Why is D90 betten then D300s at DxOMark Sensor test?

Started Jan 4, 2010 | Discussions thread
olyflyer
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Re: Why is D90 betten then D300s at DxOMark Sensor test?
In reply to DStan, Jan 11, 2010

DStan wrote:

olyflyer wrote:

cluna wrote:

olyflyer wrote:

cluna wrote:

Im curious which settings they used for raw on the 300s vs D90. Since the D300s has more raw tweaking ability, (compressed,uncompressed,compressed lossy, 14 or 12 bit, high iso noise.....) and the 90 has less, it would seem that we should be able to mimic the settings. Active D levels too
Anyone studied it more? I have been curious, but not devoted to it

They are different cameras, as simple as that. Different electronics, different options, different processing, different AF and different exposure. The D300s is simply a different camera made by the same manufacturer.

But that isnt the point of the "DXO Sensor test" . Its purpose is to exclude all paramentrics such as those and only be an indication of unprocessed sensor data. AF and processing have not part in that. ActiveD does however adjust the exposure in addition to processing hence my inclusion.

It's impossible to use pure sensor data. Unprocessed sensor data is just photo transistor data, totally useless, and can not produce displayable images without processing. If you take an image and have it stored on a card it is processed in some way, even if it is a NEF raw image. A/D conversion is already a processing step, even if it is done in an A/D converter.

A digital camera is not just a sensor, if you exclude everything else and you do your own processing to be able to present an image you have a different digital camera. Totally pointless to exclude internal processing, if at all would be possible.

A/D conversion is simply quantization, without it you will have nothing to deal with and all else becomes a moot point. This is one hardware processing step that cannot be avoided. RAW is as the camera maker considers the basic data, you will have to live with it and whatever additional steps they take or have nothing but jpegs which is a whole other game.

Exactly. And before the signal is passes into the A/D converter it is filtered from electrical CMOS noise to make it as clean as possible already at that stage. Pure sensor data is not usable and what we regard as raw is indeed processed in some way before it is recorded. Yes, it is a minimal processing but never the less, it is a processing. Of course, JPEG is a different thing all together, it is not that kind of processing I am talking about.

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