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08-05-2012, 03:26 PM   #1
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Camera setting too slow shutter speed

I recently purchased a Sigma 24-70 mm lens for my k10d. When I set the camera to aperature setting with a 2.8 aperature setting for outside on a sunny day, the camera sets the shutter speed to 1/30 sec. How do I correct this????? And...why is this happening. Thanks in advance for the help.

08-05-2012, 03:57 PM   #2
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It depends on which mode you use. Are you using the full auto mode? The camera sees that you are using a 24mm and therefore counts it as 1/30 is sufficient to reduce any camera shake to an acceptable level. Try a different mode like manual.
08-05-2012, 04:28 PM   #3
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F2.8, 1/30sec on a sunny day, the metering is way off on this lens/body combination. Try shooting with a different lens to see if the camera meters differently - attempting to determine if the problem is with the camera or specific to the Sigma 24-70.
08-05-2012, 04:54 PM   #4
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You don't mention the iso--and if you used iso 800 at f/2.8 likely the shutter speed is about 1/12,000 s--and I don't know what the camera does when the speed is greater than camera's top speed. Other than that suggest you follow (above) excanonfd post.

08-05-2012, 05:55 PM   #5
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Are the pictures properly exposed? or is the exposure way off?
08-06-2012, 01:12 PM   #6
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Ernie

Hi;

I took my first photograph with my father's Leica in 1940. He made all the settings and place it carefully in my hands. I began serious photography in 1949 with an 8x10 view camera.

Now, Jed, if you are getting 1/30 of a second at f/2.8 outside on a sunny day, either the camera was set on manual or there is a defect in either the camera or the lens. If you get correct exposures with other lenses then the problem is with the Sigma. Assuming you were at ISO 100, at f/2.8 you shutter speed should have been over 1/3000 of a second.

I use the Pentax 16~50 f/2.8. A bit pricy but an incredible lens.

Ernie
08-09-2012, 06:51 AM   #7
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I agree with Ernie, outside on a sunny day at f2.8 you should get a lot faster shutter speed than 1/30. With my Vivitar 200 a f8, ISO 200, I usually get 1/500 to 1/1000 depending on just how bright it is. Yesterday at 10AM I was getting 1/1000 at f8 under clear skies.

Something is wrong. My first question is what mode is it? Manual would certainly account for it, your shutter speed simply stays where it is until you make it something different. If that's not it, either the aperture in the lens is not working right or the camera is not metering properly. Even as low as ISO 100 you should still get at least 1/250 on a sunny day at f2.8...probably more like 1/3000 or higher. Right now under cloudy skies with my 135mm wide open at f2.8, ISO 200 my K-x sets the shutter speed at 1/2000. And the test shot looks very good. At ISO 100 it gets 1/1000 and looks almost exactly the same. ON a sunny day I'd be getting at least 1/3000 I'm pretty sure.
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