On Feb 25, 4:06 pm, Father Kodak wrote:
On 14 Feb 2007 18:50:15 -0800, "Steven Woody"
wrote:

i am so happy i now can home test speeds of b&w negatives. i adapted
the method from Adams's books which told me how to find 0.1 density
point on the negative by using a lightbox and a spot meter. it's
great.

Which of Adams' books? Can you summarize here?

Thanks,

Father Kodak


in 'The Negative', Adams introduced a method of using a spot meter to
measure film density. 0.3 unit of EV difference ( in log_2 ) in your
meter means density difference of 0.1 ( in log_10 ). that's it.