Category Archives: Light

Light Play

Pentax K-5 and an Exposure “Oops”

We’ve all done it you know, when you snap a shot and haven’t checked your exposure, when the result you get is just a black image. Well, with the K-5, this isn’t necessarily a lost shot. In fact, the result can be quite interesting!

DxOMark just published their review of the Pentax k-5 sensor. The outcome of their tests placed the Sensor in a three way tie for fourth place with only medium format and full frame sensors ahead of it. The outcome was so good that DxOMark made this statement: “No need for suspense: this new 16.3 MP sensor is simply the best APS-C we have tested so far, sometimes able to compete even with very high-end full-frame cameras.” In particular, this applies to dynamic range and that is the crux of my post because dynamic range, which the K-5 is currently holding title as the best in the world, is how you can sometimes recover the “oops” I mentioned.

So, here’s the RAW image with ACR defaults (shot at f/4.5, ISO 80, and 1/200s shutter):

Now, this is with:

Exposure: +4.00

Recovery: 0

Fill Light: 0

Blacks: 5

Exposure: +4.00

Recovery: 0

Fill Light: 0

Blacks: 0

Exposure: +4.00

Recovery: 0

Fill Light: 100

Blacks: 0

Now with some noise reduction and sharpening:

Obviously I could do some more with the image, since it has been recovered, but I think the outcome speaks for itself. Other shots I took today in the same light were ISO 16000. This was ISO 80, meaning the exposure was almost 8 full stops off of what it should have been. That, folks, is wicked dynamic range.

Playing Around

Various different shots of things, mostly macro. Updated with some experiments using multicoloured gels on smoke. Updated again with some water on nail action. Updated again with water on CDs.