LR & PEF RAW files

I've been working with LR since vs. 1. No matter which version I use, when I upload PEF (from various Pentax camera models), I always see "brightness 50; blacks 5; and contrast 25". Every image gets the same value. I've started loading with "zeroed" and inputting my own consistent preferences before going through to check them manually. I prefer exposure changes first, based on the histogram. So, is their a "right" or "wrong" way to load them for a class expecting you to shoot in RAW, load in lightroom and produce pdf contact sheets in the print module with little to no basic editing. I cannot even tell which one gives the same histogram that I see in my camera. If we are shooting according to histogram parameters in a RAW format, what method gives us a "straight out of camera" comparison??? This has been very frustrating for me!
Thank you.

The brightness 50, blacks 5, and contrast 25 are LR defaults for raw files.  There's also a slight foot on the curves, a noise reduction default setting and a sharpening default setting.  These are just starting points.  You can of course set up a preset to be applied on import but that really benefits those that shoot in highly controlled and consistent lighting situations.   I don't think there is a wrong way since it's really personal taste and getting the shot to where you want it.
But for your class if they expect completely unadjusted raw images I think the Lr default settings would be fine to create a contact sheet for class discussions. And I would avoid making any adjustments since it seems to be a learning exercise about using histograms while shooting.  Making adjustments would skew your results.  Hopefully everyone in your class uses the Lr defaults and the same raw profile (acr 4.4 or adobe standard) then you'll get a leveled playing field. 
What was the assignment? 
Trying to match the Lr histogram to your camera histogram is another issue.  The color space you are working in affects your histogram.  LR works in Adobe ProPhoto RGB which is what the histogram is based upon and it has a different tonal response curve than what your cameras histogram is based on.  Your cameras histogram is based on an internally processed version of the raw data (like if you shot to jpg) and it's tone response curve is based on the color space and develop settings your camera applies to a jpg (rgb, srgb, contrast +2, saturation +5, etc..).  If you shoot raw + jpg the jpg will have a histagram that more closely matches what you saw on your cameras lcd. 
Here's a link to another discussion just on variances between camera histograms and LR histograms.
Adobe Forums: Histogram inconsistencies with Camera...

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