Hi all , could anyone advise me what the following means . ISO 200–12800, expandable to 100–51200.
I see some cameras have 100-51200 native but others have iso 200-12800 . Is that a bad thing ?
Short answer... no.
There is an unfortunate aspect in modern engineering of consumer products where those making them seem to think those consuming them are stupid. (Can we say idiot lights... err.. nevermind.)
The cameras of past (film) has film speed settings as low as 6 speed and crept up to a maximum for most applications of 6400.
There are in fact many cinematic films (cine) that run down to a 2 speed and was also used as reproduction and archiving film from the past.
But marketing the way it is these days seems to think that people want higher speeds more as a bragging right than actual useful application. So now we have the "magical" 3,000,000,000,000 speed sensor (yes I am exaggerating) and somehow thats going to give folks stop motion photography and discovery of ancient aliens and jimmy Hoffa.
But no physical shutter is actually capable of moving that fast without exploding. The sensor is being switched on and off rapedly and therefore negating the physical shutter alltoegther.
This is why mirrorless works the way they do.
But what most dont know is that the high ISO numbers as previously pointed out affect the image quality and render in many cases the mechanisms of the lens in weird ways.
The sensitivity of the picture is part in part of the overall function (the "f" in f stop) and unless you know how to compensate for such things as reciprocity failure (
What is Reciprocity Failure? - The Film Photography Project) , inverse square etc, your spinning wheels.
First thing is to understand how the sensitivity (speed) works to understand WHY those numbers are what they are, and NO they are NOT fake!