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Metering with Lens Filter Oddity

km6xz

St Petersburg, RU
3559 posts

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"RE: Metering with Lens Filter Oddity"

km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009
Mon 15-Oct-12 05:05 PM

Did the CPL cut the glare at some setting? Were you using it for saturating the sky more, or cutting the reflections from the chrome work?
The T-stop of a lens with a CPL jumps a lot but does not change the DOF like increasing F-stop. So ISO goes up or shutter gets longer for the same exposure. At least 2 stops difference. At some point, of maximum attenuation of some angle of reflected light several stops of attenuation can occur of the reflected light if you are adjusting while looking at those hot spots. If you were adjusting for sky, the CPL would probably not help the strong glare from the grill. The reason I asked if it made a difference, the grill on the Bird is almost clipping highs even with the underexposure of the rest of scene. That is being metered and dropping shutter speed(you mentioned AP mode)so the whole scene is underexposed except the very bright grill hot spot.
Noticing the hot spots and tending to them with either adjusting the CPL for a few stops of selective attenuation or moving to be off axis of the reflection would have brought your overall scene exposure back up. So assuming no major hot spots to fool the meter, you still need to add some positive EC to get white paint white.
Shooting under blue skies mid-day is tough, lots of reflections, harsh shadows, etc.
Did you had A-D-lighting on?
Stan
St Petersburg Russia

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A general, generic topic Metering with Lens Filter Oddity [View all] , Bravozulu , Thu 04-Oct-12 12:21 AM
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