* My K20D vs. K10D experiments - ISO test series etc.

Started Mar 2, 2008 | Discussions
Ari Aikomus
Ari Aikomus Veteran Member • Posts: 9,339
* My K20D vs. K10D experiments - ISO test series etc.

Hi,

Of course I had to make some tests&comparison series (as usual ;-)) like "my new camera vs. old camera" things, sorry for that - BUT here we comes!

I made several series (ISO 100,400,800,1600,3200,6400, jpg vs.raw, shadow noise and pumping up underexposed images), but this first post is ISO100 & 400 test, enjoy:

...next series will be ISO 800&1600 comparison.

Ari

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Ari Aikomus
OP Ari Aikomus Veteran Member • Posts: 9,339
* NOTE - all shots tungsten WB & K20D files resized to match K10D res. n/t
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Brad99 Veteran Member • Posts: 3,145
Re: * My K20D vs. K10D experiments - ISO test series etc.

The higher K20D resolution is rather good at getting rid of moiré effects.

wll Veteran Member • Posts: 4,821
Re: * My K20D vs. K10D experiments - ISO test series etc.

it looks like the K20D sensor is a big winner. It will be interesting to look at the comparison of the 800,1600 ... and see how the K20D 3200 compares to the K10D 800 or 1600 ?

wll
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ichiboy Junior Member • Posts: 49
Re: * My K20D vs. K10D experiments - ISO test series etc.

I think the another story here is how much sharper the K20D looks, can that be entirely attributed to noise? I think even if the K20D image had more noise it would still look about that sharp. I know that you were probably on a tripod so it probably doesn't have to do w/ SR, but I wonder why those images look so much sharper.

DrugaRunda Senior Member • Posts: 2,741
Re: * My K20D vs. K10D experiments - ISO test series etc.

K20D sorted out the "unsharp jpegs" from Phils test...
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Ari Aikomus
OP Ari Aikomus Veteran Member • Posts: 9,339
*PART#2* ISO 800 & 1600 test series

There are some WB/colours/brightness differences (this isn't scientific test - although personally I trust in my results pretty much).
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etagimbo Senior Member • Posts: 1,121
Re: *PART#2* ISO 800 & 1600 test series

Wow. Fantastic improvement.

Ari Aikomus
OP Ari Aikomus Veteran Member • Posts: 9,339
Re: * My K20D vs. K10D experiments - ISO test series etc.

Hi and thank you for reply,

ichiboy wrote:

I think the another story here is how much sharper the K20D looks,

yep - it's another story, because this was more ISO, noise and shadow noise test than sharpness comparison - however of course you can make some conclusions about how much increased resolution affect in pictures. But remember that I resized/downsized K20D pics to match better with K10D crops in this test series! So actual resolution differences can be even a bit more.

can that be entirely attributed to noise?

No, I think (at least in Low ISO samples). But I used aperture f/8 in every shots and I thought it's enough to compensate some focus errors - I'm not sure why K10D images look softer, but next post include K10D raw conversions and these are a little bit sharper than .jpg files.

I think even if the K20D

image had more noise it would still look about that sharp. I know
that you were probably on a tripod so it probably doesn't have to do
w/ SR,

yep - tripod (2sec MLU) without SR.

Ari

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dmoore Regular Member • Posts: 141
can you do a RAW ISO 3200 from the K20D

pretty please.

also I wonder if spot metered custom WB would have gotten colours closer?

Ari Aikomus
OP Ari Aikomus Veteran Member • Posts: 9,339
Re: can you do a RAW ISO 3200 from the K20D

Hi,

dmoore wrote:

pretty please.

Yes - actually I have already done it...follow my next posts

also I wonder if spot metered custom WB would have gotten colours
closer?

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DLBlack Forum Pro • Posts: 13,276
Re: can you do a RAW ISO 3200 from the K20D

Thanks for conducting these tests. To my eyes the K20D images looks like a real improvement over the K10D images.

Dave

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Ari Aikomus
OP Ari Aikomus Veteran Member • Posts: 9,339
*PART#3* ISO 800 & RAW test series

I processed K10D PEF files with ACR 4.3 and K20D DNG files with Pentax Photo Laboratory3. No extra PP, except some WB adjustments.

Next post: ISO 3200&6400 series...
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Frederick Stewart Senior Member • Posts: 1,125
Re: can you do a RAW ISO 3200 from the K20D

Thanks for these test,showing in my opinion that this sensor is perhaps best in class.i can see further improvements when the pro cam hits the stage.

Cheers !

SteveNunez
SteveNunez Contributing Member • Posts: 778
Re: can you do a RAW ISO 3200 from the K20D

No question which is the better camera- I think this has been proven many times already.
But, considering the K10D is 1/2 the cost, is the K20D 2X the camera?
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Frederick Stewart Senior Member • Posts: 1,125
Re: *PART#3* ISO 800 & RAW test series

Well to my eyes the K20Ds out of camera jpegs looks mighty fine,as good as the Raw. I am anxious to hear what some very picky reviewers have to say. ?

Cheers !

etagimbo Senior Member • Posts: 1,121
Re: can you do a RAW ISO 3200 from the K20D

SteveNunez wrote:

No question which is the better camera- I think this has been proven
many times already.
But, considering the K10D is 1/2 the cost, is the K20D 2X the camera?

When you compare the prices you have to compare their prices when both came out. If they would not want to clear the warehouse of the last K10D's because of the K20d you would not get it this cheap.

etagimbo Senior Member • Posts: 1,121
Re: *PART#3* ISO 800 & RAW test series

It's also nice that the noise has a different quality. Gone are the big color blotches of the K10d which are so hard to get rid of with noise reduction.

Frederick Stewart Senior Member • Posts: 1,125
Re: can you do a RAW ISO 3200 from the K20D

The K20D in a few weeks,my opinion, will be best value for the bucks when all things put together. prices are already coming down.

Cheers !

pcarfan Veteran Member • Posts: 3,917
Fabulous

Thanks for posting this...I think your last RAW comparision is more valid (the chroma noise you see with the JPEG was never seen by me shooting with RAW even at 1600). The resolution is a stunning improvement and the ISO is improved as well.

Would be interesting to see the RAW converted comaprsions for 1600 and then a 3200 K20D as well to comapre that to the K10D 1600.

If time permits I would love to see RAW comaprsions for ISO 100 as well, and the rest (200, 400)
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