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Pentax K20D Gordon Laing, May 2008

Pentax K20D results : Outdoor resolution / Studio resolution / Real life Noise

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Canon EOS 450D / XSi

Outdoor resolution - Pentax K20D vs Sony Alpha A350 vs Canon EOS 450D / XSi

 
To compare real-life performance we shot the same scene with the Pentax K20D, Sony Alpha DSLR-A350 and Canon EOS 450D / XSi within a few moments of each other using their best quality JPEG settings, 100 ISO sensitivities and default processing options. The K20D was set to its default Bright Custom Image option.

In the absence of the new Mark II 18-55mm budget lens, we tested the K20D with the DA 18-250mm. The Sony and Canon bodies were tested with their respective kit lenses, the DT 18-70mm and EF-S 18-55mm IS. All lenses were set to f8 and adjusted to deliver the same field of view.
 

The image above was taken with the Pentax K20D at a sensitivity of 100 ISO, using the DA 18-250mm lens at 25mm f8; the original **** JPEG file measured 11.4MB. All crops are presented at 100% and the Canon samples show a slightly larger area due to its slightly lower resolution. These images were taken during the same session as those from our Sony Alpha A300 review, so if you'd like to compare them against a 10 Megapixel model, check out our Sony Alpha DSLR A300 results page.

We criticised the earlier K10D for producing somewhat subdued images using the default settings, but there's no such problem here. Indeed Pentax has possibly gone slightly too far in the other direction with the K20D's default Bright mode: the output seen here and in our Sample Images page is certainly vibrant and consumer friendly. Enthusiasts or those who like to post process their images will almost certainly want to tone down the contrast, saturation and sharpening, and thankfully the K20D gives you a wealth of control over this. But anyone looking for punchy, consumer-friendly images straight out the camera will be delighted with the K20D.

We've pictured the K20D samples below alongside those from the Sony Alpha A350. Both are 14 Megapixel cameras, but employ different sensors and sensor technology. The biggest differences seen below though are due to their respective image processing and the lenses used to test them. As illustrated in our Sony A300 review, the higher-end A350 has outgrown the DT 18-70mm kit lens and if you fit this optic, you won't see any benefit over a 10 Megapixel model. Our copy of this lens used for testing the A300 and A350 was also soft in the top left corner which is most noticeable in the mountain ridge crop.

To be fair, the first lens we tested with the K20D also had problems: in the absence of the new 18-55mm II kit lens, we temporarily tried the original Mark I version, but quickly abandoned it due to very disappointing results. So for our K20D results and sample images we've used the DA 18-250mm lens, which despite its super-zoom range, actually performs very well across the frame at the test focal length.

In the areas of the image where both lenses are performing without issues, the K20D and Sony A350 deliver roughly the same degree of real-life detail, with the Pentax looking more punchy due to its default image processing. Are either camera resolving noticeably more than the 12 Megapixel Canon 450D / XSi though? Judging from the third column of crops we'd say there's little in it here, although as you'll see, differences can be measured in studio conditions.

To find out how the K20D performs in RAW, scroll to the bottom of this page. If you can't wait to see actual resolution scores though, head straight over to our K20D Studio Resolution page.



Pentax K20D
with Pentax DA 18-250mm
Sony Alpha DSLR-A350
with Sony DT 18-70mm
Canon EOS 450D / XSi
with Canon EF-S 18-55mm IS

Pentax K20D - crop 1   Sony Alpha DSLR-A350 - crop 1   Canon EOS 450D / XSi - crop 1
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO
         
Pentax K20D - crop 2   Sony Alpha DSLR-A350 - crop 2   Canon EOS 450D / XSi - crop 2
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO
         
Pentax K20D - crop 3   Sony Alpha DSLR-A350 - crop 3   Canon EOS 450D / XSi - crop 3
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO
         
Pentax K20D - crop 4   Sony Alpha DSLR-A350 - crop 4   Canon EOS 450D / XSi - crop 4
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO



Pentax K20D: JPEG versus RAW


We photographed the scene here in the K20D's **** JPEG + RAW mode and presented crops below from each file for comparison. The RAW file was recorded in the DNG format and converted using Adobe Camera RAW using the default settings, before being sent to Photoshop in 16 bits. This was then reduced to 8 bits and processed the same way as the original JPEG for presentation here.

The JPEG file, processed using the camera's default Bright settings, is clearly much punchier than the processed RAW file - everything's been turned up a notch or two for consumer-friendly output. In contrast, the RAW file appears relatively drab, although it's lacking the artefacts of the JPEG file which has arguably been pushed a little too far. Something in-between the two could strike a happy medium, and of course the benefit of shooting in RAW is the latitude for adjustments. Indeed our RAW file here contained a measurably greater tonal range than the JPEG, especially in the shadow areas. Due to the way the K20D metered though, there wasn't anything lost in the highlight areas of either file. Now let's look at the K20D's studio resolution.

Pentax K20D JPEG
with Pentax DA 18-250mm
 
Pentax K20D RAW
with Pentax DA 18-250mm
f8, 100 ISO
f8, 100 ISO


Pentax K20D results continued...

Outdoor resolution / Studio resolution / Real life Noise


All words, images, videos and layout, copyright 2005-2014 Gordon Laing. May not be used without permission.

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