also serve to help me conduct film tests...

BTW, anyone use this method of generating film curves and finding
film speeds? I'm assuming that I would be exposing an evenly illuminated
surface at zone X? I am a little cloudy on analyzing the results to
determine, first of all, my true film speed. I have access to something
akin to a densitometer to aid in checking resulting densities...

On Mon, Nov 01, 2004 at 09:33:39AM -0500, Sandy King wrote:
> If you are using a reflection densitometer to evaluate results make
> sure that the width of the steps to be read is not greater than the
> reading aperture of your densitometer. I would recommend the
> Stouffer TP 4X5 step wedge. It is available in both 21 step and 31
> step versions and allows a convenient test of 4X5" (with reading area
> 1/4" wide) to be printed. If the reading aperture of your
> densitometer is small enough you could probably make do with the
> small and inexpensive Stouffer T2115.
>
>
> BTW, Mark has recently produced in conjunction with Stouffer a
> 31-step tablet for precision digital negative calibration and it is
> very easy to read.
>
> Sandy King
>
>
>
>
> >Hi all,
> >
> >I am about to purchase my first step wedge for alt-photo. Mark Nelson's
> >book recommends the Kodak or Stouffer wedges. Due to price, I will be
> >buying a Stouffer 21-step wedge but the question is, which one is correct
> >for alt-photo work.
> >
> >Will the T2115C transmission step wedge be what I need?
> >
> >Thanks in advance.
> >
> >Oody
> >
> >_______________________________________________________________
> >When you hold the head of a snake the rest is nothing but rope.
> >
> >Akan (Ghana) Proverb
> >_______________________________________________________________
>
Received on Wed Nov 10 12:24:27 2004