Gear Talk > Third Party Manufacturers
DxO: 24MP Nikon D3200 equals 22MP 5D Mark III
wickidwombat:
Nikon D3200 Hands-on Review
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yay digital rev review of the 3200
dilbert:
--- Quote from: neuroanatomist on June 09, 2012, 06:38:09 PM ---
--- Quote from: dilbert on June 09, 2012, 04:35:35 PM ---As it happens, DxO publish the full test results for sensors, so that if you want to see what the components are that make up a given score, you can. It's those other numbers that are actually of interest.
--- End quote ---
Ahhhh, but there's the rub. Olympic judging is subjective in nature - judges often disagree, there are accusations of bias, etc. DxOMark purports to be objective, and in fact, their measurements, which are supported by their published methodologies, are objective and useful. But can you point me to a detailed explanation of how the individual measurements are used to generate the DxOMark Sensor Score? No, you cannot - DxO doesn't disclose that methodology. That makes the Sensor Score as subjective as an Olympic judge giving every performance by someone from their home country a perfect 10.
--- End quote ---
So just because the formula they use to calculate their sensor score is not disclosed it is therefore subjective?
That's a very very thin argument and you know it.
Maybe they consider that formula to be a trade secret and therefore do not wish to publish it?
But lets face it, even if they did publish it and it was found to be objective, all that would happen then is that everyone would criticise how they calculated it - why does X have a greater weight in the score than Y and so forth.
briansquibb:
--- Quote from: dilbert on June 11, 2012, 10:41:20 AM ---
--- Quote from: neuroanatomist on June 09, 2012, 06:38:09 PM ---
--- Quote from: dilbert on June 09, 2012, 04:35:35 PM ---As it happens, DxO publish the full test results for sensors, so that if you want to see what the components are that make up a given score, you can. It's those other numbers that are actually of interest.
--- End quote ---
Ahhhh, but there's the rub. Olympic judging is subjective in nature - judges often disagree, there are accusations of bias, etc. DxOMark purports to be objective, and in fact, their measurements, which are supported by their published methodologies, are objective and useful. But can you point me to a detailed explanation of how the individual measurements are used to generate the DxOMark Sensor Score? No, you cannot - DxO doesn't disclose that methodology. That makes the Sensor Score as subjective as an Olympic judge giving every performance by someone from their home country a perfect 10.
--- End quote ---
So just because the formula they use to calculate their sensor score is not disclosed it is therefore subjective?
That's a very very thin argument and you know it.
Maybe they consider that formula to be a trade secret and therefore do not wish to publish it?
But lets face it, even if they did publish it and it was found to be objective, all that would happen then is that everyone would criticise how they calculated it - why does X have a greater weight in the score than Y and so forth.
--- End quote ---
As we dont know how the numbers are produced then we cant decide how valid they are. Ergo the numbers are unreliable in a comparison.
For all we know there maybe a huge bias for mp and DR at iso 100, and nothing for DR at iso3200.
neuroanatomist:
--- Quote from: dilbert on June 11, 2012, 10:41:20 AM ---So just because the formula they use to calculate their sensor score is not disclosed it is therefore subjective?
--- End quote ---
Exactly. They state it's a 'weighted average' but give no explanation of the weighting. Therefore, meaningless.
The EPA mandates a method for calculating fuel economy of cars sold in the USA - anyone who's looked at that sticker on the side window then actually checked the fuel economy empirically knows that the sticker value bears little resemblance to real world use. But...it's an objective measure, and thus useful and menaingful for comparisons. If car manufacturers, for example, could use different standards for a Hummer vs. a hybrid, it would be completely useless.
I have stated and do maintain that the DxOMark measurements are valid and useful. DxO themselves state that one should first consider resolution, then consider use case, then look at scores. Personally, I don't bother with scores - I go straight to the measurements (and not the 8 MP-normalized ones they use to generate the Scores).
DZY:
--- Quote from: lola on June 11, 2012, 01:42:31 AM ---
--- Quote from: DZY on June 10, 2012, 07:28:32 PM ---Putting too much weight on DXO is a wrong strategy.
--- End quote ---
Until they favor Canon!
--- End quote ---
1. I have or use neither N nor C.
2. I was talking about buying a camera in general, no matter what brand.
3. even if DXO would favor C, it is still not smart to take DXO as a major key.
4. follow your attitude, at this moment when N has higher DXO, if any shooter who has a Nikon body but doesn't get good pictures, then the shooter should be the major weak point, not the machine. So blame yourself. Those who have Canon body, can blame the machine and look down the nikon user ... I just joke.
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