>>4456427
>Proper exposure changes by the minute,
Sometimes, but rarely. More often then not, it's pretty static for long periods of time.
>it really helps to actually use the right exposure
Which is why I shoot M, not A+Auto ISO anymore.
>>4456447
>I can get exposures rangingat the same f/ stop and shutter speed
Obviously your meter will get different readings when you point it differently (which is why A can be worse than M), but that doesn't mean a "proper exposure for the scene" is changing.