ISO is totally FAKE. Seriously.

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ISO is fake for a bunch of reasons:
1) It's just a post-processing instruction; generally, it doesn't physically change anything about the picture taking process, unlike shutter speed and aperture.
2) While the term "ISO" refers to a real standard, camera manufacturers don't comply with that standard, like, at all. Many cameras are more than a full stop off the proper ISO. For that reason, light meters simply won't work as you expect them to. Using the same settings on multiple cameras will yield very different results.
3) High ISO could be eliminated completely; it's just an arbitrary limit to a multiplication problem.
4) Low ISO could be eliminated by simply using image averaging, allowing us to get long exposures in-camera without using an ND filter. This would also reduce noise in good conditions.


Basic Starter Camera ($280 used at Amazon): Canon T3
Better Starter Camera ($500 at Amazon): Nikon D5300
Better Travel Camera ($500 at Amazon): Olympus OM-D E-M10 Mark II

Good ($550 at Amazon): Sony a6000
Better ($1,400) at Amazon: Nikon D5500 & Sigma 18-35mm f/1.8
Best ($3,150) at Amazon: Pentax K-1 & Pentax 24-70 f/2.8

Beginner ($950 at Amazon): Canon T6i & Canon 50mm f/1.8
Better ($3,000 at Amazon): Nikon D610 & Tamron 70-200 f/2.8
Best ($5,300) at Amazon: Nikon D810 & Nikon 70-200 f/2.8E

Starter ($1,100 at Amazon): Canon 7D & Canon 400mm f/5.6
Great ($3,200 at Amazon): Nikon D500 & Nikon 200-500 f/5.6

Beginner ($500 at Amazon): Panasonic G7 & Panasonic 14-42mm
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Best ($4,300 at Amazon): Panasonic GH5 & Metabones Speed Booster XL & Sigma 18-35 f/1.8 & Sigma 50-100 f/1.8

Beginner ($400 at Amazon): DJI Phantom 3
Travel ($1,000 at Amazon): DJI Mavic Pro
Better Image Quality ($1,500 at Amazon): DJI Phantom 4 Pro