t024484 Posted October 25, 2009 Share #1 Posted October 25, 2009 Advertisement (gone after registration) Using the computer model that was developed for the noise analysis of the M8/M9, I now used this model to compare the M9 against the D3X. The D3X's Sensor Noise is 61% lower between the two. The A/D noise is 37% higher, but at higher ISO settings this is unsignificant. Sensor size is the same, so there is no printing advantage for one of both. Luminance 13 is the highest possible exposure before clipping. The light blue horizontal line at S/N=3 is the point where the quality of the image is still excellent, below this line, noise is become more and more visible. The lines of the two cameras happen to be crossing at S/N=3 when the ISO value of the D3X ist one full stop ahead of the M9. So ISO 2500 for the D3X has about the same noise performance as ISO 1250 for the M9, and as I have shown in my previous thread, this compares with ISO 640 for the M8. Also ISO 640@D3X = ISO 320@M9 = ISO 160@M8 in noise performance. The M9 is just in the middle between the M8 and the D3X. Hans Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/101462-the-m9-is-just-one-iso-stop-behind-the-d3x/?do=findComment&comment=1089083'>More sharing options...
Advertisement Posted October 25, 2009 Posted October 25, 2009 Hi t024484, Take a look here The M9 is just one ISO stop behind the D3X. I'm sure you'll find what you were looking for!
georg Posted October 25, 2009 Share #2 Posted October 25, 2009 Is there any way to take color & detail reproduction into account? Those measurements became unusable for processed JPGs due to internal filtering etc. and I fear that "processed" (really only pattern noise?) CMOS-images (are the M9-RAWs also filtered?) might cause similar problems. Link to post Share on other sites More sharing options...
t024484 Posted October 25, 2009 Author Share #3 Posted October 25, 2009 Is there any way to take color & detail reproduction into account? Those measurements became unusable for processed JPGs due to internal filtering etc. and I fear that "processed" (really only pattern noise?) CMOS-images (are the M9-RAWs also filtered?) might cause similar problems. These graphs do take the colors into account, because the red green and blue pixels from the raw data are all considered. It is however true that because of differences for spectral response for r, g and b between camera's , a different Color Matrix may have to be used to generate the "normalized" RGB values out of the "camera's" rgb values. This may lead to additional differences in noise properties to what I have calculated. But the relative difference will probably not be influenced too much, so the outcome of my simulation will still be quite valid. Regarding to the resolution you mention, my assumption is that the 24 Mp D3X with moire filter will have roughly the same detail resolution as the 18Mp M9 without filter. A Cmos sensor, because of the different technology, will have to be corrected after conversion for pattern noise and PRNU. This however removes quite a lot of noise and the effect of this is fully integrated in the test results. I do not know if any corrective filtering takes place in the M9, although 4 independent chanels are converted and digitized, so it might be the case for equalising differences between the 4 channels and also for removing other irregularities. Demosaicing and Jpeg conversion are left apart, since many differences exist between various converters, making it hard to compare results. Hans Link to post Share on other sites More sharing options...
t024484 Posted October 25, 2009 Author Share #4 Posted October 25, 2009 P.S. I forgot to mention in the above graphs, that yellow is for the D3X and magenta for the M9. Hans Link to post Share on other sites More sharing options...
carstenw Posted October 25, 2009 Share #5 Posted October 25, 2009 Ah, so the M9 has less noise at low ISOs? I personally find that way more valuable than clean ISO 1600s and so on. Link to post Share on other sites More sharing options...
marknorton Posted October 25, 2009 Share #6 Posted October 25, 2009 Ah, so the M9 has less noise at low ISOs? I personally find that way more valuable than clean ISO 1600s and so on. Don't think so because the D3x ISO is double that of the M9 in each set of results. Even so, the M9 may be wearing a faster lens than the D3x which will level the playing field. Link to post Share on other sites More sharing options...
ulrikft Posted October 25, 2009 Share #7 Posted October 25, 2009 Advertisement (gone after registration) The M9 can use the 0.95 lens, the d3x can use the 1.2-lens. I guess that will level the field somewhat. Link to post Share on other sites More sharing options...
t024484 Posted October 26, 2009 Author Share #8 Posted October 26, 2009 The point was not to prove that one camera is better than the other, I couldn't care less. What I wanted to show is that there is still significant room for improvement for future M camera's. Hans Link to post Share on other sites More sharing options...
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