PMK developer and Delta 100

I am new to B&W and this is the first time that I have tried to determine my own film speed and developing time. Here are my results:

20min at 20 C, 1:2:100 (parts A:B:water)

<p>

EI 50

<p>

Zone I Zone V Zone VIII

OD 0.12 0.85 1.24

0.10 0.88 1.26

<p>

EI 100

Zone I Zone V Zone VIII

OD 0.03 0.62 1.19

<p>

It would appear that EI or 50 is correct based on zone I readings.With the developing time of 20 min, zone VIII also looks pretty good, but zone V is too high. If I reduce developing time down to 15 min then zones I and V are OK (approx 0.1 and 0.65) but zone VIII is too low (approx. 1.1). Any suggestions on what I should change in order to get things right? By the ways, I am using a condenser enlarger.

<p>

thanks, mike

Somehow the formatting was lost:

<p>

OD values at EI 50

<p>

zoneI, 0.12 and 0.10; zoneV, 0.85 and 0.88; zoneVIII, 1.24 and 1.26

<p>

OD values at EI 100

<p>

zoneI, 0.03; zoneV, 0.62; zoneVIII, 1.19

<p>

hope that is more readable

20 minutes is probably too much development as

high values will be too dense. I use 14 minutes

@ 68. Remember, because the PMK negative has a

distinct greenish tint, you must use a COLOR

transmission densitometer. Note that your Zone I

reading, for EI 50, is 0.12, close enough to 0.1.

The best way to determine development time, is to

expose several sheets of film for Zone VIII (EI 50)

and develop for different times, starting at say

12 minutes, and going up to 20. The neg that prints

a Zone VIII value on normal (grade 2) paper is the

correct dev time. Use your paper of choice. This

fine tunes your dev time for you own system and

methods.