ISO Comparison: D3X downsampled vs. D3 !?

Started Apr 9, 2009 | Discussions
Nils Senior Member • Posts: 1,143
ISO Comparison: D3X downsampled vs. D3 !?

Hi guys,

Before I start this test I was wondering if anyone here has done this or knows any link to this thought!

I want to compare 2 complete same shots taken with D3 and D3X. Now just downsample the D3X file to D3 size and compare the "noise" at different ISO stages. It would be great to see a 100% crop of both images. I have heard some opinions lately that when you downscale the D3X files the noise is even at 1600 as good as the D3, since the DR is supposed to be better.

Any thoughts sofar ?

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Luke Kaven Veteran Member • Posts: 5,705
Re: ISO Comparison: D3X downsampled vs. D3 !?

This is one of the things I'd most like to know. It would answer an important question: Can the D3x equal or nearly equal the D3 at high ISO settings at 12MP?

Which filter was used in the comparison would make a very big difference. The Lanczos filter has the property of reducing gaussian noise. The bicubic filter does not, or does so to a lesser extent.

Nils wrote:

Hi guys,

Before I start this test I was wondering if anyone here has done this
or knows any link to this thought!

I want to compare 2 complete same shots taken with D3 and D3X. Now
just downsample the D3X file to D3 size and compare the "noise" at
different ISO stages. It would be great to see a 100% crop of both
images. I have heard some opinions lately that when you downscale the
D3X files the noise is even at 1600 as good as the D3, since the DR
is supposed to be better.

Any thoughts sofar ?

-- hide signature --

4FR-Photography
http://www.4FR.de

OP Nils Senior Member • Posts: 1,143
exactly...

...thats a very important point. Which downsampling filter is best? I am afraid that if one reduces the noise better it might miss some sharpness.

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Dré de Man
Dré de Man Regular Member • Posts: 194
Re: ISO Comparison: D3X downsampled vs. D3 !?

Hi Nils,

I did a couple of tests - in RAW- like the one you're planning to do at 1600 ISO with a D700 and a D3x and was pleasantly surprised. At 1600 ISO the D700/D3 still don't use noise reduction, the D3x starts using it at 500 ISO and so does Capture NX unless you disable it. The D3x needs this noise reduction at 1600 ISO but NR doesn't kill the resolution advantage at this point. The good thing of the D3x is that it has almost no chroma noise; the image looks great even with NR applied. Conclusion: the D3x gives great results throughout it's complete 'official' ISO-range, as you should expect from a top camera. It's much better than the D300 at 1600 ISO, even though this camera has about the same pixel pitch.

best regards,

Dré

Leo "Zoom" Senior Member • Posts: 1,598
Here it is - D700 vs D3x

Jpeg, NR normal.
Second line - D3x resampled.

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OP Nils Senior Member • Posts: 1,143
Wonderful...did you convert from RAW

Did you shoot in JPEG or convert from RAW. The Results speak for the D3X imho. Whats your POV ?
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Medgyesi1 Regular Member • Posts: 124
Re: Here it is - D700 vs D3x

Wauw! Where is my D700X?!!!!!!!!

Leo "Zoom" Senior Member • Posts: 1,598
Re: Wonderful...did you convert from RAW

That was shot in raw+jpeg. Straight from the camera jpeg was used for this comparison. I had no raw converter, supporting D3x at that time when I did this comparison, thats why I did not use it. But I have original raws also.

I was also impressed to see how small the difference is. But if You pay attention - D3x applies more NR. Fine low contrast details clearly suffer from that. Also D700 noise is more grain-like. So for my eyes D700 is still better for low light, but not that much.

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zkronk Regular Member • Posts: 198
Re: ISO Comparison: D3X downsampled vs. D3 !?
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In my experience downsized 5dmk2 images are superior to d700 images with regard to noise and sharpness (though the d700 images are still stellar).

I would expect the d3x to be even better, given it's higher resolution

photoforfun Veteran Member • Posts: 6,084
Did a test with many samples...

http://www.fotografie.fr/n3-test4-e.htm
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Kindest regards,
Stany
http://www.fotografie.fr/

I prefer one really good picture in a day over 10 bad ones in a second...

photoforfun Veteran Member • Posts: 6,084
D3X is the clear winner in your test...

A confirmation of my own findings.
D3/D700IQ is great, D3X IQ is outstanding...
Given the price difference, it's quite normal...
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Kindest regards,
Stany
http://www.fotografie.fr/

I prefer one really good picture in a day over 10 bad ones in a second...

OP Nils Senior Member • Posts: 1,143
Re: Wonderful...did you convert from RAW

if I understood you right on the prior comment you said that D3X add the NR above ISO 500. Does this also count for RAW and can you turn it off?

Thanks
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OP Nils Senior Member • Posts: 1,143
your my man!

saved me lots of time...thanks !
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duckfat Senior Member • Posts: 1,166
I try to forget these

...and now I have to try again!

bclaff Veteran Member • Posts: 5,102
Re: ISO Comparison: D3X downsampled vs. D3 !?

The Photographic Dynamic Range Chart at my site used values that are standardized to the Circle Of Confusion (COC) of the sensor.
In other words, for the same print size and viewing distance.

Bill (visit me at http://home.comcast.net/~NikonD70/ )

OP Nils Senior Member • Posts: 1,143
So at ISO 800 the DR drops 50%

So at ISO 800 the DR drops 50% ???

Guess the circle of confusion got me now

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m_appeal Veteran Member • Posts: 3,434
Exposures look different between the 2...
n/t
photoforfun Veteran Member • Posts: 6,084
Re: I try to forget these

Keep trying...
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Kindest regards,
Stany
http://www.fotografie.fr/

I prefer one really good picture in a day over 10 bad ones in a second...

Luke Kaven Veteran Member • Posts: 5,705
Re: Wonderful...did you convert from RAW

This might be a helpful test, but to be correct, the samples would have to be converted from RAW with no noise reduction applied whatsoever. Otherwise, the samples are polluted by noise reduction artifacts. And again, we're interested in how the D3x does when downsampled to 12MP, and for that it does matter which method of downsampling is used. I recommend the Lanczos filter.

It is very interesting to see what you have.

bclaff Veteran Member • Posts: 5,102
Re: So at ISO 800 the DR drops 50%

You comment confuses me. Where is this 50% drop?

In any case, yes, except at low ISO you lose 1 EV of DR for each stop of ISO.

Bill (visit me at http://home.comcast.net/~NikonD70/ )

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