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A very fine acquisition.
If you look very closely at the left hand end of your histograms, you'll see that the foothill for each channel (that is to say the place where the numbers first kick up from the horizontal axis) is well to the right of the vertical axis. That makes the image look like it is taken through fog. Slide the black point for each channel until the histogram kicks up from the origin. That will make the dust lanes look much more prominent with absolutely no loss of meaningful data.
[Edit: I just read Mike Sidonio's comment. I think he's saying approximately the same thing. He's saying that if the contrast on your monitor is too high, and you're adjusting your image by eye, your greys will look black, and you'll think all is fine. You probably need to calibrate your monitor, as he suggests, but the technique I'm describing works even with an uncalibrated monitor: it looks at the underlying data, and therefore how the blacks will look on someone else's properly calibrated monitor, not how it will be displayed on your screen. We do both: we calibrate the monitor AND look at the histogram.).
Best,
MnT
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