Camera Talk

Does this make sense to anyone?
I really do not understand what this is all about so I wanted to know if any of you had make sense of it.

Does it mean that:
- Sensors are better and more sensitive so they can take pics between "ISO" 100 to 1600 and have little noise?
- The lower ISOS are there for comfort and to allow for longer exposures / shallow DOF?
-

What is it that stops varying?

i saw this on Canon Rumors site.makes sense. simple enough. it's something most of us do any to a greater or lesser degree.




''You shoot at the lower iso, underexposing enough to prevent non-specular hilites from being clipped.
You then raise everything up in post so that you can get a normal looking image as tho you'd exposed it properly.
You can control how much you want to raise the levels in post so you decide.
'This only works well with ABC cameras (Nikon Sony Pentax Fuji Olympus .. see who's missing ? )''