BTZS Film Test...

Is it ok to use 4 sheets (4:00, 5:30, 8:00, 11:00) instead of 5 sheets (4:00, 5:30, 8:00, 11:00 AND 16:00) for the film tests using BTZS PLOTTER?
Or, am I overlooking any behind the scenes math that might require the 5th sheet? 4 sheets cover my needs w/ regards to plus and minus development as it is.

Thanks

You need to have at least one curve outside your range, on both the slow and fast sides. So 4 curves would work, if you're pretty sure of your times. But I would think the more curves you input, at a smaller time increment, the more accurate the final results should be.

Eric

I cover my +2 to -1 with 4 tests and that suits my needs. I'll do further tests with a different dev/dilution for compensation.

Thanks for your help