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kevindar wrote:
OK Gang.
So, this was shot in Av mode. Metering and comp here is not an issue desipite being shot in av mode. both are identical exposures, as far as the camera is concerned. both are iso 400, one is 1/1600 sec, f 6.3, and one is 1/2000 f5 (1/3 stop difference in apertaure compensated by 1/3 stop difference in shutter speed).
Now the difference in framing has probably led to camera choosing the same exposure in the two scenes. if the scenes were framed identically, the camera would have chosen 1/3 to 1/2 exposure longer for the 16-35 f4 lens, b/c of the t value of the lens (not that the camera knows about it, just think of it as having a .5 stop nd in front of the lens.
So, the t stop, does not lead to darker exposures, but longer exposure times, will all else being the same, compared to a lens with a lower t stop.
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Metering is ALWAYS an issue when this test is not standardized. Canon evaluative metering does whatever the hell it pleases and gets it somewhat right most of the time, sometimes. A real test would be to show us the actual photos taken in full manual at the same settings with both lenses.
The actual answer is to just preset your metering to expose to the right.
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