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Flash Test with Backlighting | by PaulSteinJC
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Flash Test with Backlighting

I constructed a backlight/glare flash test. The parameters were: flash/no flash, AV/Manual and Metering Modes(evaluative, partial, spot and center weighted average).


With no flash, Spot was the best choice for AV and Manual.


In AV mode with a flash, the best metering mode choice was Center Weighted Average. Although, evaluative and partial were also fine. Spot did not perform well with Flash in AV mode.


Manual with flash performed the best at about +2 stops of flash. The metering mode selection made little difference in Manual with a flash.


All @ 28mm on a tripod



Glare Test Conclusion:


Use AV/TV, partial metering and a flash pointed at the subject or slightly up. This provides about 2+ stops of flash, depending on the strength of the backlight/glare.


Manual, spot metering and +2 stops of flash gives similar results.


Set flash to high speed sync (HSS) when shutter speed exceeds 1/250. Stopping down the lens or using an ND filter is better than HSS. Fighting the sun with HSS will drain the batteries.


Let E-TTL II figure out the optimal flash with its evaluative metering algorithms.


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Taken on July 1, 2012