K-5 Live View Histogram

A quick question, sorry if its been asked before.

Does the histogram update when using Live View with the K-5 in manual mode?

I noticed that when selected to Live View and on manual control, adjusting either aperture or shutter speed did not affect the Histogram. I would have expected the graph to move depending on aperture/shutter settings.

Hope this makes sense. Thank you.

The small LV histogram does not update to reflect exposure control adjustments. It responds to actual changes in lighting levels, not your exposure settings on the camera (not ISO either). These exposure adjustments are only effective when the shot is taken - then your histogram will show the readings for the actual shot ... bear in mind this is for the Camera JPEG (as processed), not the RAW.

Thank you. Not really sure of the point in displaying it. Seems to be of limited use.

I know exactly what you mean, I've an X100s where it does update in live view and is really useful when trying to either underexpose or overexpose in camera and see the result.

Used it loads of times in some low light portrait, nude. glamour work

The LV histogram is a guide to the ambient lighting dynamic range spread around the meters measurement of a grey midtone. This is not the same thing as a photos exposure value (EV), which is controlled by the user. By assessing the dynamic range in a scene you come to decide where to pitch the actual photos midtone - either by exposure compensation or manual mode ... In making such a judgement you also re-pitch the whole spread of brightness values, so the judgment is also about what to prioritise (eg shadows, highlights).

So the LV histogram is the guide to the Dr spread in a scene to help make our own exposure value judgement. After taking a shot we can reassess the result based on the graph of our actual photo, which may not be the same as the ambient light levels.