I've been trying to get dialed in on the affect of a shade 10, welding glass as a ND filter. I metered it as -9 but the highlights barely showed up on the negative. I tried 12 stops on this one.
1. The sun was about 40 deg high, camera left. It was behind a tree but kept finding little holes to peek through during the 7 minutes of exposure. That accounts for the several spots of lens flare. I should've shaded the lens.
2. I actually got the exposure right. My aim was to put the shadow area under the awning in zone III. I metered the sky at about 3.5 stops above that so, with a 2 stop ND grad filter it should've worked. Wrong. This was a 7 minute exposure through my welding glass filter. The reciprocity failure is exponential so two stops would show up more like 5 stops (or more). I hadn't thought of that. I don't believe I'll be using NDG's with the 12 stop anymore.
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