Quote:
Originally Posted by baddog
Yeah, the 18-200 is pretty much perfect for quick change of from head to full. I can adjust the exposure compensation (I do) to make it lighter. Would I be better off leaving that at zero and adjust iso instead?
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more: what exposure compensation does is adjust the meter your in camera, that's all... nothing magical or tricky. you can do that yourself shooting manual or raising the ISO... see BD it's all a weird balance or f stop, shutter speed and sensor sensitivity. and reciprocity.
it works like this in a perfect world: f stops goes from 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, 45, 64, etc and those numbers come from this, if the subject is 8 feet from the light and moves 3 feet closer to the light, you will have to set the stop to F11 to gain the same exposuer... (and here's where it gets real shitty, the damn cameras go from 5.6, 7.1, 8 etc... )
so now here you are at F8 @ 125th and suddenly the light is at F11... so change the expossuer to F11 OR change the shutter to 250th. double the shutter takes an F stop off. i.e. the hole is the same size yet the hole is open only half as long.... see?
then you have the 3rd variable: ISO. so you are at F8 @ 125th at 200 ISO.. whoops F11, set the stop to F11 or set the shutter to 250th OR set the ISO to 100... see? it's a big pain in the ass for sure but those are the rules
do you see how it's moving now?
and it's very difficult for me to write this out because I'm am a bit dyslexic but I think I have got it right for you... I do it instinctively from practice but to write about it I might get it backwards... even sometimes setting my camera up I have to talk it out with myself..