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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Camera light metering. (1 Viewer)

u9jzp6

Well-known member
Hi,

I have a new Pentax K-x and the light meter seems to be calibrated differently than my previous camera.

I had been using a super zoom point and shoot (cannon sx20 is) and at 0 exposure compensation the pictures were sometimes a bit dark, but the histogram was centered. (I check this by pointing the camera at a blank wall so the histogram is a narrow peak). I assumed the light meter conventions tried to prevent over-exposure and I should brighten the images in an image editor.

The Pentax K-x with 0 exposure compensation gives very dark images and the histogram is shifted to the left. I have to use exposure compensation of +1 1/3 to get the histogram centered and then the photos have the same brightness (when viewed on my computer monitor) as photos from my other camera when it is set to 0 exposure compensation.

I am wondering if this is a characteristic of DSLR's in general, Pentax SLR's specifically or is my camera defective? Shouldn't the histogram of a uniformly lit wall be centered when the exposure compensation is set to 0?

Thanks
 
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