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Okay, so last week I exposed 3 sheets of FP4+ under what I metered as EV4 @ ISO 125 (my meter updates displayed EV value as you change ISO), developed it in my Jobo @ 70F in DD-X diluted 1+6. After I let everything dry and read my density values into the Plotter program, the ISO point landed at almost 2.7 (looked like 2.69 or so to me). So, I thought: ~2.7-2.4 == ~0.3, or almost 1 stop over exposed. I re-exposed three more sheets, this time with my meter reading EV 3.1 @ ISO 125 and re-did the whole deal. Now the ISO point is almost all the way to 2.2... What's the deal? Shouldn't a one stop reduction in exposure move the ISO point .3 on the X-axis?
Maybe it's time for my meter to go on a vacation back to the nice folks at Gossen for a re-calibration. Either that or am I just going crazy? |
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