Ysarex
Been spending a lot of time on here!
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I am not in agreement with that statement.. not since the Canon 5D was my primary camera, back in 2006. With "some", older d-slr models, yes, lost-ISO meant BEST quality, for sure, but since ISO-invariant sensors were developed, and since SONY developed the Exmor generation of sensors, the old admonition to "use the lowest ISO" has been rendered an old-fashioned idea.
Honestly I think that "use the lowest ISO" was advice given in good faith to beginners, but wasn't good advice as it led many to fear the ISO. Expose to the Right theory I think was pushed hard by many because it did start to push away the "always use the lowest ISO" mantra. OR at least "expose to the right theory!" was as fast to type and yet if looked into properly by anyone learning, would yield them a greater basic understanding of how to work their cameras to understand what "the lowest ISO" actually meant (since rarely did it mean ISO 100).
I also agree that even without Invariant camera sensors, the technology has continued to advance to the point where many lower ISO's are very very good. Heck at the rate we are going I figure that with enough years we will likely reach a point where the ISO setting almost becomes meaningless to the average photographer. When you can go from 100 to 6400 and get very similar performance - or heck even higher
Yes, even higher.
I have the benefit of getting a crop of new students each semester and I rarely get one who's a complete virgin. In other words they're all Youtube polluted in one way or another. They come with a set of pretty uniform misconceptions. They have their camera's set to manual because that's how you get control of the camera instead of letting the camera do it for you. As a result half of them "meter" the shot by chimping the LCD. I pound my head on the table. They believe ISO causes noise and they resit raising ISO -- I literally have to raise my voice screaming "get the bleep bleep photo for bleep's sake and raise the ISO." I tell them to put the ISO on auto and just pay attention to it. That can help but the "pay attention to it" part goes out the window pretty quick. And as for trying to explain to them the finer points of what's actually happening under the hood (as in this type of thread) -- I don't dare, sad to say. Is "use the lowest ISO to not get noise still out there?" It sure is and it does substantial harm. I get a regular stream of blurry photos at shutter speeds from 1/60th to 1/10th sec. shot indoors at low ISOs.
As for even higher:
That's ISO 12800 from my Fuji XT-2. It's a low DR scene and I did noise filter it with a light hand. Seriously, if you need it learn to use it and use it.
Joe