kckmarc wrote in post #18336942
those are 10k+ on the 7d2, wow. very nice. maybe i should work on my post production NR skills
Every camera has its inherent noise, but lots of times, noise is much more visible than it needs to be because of processing and display methods.
Just one very vivid case in point: If you have the image viewing program, "Faststone Image Viewer", load a full-res very high ISO image into it, and go to fullscreen mode. If you bring the pointer down to the left end of the screen at the bottom, a toolbar opens with a checkbox that says "Smooth". Check and uncheck this box, and look at how the noise changes in the image. Two people, using this same software, not aware of the "Smooth" option, would get very different impressions of the same image, noise-wise! These kinds of illusion are rampant in people's experiences with cameras.
As objective as imaging might at first seem, it is far from it in the way it is generally experienced.
If you make a triptych of 3 different full-resolution conversions of the same high-ISO file, one with lots of NR and no sharpening, one medium, and one with no NR and lots of sharpening, take the same 1/3 from each image to make the triptych, and then toggle the "Smooth" button again. You will see a much greater range of apparent noise than just with the single conversion. You can use the + and - keys to change the zoom ratio, and you will see that the smaller you make the full image, the worst it gets with "Smooth" turned off. Lots of folks don't even know if their processing or viewing methods have "Smooth" off or on!
Over-sharpening for the task at hand, and poor resampling methods, can both destroy an image, relative to what it can be.