Originally posted by VoiceOfReason I think the K5 uses 3+ for it.
There are actually two varieties of HDR. One is in my opinion the 'real' HDR and that actually shoots thee photos. The other is just a simulated HDR whereby the image is processed just like you would do manually in LR or similar, increasing the shadows brightness and spreading the bright end of the histogram.
The K-30 does the 'real' variety, shooting three pictures, one at the set exposure, one at up to three stops slower and one up to three stops faster (it is the speed that is changed between pictures, not aperture or ISO). The HDR option is disabled in RAW, but that is really no issue as you can use bracketing instead and then combine in PP.
I think I saw in the 'custom image', 'digital filters' or somewhere like that what is effectively the simulated HDR, or maybe it was in some other camera. I tried check now but both custom image and digital filter options are greyed. Not sure why but possibly because they are not applicable in raw.
The 'real' HDR can give far more effective results than the simulated one, although the latter (especially if done in PP) can also give some respectable results. The reason is that the real HDR actually adds 6 real stops of dynamic range whereas the simulated one is just changing the tone curve to bring out more detail in the shadows and the highlights while compressing the mid-tones.