K-x vs K-7, without K-7 ISO cheating

Started Nov 19, 2009 | Discussions thread
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godfrog Senior Member • Posts: 1,463
K-x vs K-7, without K-7 ISO cheating

As many have pointed out, comparison sites are consistently showing that the K-7 needs more light at a given ISO to give a proper exposure.

For this reason, comparisons at the same ISO arnt very meaningful, when two cameras are going to need different ISO for a given lens/scene/aperture/shutter.

This was shown once again when Imaging Resource recently uploaded their K-x comparison shots. With the same scene, light, lens and aperture, the K-7 shots have twice as long shutter speed compared to the K-x!

K7 - ISO3200 - F8 1/250
K-x - ISO3200 - F8 1/500

As any real situation has the same shutter speed and aperture requirement between the two cameras, I made a comparison where the two cameras get the same amount of light to work with. Same scene, light, aperture and shutter, but ISO1600 on the K-x and ISO3200 on the K-7. Developed from DNG RAW with all default settings in Lightroom. K-x to the left.

(edit: at base ISO both cameras have plenty of detail in these areas, so this is not a focus issue)

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wll
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