Film speed testing question using waybeyond excel sheet
film graphs2.pngHi All,
Need a little help here. I am using Ralph Lambrech's spread sheet to determine my film speed.
A 21 step wedge was contact printed Hp5+ at f/8 .7 seconds in Xtol 1:1 @20c for the 4, 5.5, 11, and 16 minute intervals.
Could someone who is familiar with this procedure look at my graphs and tell me what is wrong? I am thinking my exposure is still too short as I am missing too many data points in the shorter development times?
I have a macbeth TD500 and I zeroed using the instruments light source. A calibrated step wedge indicates measurements are accurate.
Any help would greatly be appreciated.
Last edited by padraigm; 01-31-2013 at 12:58 PM. Click to view previous post history.