K20D Public Service Announcement

Johan Josefsson · Feb 22, 2008

Thanks for the the test shots!

You don't happen to have a lawnmower at hand so you could test if shake reduction is improved?

Or will we have to wait until Janneman gets his hands on one of these?

jeffkrol · Feb 22, 2008

Canon joins the "crowd"..... per dpreview:

Unlike the EOS 30D the EOS 40D proved to have the same (iso) sensitivity as indicated...

I'll have to check out to see if the forum-ites are complaining about "underexposure" for the 40D...........

Well, maybe not.

--
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'The exposure meter is calibrated to some clearly defined standards and the user needs to adjust his working method and his subject matter to these values. It does not help to suppose all kinds of assumptions that do not exist.'
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Laurens · Feb 22, 2008

Anyone know how the AF adjustment works with zooms? And what about 3rd party zooms (e.g. Sigma)? Is there a single setting for a zoom lens, or will it store the value on a focal length basis?

Laurens

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Roland Mabo · Feb 22, 2008

According to me, some Sigma lenses may get into trouble. I don't know, it must be tested first. I don't know if Sigma lenses stores their serial number in the lens chip.

I don't know how close Sigma lenses are to "real" Pentax lenses in terms of compatibility, there might be issues. I trust lenses from Tamron more since they pay for the lens mount, and Sigma are not.
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R
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Roland Mabo · Feb 22, 2008

There is no "internal database" in the camera, it is in external software (Pentax PhotoBrowser).
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R
http://www.flickr.com/photos/raphaelmabo

GordonBGood · Feb 22, 2008

cam_oai said:
if i send you a grainy pic, could you tell me what iso it was taken at?
(probably no, you can guess of course.no exif)

No, I already said that one wouldn't be able to determine ISO, especially with no EXIF. However, if you provided shutter speed and aperture that the image was shot, as well as a light meter reading off an identified texture in midtones of the image, then I could tell you the effective ISO at which it was shot to a reasonably close order.

GordonBGood

Anastigmat · Feb 22, 2008

Neither is low noise. It appears the K20D uses heavier noise reduction. The roofline of the building on the left side of the photo is visible in the K10D image but it is not in the K20D image.

So, more megapixels = less noise + less details at high ISO settings.

That is what one would expect from a small sensor with more and more pixels crammed into it and more noise reduction applied to keep noise down.

Joseph Tainter said:
K10D at ISO 1600:

K20D at ISO 1600:

To get exact equivalence between the images you need to enlarge the
K10D image to about 120% vs. 100% with the K20D image.

Richard Smals · Feb 22, 2008

Anastigmat said:
Neither is low noise. It appears the K20D uses heavier noise
reduction. The roofline of the building on the left side of the
photo is visible in the K10D image but it is not in the K20D image.

So, more megapixels = less noise + less details at high ISO settings.

That is what one would expect from a small sensor with more and more
pixels crammed into it and more noise reduction applied to keep noise
down.

I can see the roof line on both images! And i can see more detail with less noise in the K20D image. (I use a calibrated monitor)

For detail : look at the window shades near the entrance...your opinion please?

Did you read that there was No NR set on the K20D.

Honestly i know you want the logic to be: more pixels on same sensor size..so there must be more noise then on the K10D. But actually the samsung CMOS design is different then the Sony CCD design, so why could it not be equal or even better like it shows here.

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Richard Smals · Feb 22, 2008

I can read EXIT in the K20D image!

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http://www.indots.nl

I have the deepest respect for all those people who like me.

Alfisti · Feb 22, 2008

Really, you're both wasting time. No tripod means the focus point could be differen tand in that light camera shake is likely an issue.

Utter waste of time comparing sharpness.

***********************************************
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Updated January '08

Gary Martin · Feb 22, 2008

Alfisti said:
Really, you're both wasting time. No tripod means the focus point
could be differen tand in that light camera shake is likely an issue.

Utter waste of time comparing sharpness.

Must use a tripod to properly shoot at ISO3200 - am I the only one who finds that mildly humorous?

--
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Alfisti · Feb 23, 2008

In normal shooting of course not but if you're going to sit here picking apart the relative merits of one image over the other then you must remove the impact of camera shake and focus innaccuracy.

I can't beleive this is so hard to get one's head around.

Gary Martin said:
Gary Martin said:

Really, you're both wasting time. No tripod means the focus point
could be differen tand in that light camera shake is likely an issue.

Utter waste of time comparing sharpness.

Click to expand...

Must use a tripod to properly shoot at ISO3200 - am I the only one
who finds that mildly humorous?

--
http://www.pixelstatic.com

--
***********************************************
Please visit my gallery at http://www.pbase.com/alfisti

Pentax Lens examples at http://www.pbase.com/alfisti/images_by_lens

Updated January '08

Jonathan Demarais · Feb 23, 2008

--I'm surprised you could focus under those conditions given the terrible focusing sensitivity of the K10/20 under low light. Also, the exposures for the two 1600 ISO images seem to be different, the K10D image shows more illumination, also note the extra chromatic aberration around the lights which indicates a greater exposure or that the K10D is more sensitive than the K20D. Lastly, the fencing (on the left)seems somewhat sharper in the K10D image, which is something I've seen in other comparisons. Sharpness does not always = more resolution, however.

'I cried because I had no E-3. Then I met a man with no E-510'

cbusi · Feb 23, 2008

They can't do that. Just take a picture at ISO 800 and then at ISO 1600 The Exposure will have to be different....like maybe 1 stop of either shutter speed or f/stop. Anyone that is using a higher ISO would know this right away. The reason why they are setting a higher ISO is to speed up the shutter speed or close down the lens a stop. if that wasn't happening then higher ISO would be useless and there would be no reason to have it.

....I think?

gazonk · Feb 23, 2008

Jonathan Demarais said:
--I'm surprised you could focus under those conditions given the
terrible focusing sensitivity of the K10/20 under low light.

Did you forget a ;-) here?

Jonathan Demarais said:
Also, the exposures for the two 1600 ISO images seem to be different, the
K10D image shows more illumination, also note the extra chromatic
aberration around the lights which indicates a greater exposure or
that the K10D is more sensitive than the K20D.

Yes, I noticed that too!

Jonathan Demarais said:
Lastly, the fencing
(on the left)seems somewhat sharper in the K10D image,

I think it just looks so because the fencing is brighter (because of the exposure).
--
Espen

jimstonefreelance · Apr 5, 2008

Can you post the images full frame, so I have more to work with? You posted them at half frame, it will be much easier to clean up a full frame image. Thanks.

These images were cleaned up only with Photoshop Elements, which is NOT ideal!

K20D at 3200

K20D at 6400

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K20D Public Service Announcement

Johan Josefsson

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Laurens

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Roland Mabo

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Anastigmat

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Richard Smals

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