Re: Step wedges
Judy Seigel (jseigel@panix.com)
Fri, 22 May 1998 14:24:40 -0400 (EDT)
On Fri, 22 May 1998, Keith Schreiber wrote:
>
> Okay, Dwight. I've been thinking about this all day and I think I've got it.
> You need a sheet of film with even density of 0.15 cut into 20 strips of
> whatever width you like - let's say 1". Then let's make each step 1/4" wide
> so then we cut the 1" wide strips into pieces of 1/4, 1/2, 3/4, 1, 1 1/4, 1
> 1/2, 1 3/4, 2, ..., and 5". There are only 20 because for step 1 (which
> approximates unexposed film base) we'll use a piece of 0.05 density. Here is
> a diagram:
>
Keith, that is extremely ingenious & if I'm ever cast adrift in a life
boat without the handbook, hope you're there.... but what about the film
base plus fog... wouldn't that throw your higher steps off?
cheers,
Judy