OM-D vs GH2 Dynamic Range Test

Started May 8, 2012 | Discussions
Jman13
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OM-D vs GH2 Dynamic Range Test
May 8, 2012

I took my GH2 and E-M5 out to verify that my mind wasn't playing tricks on me, as I've been seeing vastly improved DR with my E-M5. Conclusive test!

http://admiringlight.com/blog/olympus-e-m5-vs-panasonic-gh2-dynamic-range-battle/

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jkrumm
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Jman13, May 8, 2012

Nice test, good to see. Thanks. It doesn't surprise me that the EM-5 has more highlight room since it uses that highlight saving tone curve (and Lightroom respects it) but what is surprising are the nice shadow results.

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Everdog
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You are now on Adventsam's bad list!
In reply to Jman13, May 8, 2012

Prepare to be flamed.

Oh, and thanks for the tests!

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Detail Man
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Jman13, May 8, 2012

Jman13 wrote:

I took my GH2 and E-M5 out to verify that my mind wasn't playing tricks on me, as I've been seeing vastly improved DR with my E-M5. Conclusive test!

http://admiringlight.com/blog/olympus-e-m5-vs-panasonic-gh2-dynamic-range-battle/

A few thoughts about your highlights comparison:

For the base exposure, I metered until the clouds just barely started to clip in the JPEG preview (the shots were all RAW). The final images between the two cameras were right on in exposure (identical mid tone values for the 0EV EC shot) .

According to the JPG-referenced camera metering ... which which results in something on the order of -0.5 EV lower (RAW-level) exposure from my testing of essentially linear EM5/GH2 RAWs. It seems that the 0.5 EV difference (in RAW-level) Average/Peak Ratios that exists renders your RAW comparisons somewhat flawed (because they are based upon JPG-referenced metering) ...

Proposed re-testing procedure : When increasing the Radiometric Exposure in the cameras (in your next step which you describe in your quoted text below), increase the EM5 by 2/3 EV more than you increase the GH2 (in order to closer normalize the actual RAW-level Average/Peak Ratios).

I then increased exposure 3 stops and took a shot and then decreased exposure three stops. I did the same for each camera .

Blowing the smithereens out of the RAW-channels in both cases. Then, you applied LR 4.x's (indeed impressive) widget to fake highlight detail (based up two over-exposed RAWs which differed by around 0.5 EV in RAW-level exposure). While the hybrid combination of LR 4.x + Camera X does indeed have some meaning to those who choose to use LR 4.x processing, I have observed that such ("recovery") machinations are not without down-sides (as the highlight tones are sent downwards into a prominent upper mid-tones peak). No effort was made to show that the test-shots you recorded could actually be processed into what are viable output images ...

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Jman13
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Re: You are now on Adventsam's bad list!
In reply to Everdog, May 8, 2012

Why is that? Anyway, people can flame away. I've taken close to 20,000 photos with the GH2, 6,000 with the gX1, and I know that the E-M5 is smoking them both in DR. I'll have my full review done sometime soon.
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Jman13
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Detail Man, May 8, 2012

What the heck are you talking about? First of all, what the heck do you know about the exposures being unequal in RAW? The exposures were IDENTICAL in RAW. As in, upon direct import into RAW, the levels on the same locations were with in 1% of each other.

Second, Lightroom doesn't 'make up data' on highlight recovery...that's the whole point. If the data is there in the RAW file, there will be data to recover. Blowing the channels will let you know WHERE the pixels still have viable data...as you can see from this test, in both shadows and highlights, much more of the image has viable data in the E-M5 files.

You may have misunderstood how I determined where to start. What I did is use the E-M5 clipping overlay to adjust the first exposure until the clouds were just starting to clip (what would be clipped in the JPEG). The GH2 exposure was then set to match that reference E-M5 exposure, and the resultant adjustments were made manually.

The fact is, in daily shooting, it is obvious that the E-M5 has significantly more highlight headroom. The shadows are much closer. This just gives an idea by about how much.

Detail Man wrote:

Jman13 wrote:

I took my GH2 and E-M5 out to verify that my mind wasn't playing tricks on me, as I've been seeing vastly improved DR with my E-M5. Conclusive test!

http://admiringlight.com/blog/olympus-e-m5-vs-panasonic-gh2-dynamic-range-battle/

A few thoughts about your highlights comparison:

For the base exposure, I metered until the clouds just barely started to clip in the JPEG preview (the shots were all RAW). The final images between the two cameras were right on in exposure (identical mid tone values for the 0EV EC shot) .

According to the JPG-referenced camera metering ... which which results in something on the order of -0.5 EV lower (RAW-level) exposure from my testing of essentially linear EM5/GH2 RAWs. It seems that the 0.5 EV difference (in RAW-level) Average/Peak Ratios that exists renders your RAW comparisons somewhat flawed (because they are based upon JPG-referenced metering) ...

Proposed re-testing procedure : When increasing the Radiometric Exposure in the cameras (in your next step which you describe in your quoted text below), increase the EM5 by 2/3 EV more than you increase the GH2 (in order to closer normalize the actual RAW-level Average/Peak Ratios).

I then increased exposure 3 stops and took a shot and then decreased exposure three stops. I did the same for each camera .

Blowing the smithereens out of the RAW-channels in both cases. Then, you applied LR 4.x's (indeed impressive) widget to fake highlight detail (based up two over-exposed RAWs which differed by around 0.5 EV in RAW-level exposure). While the hybrid combination of LR 4.x + Camera X does indeed have some meaning to those who choose to use LR 4.x processing, I have observed that such ("recovery") machinations are not without down-sides (as the highlight tones are sent downwards into a prominent upper mid-tones peak). No effort was made to show that the test-shots you recorded could actually be processed into what are viable output images ...

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exdeejjjaaaa
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Re: You are now on Adventsam's bad list!
In reply to Jman13, May 8, 2012

Jman13 wrote:

Why is that? Anyway, people can flame away. I've taken close to 20,000 photos with the GH2, 6,000 with the gX1, and I know that the E-M5 is smoking them both in DR. I'll have my full review done sometime soon.

dude - about you, "tests", DR, and 20000... "Alice had no idea what Latitude was, or Longitude either, but thought they were nice grand words to say" (c) Lewis Carroll

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Jman13
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Detail Man, May 8, 2012

Detail Man wrote:

No effort was made to show that the test-shots you recorded could actually be processed into what are viable output images ...

The recovered E-M5 file is a viable output image (sans the clouds...but if I had only overexposed 2 stops, I'd have been able to get all the highlight data back on the E-M5. But the fact is, these were just that...test shots.

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Jman13
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Re: You are now on Adventsam's bad list!
In reply to exdeejjjaaaa, May 8, 2012

I'm still not following. About me? What about me? If people want to flame and personally attack over honestly produced tests on a new camera that may be valuable to others, well, then that's their issue. I frankly don't know who adventsam is or why I would be on his bad list, but well, whatever...

exdeejjjaaaa wrote:

Jman13 wrote:

Why is that? Anyway, people can flame away. I've taken close to 20,000 photos with the GH2, 6,000 with the gX1, and I know that the E-M5 is smoking them both in DR. I'll have my full review done sometime soon.

dude - about you, "tests", DR, and 20000... "Alice had no idea what Latitude was, or Longitude either, but thought they were nice grand words to say" (c) Lewis Carroll

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exdeejjjaaaa
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Jman13, May 8, 2012

Jman13 wrote:

The exposures were IDENTICAL in RAW.

if you are comparing raws you need to use saturation based definition of them being equal as DxO does... do some reading before posting "tests".

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exdeejjjaaaa
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Re: You are now on Adventsam's bad list!
In reply to Jman13, May 8, 2012

Jman13 wrote:

I'm still not following.

if you can't follow - google this very forum

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Anders W
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Jman13, May 8, 2012

Jman13 wrote:

I took my GH2 and E-M5 out to verify that my mind wasn't playing tricks on me, as I've been seeing vastly improved DR with my E-M5. Conclusive test!

http://admiringlight.com/blog/olympus-e-m5-vs-panasonic-gh2-dynamic-range-battle/

Thanks for the demonstration Jordan! Always nice when the visual evidence matches that obtained by other means. As you can see here, my calculations suggest that the E-M5 is about one EV ahead of the GH2 in terms of DR at base ISO:

http://forums.dpreview.com/forums/read.asp?forum=1041&message=41269556

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Jman13
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Re: OM-D vs GH2 Dynamic Range Test
In reply to exdeejjjaaaa, May 9, 2012

I don't do clinical numbers based stuff...it's not my thing. I do real world stuff. I don't sit there with a computer hooked up to my cameras analyzing every tiny detail.

The fact is, same exposures, significantly more detail in the E-M5 file. Take it for what it is.

And do some reading? I've probably read 10x what the average poster here has about photography. You post these inflammatory things bashing (rather nonsensically) my post without providing any real solid reasoning, and then pretend that I'm some noob who doesn't know what he's doing.
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Anders W
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Re: OM-D vs GH2 Dynamic Range Test
In reply to exdeejjjaaaa, May 9, 2012

exdeejjjaaaa wrote:

if you are comparing raws you need to use saturation based definition of them being equal as DxO does... do some reading before posting "tests".

That's not necessary if, as in this case, comparisons were made at both ends (highlight pulling and shadow pushing) with the same camera coming out ahead in both cases.

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exdeejjjaaaa
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Anders W, May 9, 2012

Anders W wrote:

exdeejjjaaaa wrote:

if you are comparing raws you need to use saturation based definition of them being equal as DxO does... do some reading before posting "tests".

That's not necessary

it is... or do not call that joke a test... broken clock can show the right time as you know.

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Jman13
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Re: OM-D vs GH2 Dynamic Range Test
In reply to exdeejjjaaaa, May 9, 2012

Enlighten us, oh wise one...Please tell me how a FULL STOP more highlight detail can be explained away by 'saturation based RAW' stuff....I don't even know what you're talking about, and you seem too obtuse to try and explain it. Please tell me how the exposures can be the same, have the same pixel values in RAW, and yet be so wildly different to dismiss a full stop more highlight headroom, and pretty close to that in the shadows too.

Come on.

Oh, and I'd love to see some of your photos, since you are such an expert, but funnily, I can't find any links to your images.
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exdeejjjaaaa
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Anders W, May 9, 2012

Anders W wrote:

comparisons were made

using a tool that is known to do different processing for different cameras... so you if you want call this a sloppy demonstration that LR produces different results from differently exposed raw files from different cameras then I am w/ you :-)... indeed it does.

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Bob Meyer
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Anders W, May 9, 2012

I don't have an OMD, but based on the large number of comparisons posted in various places, about 1 stop seems accurate. Definitely better, and with 2 years advantage in technology I'd expect at least that much. Were I in the market for a camera today, the OMD would be given serious consideration, which was not the case for the Pens.

Given the price difference, and some of the other features of the GH2 vs. OMD, I'm not sure I'd pay nearly double (with grip), for a 1 stop improvement in DR and noise, but Oly's done a very good job on this camera. It's a no-brainer as an upgrade over the Pens for someone who's committed to Oly.

I hope the GH3 is as big an improvement over the GH2 as the OMD is over the Pens.

Anders W wrote:

http://admiringlight.com/blog/olympus-e-m5-vs-panasonic-gh2-dynamic-range-battle/

Thanks for the demonstration Jordan! Always nice when the visual evidence matches that obtained by other means. As you can see here, my calculations suggest that the E-M5 is about one EV ahead of the GH2 in terms of DR at base ISO:

http://forums.dpreview.com/forums/read.asp?forum=1041&message=41269556

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bgalb
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Re: OM-D vs GH2 Dynamic Range Test
In reply to Jman13, May 9, 2012

Thanks for the interesting information (and photo evidence). I use the GH2 and the E-M5, so doubly appreciate your input.

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Jman13
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Re: OM-D vs GH2 Dynamic Range Test
In reply to exdeejjjaaaa, May 9, 2012

So, you're saying, in real world application, we should use different programs for every camera we own? Well that settles it...That's so much more valuable to the general population than a test that actually compares, you know, how people would actually be USING their cameras.

And please, again HOW THE HECK are these differently exposed? You keep posting that and yet have said NOTHING to back it up.

exdeejjjaaaa wrote:

Anders W wrote:

comparisons were made

using a tool that is known to do different processing for different cameras... so you if you want call this a sloppy demonstration that LR produces different results from differently exposed raw files from different cameras then I am w/ you :-)... indeed it does.

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