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12-30-2011, 02:07 PM   #1
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K-7 D-Range Setting

I went back to my manual to re read the options the K-7 has to offer had the camera for 2 years just love it. I couldn't get the ISO down to 100 Found I had D=Range set to ON for some time. What does this acturally do? The manual doesn't explain it nor does the Magic Lantern Guide do much. Is it something like TOY Setting? I have never found a use for this exposure.

12-30-2011, 04:12 PM   #2
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What it does is preserve the highlights at the expense of one stop. So you lose ISO 100 and get minimum 200 ISO with the camera making sure to preserve highlight detail. I used this setting for about 6 months, but found that since I shoot RAW, and can recover the highlights the majority of the time in LR, that I don't really need the setting. There is noise present in dim lighting at both ISO 100 and 200, so now I only turn this setting on when I am worried about the highlights specifically and don't feel I can compensate for them correctly. It's been a few months since I made that decision and I wouldn't recommend leaving it on by default.

[edit]
I suppose if you shoot only in JPEG, and have a tendency to blow the highlights frequently, then you might want to leave it on all of the time.

Last edited by HEEGZ; 12-30-2011 at 04:14 PM. Reason: counter point
12-31-2011, 06:59 AM   #3
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Thanks, I think I had forgotton that I had turned it on a while ago. Great explination re the highlights. The manuals seem to skip over this feature as if we should know what the D Range is. Thanks and Happy New Year
12-31-2011, 08:17 AM   #4
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From what i read and understand about it.
You can actually see it that the camera underexpose the photo and with software up the exposure to the correct level.

So if you shoot at ISO200 the shot is actually taken at ISO100 and by software the exposure is upped with 1 stop without clipping the highlights.

That's why with the K5 that can go down to ISO80, ISO160 is the limit.


If you shoot in RAW there is nothing to gain with this feature.

12-31-2011, 08:51 AM   #5
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QuoteOriginally posted by Anvh Quote
From what i read and understand about it.
You can actually see it that the camera underexpose the photo and with software up the exposure to the correct level.
Is it that simple? I though it does a non-linear exposure where the dark areas are exposed at 200 ISO and the highlights at 100 and then pushed to 200. I know it changes the RAW data.

Anyone has more technical info on the actual type of algorithm used?
12-31-2011, 01:55 PM   #6
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01-01-2012, 06:45 AM   #7
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QuoteOriginally posted by demp10 Quote
Is it that simple? I though it does a non-linear exposure where the dark areas are exposed at 200 ISO and the highlights at 100 and then pushed to 200. I know it changes the RAW data.

Anyone has more technical info on the actual type of algorithm used?
Like you said it's probably a curve thing, believe i said something along those lines in the sentance under the one you quote
i don't have more information about it sadly.

Will do a test when i've some time with the K5 to see if i can recreate ISO200 DR extended photo with a normal ISO100 photo pushed.


Little bit more info.
https://www.pentaxforums.com/forums/pentax-dslr-discussion/22265-what-differe...tml#post191281

Last edited by Anvh; 01-01-2012 at 06:51 AM.
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