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04-23-2009, 08:14 PM   #1
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sigma 10-20 underexposured images

I have just bought a sigma 10-20mm from the forum and today i had a few minutes to take a couple of test shots - feeling lazy i just set the camera to auto and fired a few shots which turned out underexposed:

If i set the exposure to 0.5-1 above the images appear much better. Anyone else having this problem? or had?

heidi

04-23-2009, 08:30 PM   #2
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He is an example of what i mean:


[IMG][img=http://img2.imageshack.us/img2/6551/005nom.jpg][/IMG]
04-23-2009, 08:33 PM   #3
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Slight over or underexposure with certain lenses is very common. Don't worry about it. The behaviour is usually constant so if you know your lens, it shouldn't be a problem. More important is where you take your meter from in the image. If you meter from the sky, the ground will be underexposed. If you meter from the ground, the sky will be overexposed.
04-23-2009, 08:36 PM   #4
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I think those white clouds are the reason. Pentax cameras are known to cut back on the exposure in order to avoid blowing highlights. This is specially true if you have the exposure setting on multi point exposure. Perhaps you get closer to what you think it should be by using the "average" eposure setting.

04-23-2009, 09:18 PM   #5
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Not just the clouds, but the sky in general is causing the camera to expose the way it is. If it exposed the forground to look good, you'd lose most of the color in the sky. Maybe that's what you wanted, but the camera can't read your mind. How is it supposed to know you didn't *want* a well-exposed picture of the sky with a dark foreground, as opposed to a well-exposed foreground with a washed out sky?
04-23-2009, 10:13 PM   #6
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You can use Graduated Neutral Density filters to obtain a more even exposure for the sky and ground.
04-24-2009, 12:08 AM   #7
axl
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agree with what's posted above. 10-20 has so great FOV that it's very easy to have something bright in there that'll throw off the metering, especialy when using multisegment metering. Try to stick with spot or CW metering and meter of neutral tones before taking shot.... But 10-20 still may need 0.5-0.7 + Ev compensation...

BR
04-24-2009, 01:02 AM   #8
James S
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G day Heidi.

I've found with most of my sigma lenses I've owned, including the one you have that in certain conditions, you need to push the EV +/- up or down. I wouldn't be too concerned about it.

Enjoy the lens.

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