I was examining the full-resolution test chart photos of the D200 and D2x from DPreview. When I zoomed in 100% to some very closely spaced diverging lines of the test chart, the D2x had very obvious moire while the D200 had hardly any moire. I think that this may be because the pixel spacing in the D2x happens to interfere with the line spacing. But if this is the case, how do you explain why the D200 doesn't exhibit much moire anywhere along the gradually diverging lines?
Many posts and reviews on the internet say that the D2x has superior image quality. In certain respects I agree, but the D2x seems not to be up to the D200 when it comes to managing moire. Indeed, even the test charts from the Canon 5D and 1Ds MkII have more moire than the D200.
Although all the cameras I mentioned have higher resolution than the D200, doesn't the moire offset the resolution advantage? I am thinking that I would rather have slightly lower-resolution, smoother images than to have moire rearing its ugly head in certain spots when I blow up certain images.
Besides moire, the D2x has 0.5 stops less dynamic range and visibly higher noise than the D200, according to tests done by DPreview. Can someone explain tangibly how the image quality of the D2x is better than the D200? For example, Thom Hogan says that the D2x images are 'less digital' and have 'higher acuity' but I am not sure how they can appear less digital if there is more moire, for instance.
Is it color that makes the difference?
#1. "RE: Moire in D200 and D2x" | In response to Reply # 0jdbower Registered since 12th Jan 2006Wed 02-May-07 11:42 AM
The moire is an easy answer, the D200 probably has a stronger anti-aliasing filter. This reduces moire but also reduces sharpness so it's a give or take. I remember seeing some posts about a guy who removed this to get sharper images, but this would have a nasty effect on a moire test.
In general, newer generations of sensors learn from the older generation. The flaws discovered in the D2X design and deployment can be worked on for the D200. The D80 is nominally the same sensor as the D200 (it's lacking some output ports so the speed is slower), but the D40X sensor may outperform the D200 sensor in some respects despite being a cost-reduced 10MP sensor (my understanding is that it is completely different from the D200/D80 sensors).
As to why the D2X IQ is considered better to some, it really depends on what you're measuring and how you weight that measure. Someone who doesn't care about moire may prefer a sharper sensor, color rendition may be better for skin tones but this could ignore results for rendering the greens in a landscape. I only hope that someday the subtle IQ of the sensor becomes something that matters in my shots because that means I've nailed everything else pretty well
#2. "RE: Moire in D200 and D2x" | In response to Reply # 1mojobebop Registered since 29th Mar 2007Wed 02-May-07 11:50 AM
I have noticed some on occasion on the lcd.
Whenever shooting patterns w/closely spaced lines:
(ex: escalator steps).
I have yet to download to computer, so I do not know
if it was just the lcd.