jbylake said:
This is all new to me, coming from a film background. How do I know that my camera, a D610, has this capability or not? Thanks,
J.
The demonstration photos above done by braineack were shot with the Nikon D610. So, you're good on that score.
ISO invariant cameras are becoming more common among some camera brands. A Google search reveals some good stuff.
ISO invariant cameras - Google Search
Back to the issue of noise: I think many people make way too big a fuss about noise in digital images. I grew up on film, and newsprint, and plain old 1950's-spec NTSC television images, and 16mm movies in school, and 35mm film images in the theater...I am totally FINE with seeing a bit of the "signature" of the recording medium that was used to make a photographic or cinematic image. I would rather see MORE DETAIL and a little bit of noise in a digital image than a smooth, noise-free, lower-acutance image that has had a lot of noise reduction done to it. By the same token, I can watch a YouTube video in 480, and not whine like my seventh grade son does that, "But it's not in HD!" I can watch "regular TV", and not piss and moan that it is not 4k HD, and so on. I can deal with an image that's not been artificially enhanced to within an inch of its life....some people cannot.
Some people are very,very sensitive to noise. There are still many people out there, shooting with cameras that have fairly substantial noise, both color noise, and luminance noise, in the shadow areas of their images. For those people, under-exposing, and then lifting the shadows and
brightening the picture in software, is just not a very good thing, because the noise that their sensor records in dark areas becomes utterly objectionable. So, how much noise images have depends on the camera that made the image and the software used, and the lighting, and the way each person responds to the image. I dunno...I've seen some danged good images at 6,400 ISO from multiple newer cameras!
The simple fact is that newer, modern-era sensors found in Sony, Nikon, Samsung, Pentax, and Fuji cameras have sensors that produce very low noise levels--and those newer cameras allow the user to deliberately under-expose a shot, leading to a dark image on the camera's LCD screen, and a dark-looking raw image file, but that raw data can be adjusted/manipulated/developed with a number of **modern** software apps that can create an image that doesn't show objectionable noise, OR a serious, ruinous loss of color richness, nor a serious, ruinous loss of overall dynamic range rendering capability.
This August, 2015 dPreview article shows and explains what's going on with a modern Sony-sensor camera:
Sony Alpha 7R II: Real-world ISO invariance study