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Pansonic G2 vs GH2 sensor
#1
Does anyone have a practical working knowledge of the differences between the sensors of the Panasonic G2 and GH2?



DxOMark indicates that the GH2 sensor is capable of one EV greater dynamic range. Does this seem to be so when working on RAW files? Any other observations regarding the differences between these sensors?



Thank you.
#2
[quote name='CAF' timestamp='1314709121' post='11165']

Does anyone have a practical working knowledge of the differences between the sensors of the Panasonic G2 and GH2?



DxOMark indicates that the GH2 sensor is capable of one EV greater dynamic range. Does this seem to be so when working on RAW files? Any other observations regarding the differences between these sensors?



Thank you.

[/quote]





Well, the sensor in the G2 is identical to the one of the GF-1. I have the GF-1 and GH-2 here.

Even so it is hard to comment on your question. I've used the GH-2 primarily with the 14-140 and this is not the greatest lens ever whereas I've used the GF-1 with some good to great lenses and reached pretty impressive results with it. Anyway, subjectively I'd say that the GH-2 is just slightly better but it is so at a higher resolution.



DxO normalizes the resolution as far as I know. This normalization results in better ratings even if the DR or noise remains technically similar. Basically think of normalization as scaling down to a certain level - e.g 16mp to 12mp.

If you just look at the results without normalization they will look very similar.



#3
[quote name='Klaus' timestamp='1314731568' post='11173']

Well, the sensor in the G2 is identical to the one of the GF-1. I have the GF-1 and GH-2 here.

Even so it is hard to comment on your question. I've used the GH-2 primarily with the 14-140 and this is not the greatest lens ever whereas I've used the GF-1 with some good to great lenses and reached pretty impressive results with it. Anyway, subjectively I'd say that the GH-2 is just slightly better but it is so at a higher resolution.



DxO normalizes the resolution as far as I know. This normalization results in better ratings even if the DR or noise remains technically similar. Basically think of normalization as scaling down to a certain level - e.g 16mp to 12mp.

If you just look at the results without normalization they will look very similar.

[/quote]



While downsizing a higher resolution image to a lower one improves noise performance, DR should be independent of resolution.

To the OP: DXOMARK only analyzes RAW files, not JPEGS.
--Florent

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#4
[quote name='thxbb12' timestamp='1314733060' post='11175']

While downsizing a higher resolution image to a lower one improves noise performance, DR should be independent of resolution.

[/quote]





Is that so ? By downsizing you "increase the (relative) pixel size" or in other words - you will at least improve tonality.
#5
[quote name='thxbb12' timestamp='1314733060' post='11175']

While downsizing a higher resolution image to a lower one improves noise performance, DR should be independent of resolution.

To the OP: DXOMARK only analyzes RAW files, not JPEGS.

[/quote]

Yes, and not all Raw files are created equal <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='Big Grin' />. In short, short of measuring the actual output of a sensor, DxOMark only tells you within a camera brand with more or less the same processing algorithms before saving a Raw file, which one is better for a particular aspect.



Although DxO uses their "benchmark" to compare cameras, one can't really, because not all important parameters are equal.



And DR certainly is not independent of resolution, because resolution is not some independent block wave type function, it is a sinus wave, limited by constraints imposed by physics, optics (lenses), aperture, sensor resolution, sensor size, sensel size, sensor configuration, and A/D to name but a few.



HTH, kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....
#6
Does this imply that the image quality from the EP-3 or EPL-3 is on par with the GH2 ?
#7
[quote name='you2' timestamp='1314793051' post='11187']

Does this imply that the image quality from the EP-3 or EPL-3 is on par with the GH2 ?

[/quote]



Why ? The EP3/ELP3 have basically the old 12mp sensor that was already used on the G1/EP1.

The GH-2 sensor has a higher resolution but basically keeps the DR/N roughly on the same level (without normalization).
#8
[quote name='CAF' timestamp='1314709121' post='11165']Any other observations regarding the differences between these sensors?[/quote]



You can directly compare ISO noise for various cams at dpreview.



http://www.dpreview.com/reviews/panasoni...page11.asp



Just select the cams you are interested in and look at the samples and/or the noise graphs for Jpegs as well as RAW. The GH2 does better than the G2.
#9
Well you said the GF-2 sensor (12mp) was nearly as good as the GH2. I was under the impression (perhaps false) that this was the same sensor in the EP-3. However your answer suggest that olympus is 2 generations behind panasonic.



[quote name='Klaus' timestamp='1314796125' post='11188']

Why ? The EP3/ELP3 have basically the old 12mp sensor that was already used on the G1/EP1.

The GH-2 sensor has a higher resolution but basically keeps the DR/N roughly on the same level (without normalization).

[/quote]
#10
[quote name='you2' timestamp='1314799517' post='11192']

Well you said the GF-2 sensor (12mp) was nearly as good as the GH2. I was under the impression (perhaps false) that this was the same sensor in the EP-3. However your answer suggest that olympus is 2 generations behind panasonic.





[/quote]



"subjectively I'd say that the GH-2 is just slightly better but it is so at a higher resolution."
  


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