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04-19-2016, 02:42 PM   #1
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Kx metering error

Shot some Kx this weekend and a few of the exact framed shots were much darker. These were shot about 2-3 seconds apart but nothing changed except car number. In looking at the EXIF data, the dark shots were at F22/1:4000 while the correct shots were at F9/1:3200? same shot composition...? Most others came out but in looking at the "proof sheet" collection, they exposures are all over the board.

04-19-2016, 02:46 PM   #2
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That's a huge jump! Were you in spot metering mode by any chance?

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04-19-2016, 03:24 PM   #3
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I was in "action" mode to capture 90 mph Indy cars in a turn. Im not sure if any other variables were changed off the action mode.
04-19-2016, 05:24 PM   #4
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Also if more or less of a bright skyline / sun say is in the frame it can make that sort of difference.
I found I had use a lot more exposure compensation on my K-x that I do with the K-5 (which clearly has superior automatic exposure).

Not sure what exposure mode action scene mode uses but it might be centre weighted.

04-19-2016, 08:21 PM   #5
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here are a few, tried to keep the composition the same. Any ideas? Is the sun flare in the middle tripping the metering up?
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04-19-2016, 08:35 PM   #6
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QuoteOriginally posted by pishta Quote
here are a few, tried to keep the composition the same. Any ideas? Is the sun flare in the middle tripping the metering up?
Some EXIF data would be nice.
04-20-2016, 08:52 PM   #7
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had to look at originals as EXIF doesnt carry over to google pic links: in order...
f16 1/3200 ISO 1600
f22 1/4000 ISO 1600
f40 1/4000 ISO 1600
f13 1/3200 ISO 1600
04-21-2016, 06:08 PM   #8
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QuoteOriginally posted by pishta Quote
had to look at originals as EXIF doesnt carry over to google pic links: in order...
f16 1/3200 ISO 1600
f22 1/4000 ISO 1600
f40 1/4000 ISO 1600
f13 1/3200 ISO 1600
Well, that's some exif data. I was thinking what metering mode were you using for that sequence?

04-21-2016, 11:17 PM   #9
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Doesn't look like that scene mode is coping very well at all. ISO is too high surely for such a bright day? A good time for some more photographer control

I'd suggest you might have better control with Tv mode and a fixed ISO. What about ISO 400, and about 1/1500 sec....? That should bring your automatically set aperture back to better figures, at around F5.6 to F11. You can finely control the shutter speed to freeze the movement or blur a little if you want, the aperture variations won't matter too much. If you find that you can't get things bright enough then you can bump the ISO another stop to 800.

Check the metering mode as suggested earlier also. The multi-pattern mode would be best I think, and help reduce the impact of bright sun hotspots.
04-22-2016, 07:38 PM   #10
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Metering was just full auto/scene mode of action. Sorry, no other tinkering with the camera, just grabbed it, set it to action and snapped away. 95% of the shots were correct or close, just a few were terrible. I shot the same event last year with a Fuji S3 and all 250 were perfectly exposed, in P mode. Maybe a little more control as the shutter was a constant in that mode.
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