Without doing calculations, since it's Saturday morning and I have to head out...
I added the 2 stop ND filter (it's the filter that gets my exposures to be 0.1 near the last few steps) over my flashmeter and metered the EG&G with meter set at ISO 400.
It recommended f/2.0 at ISO 400, you might have set the meter at ISO 100 so that you can get EV readings. If so... That accounts for the two stops difference in the plan.
So this is the light "without" the Stouffer scale... Just at the glass of your contact frame...
If you choose to aim for f/0.7 instead of f/1.0 that isn't significant... It validates your calculations.
Once you get a strip developed, you can always "count steps" to adjust exposure up or down. On your scale 0.1 density is 1/3 stop, so for each step you count from the step you wanted to be on... is just 1/3 stop more or less depending whether you want to go up or down the scale.
Last edited by Bill Burk; 09-22-2012 at 11:43 AM. Click to view previous post history.