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      06-15-2012, 01:22 PM   #3439
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Drives: '09 Cpe Silverstone FR 6MT
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2009 M3  [4.00]
Originally Posted by The1 View Post
your ETs don't have lenses in them do they? I haven't experienced a loss of light.
I'm pretty sure you do. The f-stop won't change, but try a manual setting with and without the ET and notice the EV reading. I think you'll see the EV drop. It's not the optics, but the distance of the rear element from the sensor.