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Thursday, June 30, 2011

Real World Performance of the Sony Sensor Used in the Pentax Q II

ISO measurbation for the Sony Cybershot WX5:-
http://www.trustedreviews.com/Sony-Cyber-shot-WX5_Digital-Camera_review_test-shots-iso-performance_Page-5

I think the results are something that we should trust. Not because the website is called Trusted Reviews, but only that the pictures speak for themselves! ;-)

So, as the reviewer has commented, at ISO 400, noise starts to jump in, at 800, things go downhill and at 1600, the picture is just "unusable", IMHO:-


(ISO 1600, Sony WX5 w/ 12MP Exmor R BSI 1/2.3" CMOS Sensor)

Read on the Last Part.
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dave9t5's avatar

dave9t5 · 716 weeks ago

The ISO comparison images in the Trusted Reviews articles have almost zero detail in them, so they only show how noise increase with increaseing ISO, not how detail is retained (or not). Since we all know that there is a trade-off between noise-suppression and detail, it just leaves more question marks.

Another set of WX-5 images here: http://www.ephotozine.com/article/sony-cybershot-...
Full-Size images at ISO 125, 200, 400, 800, 1600, 3200, respectively: http://www.ephotozine.com/articles/sony-cybershot... http://www.ephotozine.com/articles/sony-cybershot... http://www.ephotozine.com/articles/sony-cybershot... http://www.ephotozine.com/articles/sony-cybershot... http://www.ephotozine.com/articles/sony-cybershot... http://www.ephotozine.com/articles/sony-cybershot...

We can see at least some detail, in white text and centimetre scale across the middle.
We can dismiss ISO400 image because it's out-of-focus (pretty impressive feat, since f/5.9 on these sensor should have enough DOF).
Looks like noise suppression at ISO1600 is reduced (vs. ISO800), but detail is retained as a tradeoff.
ISO800 and 1600 seem alright to me for this particular set of images, but real-life subjects would be more definitive.

For reference, here are some micro4/3rd images:
Here is Olympus EP-1 at ISO800 and 1600, respectively: http://www.ephotozine.com/articles/olympus-e-p1-v... http://www.ephotozine.com/articles/olympus-e-p1-v...
Here is Panasonic GF-1 at ISO800 and 1600, repspectively: http://www.ephotozine.com/articles/olympus-e-p1-v... http://www.ephotozine.com/articles/olympus-e-p1-v...
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dave9t5's avatar

dave9t5 · 716 weeks ago

Also, your headlines are too sensational since sensor performance relationship to image quality has 2 parts, the sensor and the processing.
"Real World Performance of the Sony Sensor Used in the Pentax Q II" sounds like it is about the performance of the sensor as used in the Q. Maybe it's just poor grammar.

As we have seen in the case of the Pentax K-r and the Sony alpha-55 which both have the same sensor, the image quality is not the same. The Pentax's is better. Therefore, the performance of this sensor in the Sony and Casio compacts cannot predict the performance ceiling in the Q, except to set the baseline.
2 replies · active 716 weeks ago
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RiceHigh's avatar - Go to profile

RiceHigh 110p · 716 weeks ago

K-r and A55 do not have the same sensor.The K-5 does, though, but mind you that there is a translucent mirror in between as for the A55.
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Art's avatar

Art · 716 weeks ago

Look at K-5 and A580 (not A55) on imaging resources. K-5 isn't that better, if at all, in the samples.
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Mike's avatar

Mike · 716 weeks ago

Not bad for so small chip...
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Hector's avatar

Hector · 716 weeks ago

Let see the Q samples. According to the tradition Pentax derive from Sony sensors more then Sony does :)
1 reply · active less than 1 minute ago
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Art's avatar

Art · 716 weeks ago

Myth .. Pentax scores better in charts and graphs but that's just RAW NR applied. Actual images are not better. Look at A580 and K-5 samples on IR
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Enche Tjin's avatar - Go to profile

Enche Tjin · 716 weeks ago

Rice, Ricoh just bought Pentax.. interesting and exciting! what's ur take on this?
1 reply · active less than 1 minute ago
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Richard's avatar

Richard · 716 weeks ago

Hoya will keep Pentax's medical division, which includes endoscope, artificial bone and voice synthesis technologies: ie probably the most profitable part.

What it means, sadly, is the break up of the original Pentax Corporation.

Heaven help us if Ricoh strips the camera division to dress up its own products. A camera world of mainly Canon and Nikon will inevitably mean higher prices all round.
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Koshakas's avatar

Koshakas · 716 weeks ago

ISO 1600 is certainly usable, if you take picture for viewing and printing and not pixelpeeping
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Vlad's avatar

Vlad · 716 weeks ago

Rice where are you? No news about Ricoh????

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