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12-07-2010, 11:10 PM   #1
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k-5 and k-r ISO noise higher than 3200?

How is the ISO noise of the k-5 / k-r with ISO 3200 or greater. I want to hear your opinions, because I am currently thinking if I will switch from K-7. Is it worth it? If you can post some pictures unedited, that would be much appreciated.

12-08-2010, 12:01 AM   #2
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K-5 comparison

try to compare K-5 with K-x and K-7 on

I am trying to avoid ISO above 800
12-08-2010, 12:39 AM   #3
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The ISO 25600 and 51200 settings are marketing hype. Useful sensitivity with the K-5 ends somewhere around 3200. Compared to the K-7 or K20D too for that matter you will have the feeling that you have gained one extra step, not very much more. If the last cutting edge is important to you, you might find it worth the money, otherwise not.
12-08-2010, 12:52 AM   #4
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on the samples Ive pored over on image resources, Id have to say that the K5 is a possible 2 stop faster than the K7 with a equal noise ratio

...I find that the K7 is not too good at anything above ISO 800, while Id say the K5 would stretch to 3200 with comparable noise .these are for shots with mimimal PP work...I can go to 6400 on the K7 and have Topaz denosie plug in for photo shop do the rest..but quite a lot of detail is lost , but it still usable if the exposure was correct..

the AF is supposedly better on the K5 as is the Dynamic range....

at Low ISO the K7 is on par with the K5...

check out image resource and compare the K7 and K5 together side by side.

12-08-2010, 02:17 AM   #5
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Yes the AF is better – more precise. The AF point selection is improved a little too. The number of AF points is still too small.
12-08-2010, 05:28 AM   #6
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QuoteOriginally posted by metungnasi Quote
How is the ISO noise of the k-5 / k-r with ISO 3200 or greater. I want to hear your opinions, because I am currently thinking if I will switch from K-7. Is it worth it? If you can post some pictures unedited, that would be much appreciated.
On the K-5 ISO3200 with no noise reduction looks acceptable for me, with some light noise reduction it's good. Therefore at the moment I'm using the ISO80 - 3200 range. When my raw developer app finally supports K-5 I will check how ISO6400 pics look with some NR, but based on a few out of cam jpg with medium NR I think it might be usable for smaller prints or for web (downsized to less than 3MP).

At the moment I only have a lame pic (that I used for selling my K-m) at hand: ISO3200, JPG out of the cam with NR OFF. I'm sure you can find better and more interesting ISO3200 shots on the net
12-08-2010, 06:08 AM   #7
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QuoteOriginally posted by metungnasi Quote
How is the ISO noise of the k-5 / k-r with ISO 3200 or greater. I want to hear your opinions, because I am currently thinking if I will switch from K-7. Is it worth it? If you can post some pictures unedited, that would be much appreciated.
Based on my evaluations the K-5 can be persuaded to produce ISO3200 images that are indistinguishable and 'nearly indistinguishable' from an ISO200 one. With this in mind, let me explain why I used these two conditions.

Indistinguishable: can be achieved by shooting to bypass low level NR(system NR). Which is done by limiting your sensitivity to ISO1600 and relying on RAW processing to push process exposures(sensitivity) afterward. And I know this sounds somewhat bizarre or troublesome, but as my good man dgaies has expressed its easier to do than it sounds.

Nearly Indistinguishable: is where you shoot everything as per, and work with the NR image. However, I want to stress that the differences between the two are very minute and it that without some form of contrasting image to compare with, there would be no way to identify any loss in detail etc.

And so I'd recommend shooting to bypassing NR for the purists who want to get every single ounce of IQ from their K-5(studio grade output etc). Otherwise, please ignore what I just wrote and accept that the K-5 can and does produce amazing ISO3200 output. As for the remainder of the sensitivity spectrum, I'd say the K-5 has an unprecedented capacity to shoot up to a usable ISO12800. Granted it doesn't fall in the indistinguishable or nearly indistinguishable, but it would have no problems fitting in the more than usable classification of things.

Also, for what it's worth, I think the K-5 is worth every bit it's value as an upgrade to a K-7.
12-08-2010, 07:28 AM   #8
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A quick and dirty test

...shows that JohnBees method outlined above works. Left to right 100 % crops from the K-5 at ISO5000 - no exposure compensation, ISO1250 pushed two stops and noise aggressively controlled in ACR, last ISO 200 normally exposed (flash) modest noise control and sharpening.
But the same might apply to other camera models too. Don't have the time to test it right now.
PS it's not quite 100% on screen since PF reduces size upon upload. About 70 % I would say.

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12-08-2010, 01:33 PM - 1 Like   #9
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Unedited jpg

Straight out of camera, left K-5 at 3200, right K-7 at 1000. No sharpening, no noise reduction on either. Looks about the same = > the difference is less than 2 stops.
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12-10-2010, 07:29 PM   #10
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metungnasi, you owe Kameraten some Rep!!!
12-10-2010, 08:23 PM   #11
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here's a shot inside a bar at 12800 ISO (1/200, f/1.4). It's definitely noisy, but I still like the look of it.

(yeah, I could have gone with a longer shutter speed and bumped the ISO down, but I was trying to move quickly and be stealthy)
12-10-2010, 08:41 PM   #12
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Here is the K-5 next to the K-7, 100% crops at each ISO:
Pentax K-5 Outdoor Crops | Neocamera

You'll notice the K-5 shows some very nice improvements as ISO gets higher.

- Itai
12-11-2010, 01:26 AM   #13
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QuoteOriginally posted by extravagrant Quote
here's a shot inside a bar at 12800 ISO (1/200, f/1.4)
Yuip, that's nice. I do think the the K-7 would deliver about the same in this size at ISO 3200-5000 which corresponds to 1,7-2 stops difference. In this situation the small difference makes all the difference because that means the K-7 would have to be at 1/50 to 1/80 seconds, which would be too slow to stop the movement.
12-11-2010, 06:16 AM   #14
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QuoteOriginally posted by Itai Quote
Here is the K-5 next to the K-7, 100% crops at each ISO:
Pentax K-5 Outdoor Crops | Neocamera

You'll notice the K-5 shows some very nice improvements as ISO gets higher.

- Itai
Great comparison!
12-11-2010, 11:57 AM   #15
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QuoteOriginally posted by Kameraten Quote
Yuip, that's nice. I do think the the K-7 would deliver about the same in this size at ISO 3200-5000 which corresponds to 1,7-2 stops difference. In this situation the small difference makes all the difference because that means the K-7 would have to be at 1/50 to 1/80 seconds, which would be too slow to stop the movement.
Beyond that tho... the arguably greater advantage for most of us is the chroma noise. Very little to be had on the K-5 as we get higher until the highest levels. That Neocamera site really highlights that.
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