Check out our #1 PHOTOGRAPHY BOOK on Amazon: http://help.tc/s
OUR STORE: http://sdp.io/sdpbook coupon 'YouTube'
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.

RECOMMENDED PHOTOGRAPHY GEAR:

STARTER CAMERAS:
Basic Starter Camera ($280 used at Amazon): Canon T3 http://help.tc/t3
Better Starter Camera ($500 at Amazon): Nikon D5300 http://help.tc/d5300
Better Travel Camera ($500 at Amazon): Olympus OM-D E-M10 Mark II http://help.tc/em10ii

LANDSCAPE CAMERAS:
Good ($550 at Amazon): Sony a6000 http://help.tc/a6000
Better ($1,400) at Amazon: Nikon D5500 http://help.tc/D5500 & Sigma 18-35mm f/1.8 http://help.tc/s35
Best ($3,150) at Amazon: Pentax K-1 http://help.tc/K1 & Pentax 24-70 f/2.8 http://help.tc/p24

PORTRAIT CAMERAS:
Beginner ($950 at Amazon): Canon T6i http://help.tc/t6i & Canon 50mm f/1.8 http://help.tc/c50
Better ($3,000 at Amazon): Nikon D610 http://help.tc/d610 & Tamron 70-200 f/2.8 http://help.tc/t200
Best ($5,300) at Amazon: Nikon D810 http://help.tc/d810 & Nikon 70-200 f/2.8E http://help.tc/n200e

WILDLIFE CAMERAS:
Starter ($1,100 at Amazon): Canon 7D http://help.tc/7D & Canon 400mm f/5.6 http://help.tc/c400
Great ($3,200 at Amazon): Nikon D500 http://help.tc/d500 & Nikon 200-500 f/5.6 http://help.tc/n500

VIDEO CAMERAS:
Beginner ($500 at Amazon): Panasonic G7 http://help.tc/g7 & Panasonic 14-42mm http://help.tc/p42
Better ($1,400 at Amazon): Panasonic GH4 http://amzn.to/2p5dAmD & Panasonic 14-140 f/3.5-5.6 http://help.tc/p140
Best ($4,300 at Amazon): Panasonic GH5 http://help.tc/gh5 & Metabones Speed Booster XL http://help.tc/mbxl & Sigma 18-35 f/1.8 http://help.tc/s35 & Sigma 50-100 f/1.8 http://help.tc/s100

DRONES:
Beginner ($400 at Amazon): DJI Phantom 3 http://help.tc/p3
Travel ($1,000 at Amazon): DJI Mavic Pro http://help.tc/Mavic
Better Image Quality ($1,500 at Amazon): DJI Phantom 4 Pro http://help.tc/p4p