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Old Jan 30, 2008, 9:56 PM   #1
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http://www.apcmag.com/7922/pentax_ad...r_latest_dslrs

What until recently was a multi-step process, which required taking multiple exposures, combining them in specialised software, and then tone mapping the final image, can now be performed in-camera.

The Pentax K20D and the Pentax K200D both use a new metering system which allows their CMOS sensors to take simultaneous readings of both highlight and shadow areas.

The user then simply needs to access the camera's HDR mode through the menu dial, set the camera up for the first shot, press the shutter, and off it goes. The internal sensors will then take three shots and combine them into a single HDR image.
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Old Jan 31, 2008, 1:36 PM   #2
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Sounds pretty good, but I was not aware the K200D used a CMOS sensor. Am I missing something here? If this is all true, I'm sure it will be covered in the reviews as the camera's come out. This could be pretty big news for some photographers. I have played with HDR and it is a pretty involved process and best done with a tripod- Bruce

PS - They do mention an Expanded Dynamic Range function in the details of the cameras, but don't go into detail.
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Old Feb 1, 2008, 9:40 PM   #3
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I can't speak for the K200D as I have no interest in it. However, I have seen nothing in any of the new feature/enhancement lists that indicates this "HDR" capability in the K20D. It is possible I missed it but I have read everything I can find and so far the link provided has been the only place I have seen this mentioned.

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Old Feb 2, 2008, 12:32 AM   #4
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Robert Barnett wrote:
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I can't speak for the K200D as I have no interest in it. However, I have seen nothing in any of the new feature/enhancement lists that indicates this "HDR" capability in the K20D. It is possible I missed it but I have read everything I can find and so far the link provided has been the only place I have seen this mentioned.
Hi Robert,

I won't dispute your not finding anything in official specs, but some of the earliest samples put up on the web were from the Dubai press conference that was a few days previous to the official announcement, and a few illustrated the HDR function. I didn't really follow this, but if memory serves, the in-camera HDR actually uses some algorithm to vary the sensitivity if individual (or groups of) pixels to increase the dynamic range of the image taken. The "darkest" photosites ISO is boosted and the on the "brightest" ones sensed, the ISO is lowered. The K20D defaults to at least ISO 200 since it would need some headroom on the slower side. The downside is that there is increased noise in the shadow areas because higher sensitivity is used there.

Here's a DPR post that has some shots from a Dubai attendee that is supposed to illustrate the feature. I'll wait to use it myself to judge how well and how indeed it works, but I'm pretty sure that it's included in the feature set.

http://forums.dpreview.com/forums/re...ssage=26494170

This is obviously different than bracketing and combining the shots in camera, so isn't the same as in the quoted article. My experience with multiple shot HDR processing in PP is that it takes pretty long in on a desktop computer (granted, not a very fast one by today's standards), and I'd have my doubts that this can really be practical with the processing power provided in-camera. The K20D does have an apparently good one touch bracketing mode, so multi-shot HDR will probably be easier to actually accomplish, but I'm willing to bet that multi-shot is not how the in-camera HDR mode will work.

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Old Feb 2, 2008, 10:15 AM   #5
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Thanks for the info. I wasn't really concerned about how it works or how good it was, I was just curious becuase I didn't see anything mentions in the list of new features and enhancements. Maybe like Adobe's first implmentation of HDR in Photoshop it was experiemental and so Pentax didn't put a spotlight on it. It will however be interesting to play with.

Personally, I don't like HDR as the images always either look bad or when they look ok they look like paintings.

Robert
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Old Feb 2, 2008, 4:05 PM   #6
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hi,
I have the green lantern book on the k10d and just stubled onto this. It appears,
( I think ) that it may have this capability also. In the menus on page 2 it is multi exposure - select the number of exposures. Then you check the next box. It suposedly does the rest for you. On monday I will have acess to a scanner, and I'll scan that page and try to attach it. I was actually looking hear for more info on it because when I tried it I only heard one shutter click. That makes me think that the camera maybe processing multiple jpgs, then combining them for the 1 pic you get on the card. If that is true than the latitude would probably only be a few stops, not as great as actually combining say 5 shots at 1.5 stops each. one more thing, so far I don't see those sureal colors that you get with either photoshop or photomatrix after tone mapping. Anyone have more info on this I would love to know.
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Old Feb 2, 2008, 4:23 PM   #7
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Hi Bob,

I've only played with this briefly, but AFAIK, you can't bracket exposures (it's disabled) in Multi-Exposure mode so I don't think you can use this for HDR.

Other than the obvious use to get multiple perspectives of a moving subject against a fixed background, M-E mode can significantly increase your effective shutter time for "soft" moving water effects without relying on overcast days or having to use a neutral density filter. With Ev compensation turned on, it seems to be a pretty easy way to get the effect, even in relatively brightly lit scenes.

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Old Feb 4, 2008, 3:40 PM   #8
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I am not sure I am using this right but I tried it in Manual - set for 3 exposures, on a tripod. then just changed the lenght of the exposure. after 3 it combined them into a shot that seemed to have beter dynamic range. However as i did this test indoors in soft light, and since it does not save the 3 shots just the one combined, I am not so sure it is similar to HDR, it might have just been a slightly over exposed shot that seemed to reveal more shadow detail... Hmmm don't know.
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Old Feb 4, 2008, 4:11 PM   #9
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I am pretty sure the multi-exposure in the K10D is not HDR. It is simply doing multiple exposures. For example in the old film days you could shoot a picture of a person up close, do not advance the film and then move back and photograph them again full body off to the side. It is what I would call a double exposure except that the K10D allows you to do more than 2 shots.

Doing it like you suggested with a non-moving subject on a tripod would be like loading the same image to in to Photoshop and creating several layers of it and then adding them together if photoshop had an add layer blending mode.

I don't think this expands the dynamic range and is therefore not HDR.

Robert
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Old Feb 5, 2008, 8:21 AM   #10
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robert--

That make a lot of sense. You should work at Pentax to help with these very poorly written manuals. I would say i now have a better understanding of the feature.

has anyone posted some shots using this feature.???



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