After a LOT of uncertainty, and flying accusations from both sides of the argument, I’ve decided to say it “officially”…
The D300 beats the snot out of the D200 for high ISO performance!
First, let’s see what both cameras do at ISO 3200:
(NOTE: In all comparisons, the D300 is on the left….)

YIKES! Maybe that’s why I never used my D200 at 3200…
Next, let’s see what the D300′s ISO “equals” on the D200. This should be interesting…

D300 3200 = D200 1600? Well, at first glance it appears that even the D200′s 1600 is worse than the D300′s 3200.
HOWEVER, if you view the original size screenshot HERE, you’ll notice that details are a tad bit sharper in the D200 image, although SUPERFINE details are gone in the D200 image whereas the D300 is almost able to get them. (the smallest text on the left-hand edge) But, let’s continue on down the chart and see where the NOISE of the two cameras will equal out:

Hmm, it looks like at D300 3200 VS D200 800, we have finally passed even noise levels. So that puts the D300 at maybe 1.5 EV less noise than the D200, but with not even 1 EV of more resolving power at high ISO…
Perfect, for me at least.
Now while I’m on the topic of D300 VS D200 ISO performance, let’s dispell a myth really quick:
The D300 only does ISO 100 via “LO 1″, while the D200 does ISO 100 native. You may ask, does this mean that the D300′s ISO 200 equals the noise level of the D200′s ISO 100? Or does the “LO 1″ notation mean that it is somehow degraded image quality in comparison to the D200′s ISO 100?
I’m tired of posting screenshots, so just take my word for it:
The D300 at ISO 200 does just as good as the D200 at ISO 100, with almost practically un-noticeably more noise and much more resolving power.
Here’s the tidbits I just can’t help posting:
The D300′s 12 MP resolves exactly the same as the 5D’s at low ISO. At high ISO, a difference is noticeable for sure, the 5D maintains detail like no tomorrow while the D300 needs to rely on noise reduction to achieve the same level of noise. BUT, at least it should be noted that the D300 can equal the 5D for noise at high ISO! If you’re going to make a 16×20 out of 3200 you’ll want to use a 5D, but if you shoot theater like I do and only ever sell 4×6 – 8×10′s, the D300 will do a fantastic job….
(Side note: I remember many many months ago, the talented Scott Robert made a 20×30 print from a 5D ISO 1600 image as a gift to one of his clients, and he actually had to *add* grain to make the print look natural… So, when I’m as big as Scott, remind me to get an FX Nikon!!!)
The D300 at ISO 3200 has almost as little noise as the D2Xs at ISO 400, and almost as much resolving power. WOW.
The D300 at ISO 6400 ALSO comes within a hair of matching the Canon 1D mk3 at 6400!!!! Wow!
And, lastly, it is with mixed emotion that I post *this* screenshot, since I know a boatload of people who own this camera:

You got it, that’s the D300 smoking the 40D for noise levels at 3200, though admittedly the 30D LOOKS less smudgey, even though I can’t really SEE any loss of detail in the D300 image. I’m betting that a little bump of the contras and clarity settings in Bridge / Lightroom and the D300 will look gorgeous…
Alright, that’s all folks!

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