(Oct 26, 2013, 03:43)johnytrout Wrote: [ -> ]Thank you for all the information.
I get the main idea of which each process does.
It's how to compensate each one against the other.
I suppose it will take time, but it will come eventually.
Johny, I will attempt to help with your third point.
You might know this already but, if not, it is useful to know that the three series of numbers usually quoted for cameras and lenses, change the effect of the light by a factor of
two times for any
side by side pair:
The light effect increases this way ------>
Typical shutter speed series: 1/1000 . 1/500 . 1/250 . 1/125 . 1/60 . 1/30
Typical aperture series: f/22 . f/16 . f/11 . f/8 . f/5.6 . f/4 . f/2.8 . f/2
Typical ISO series: 100 . 200 . 400 . 800 . 1600 . 3200 . 6400
e.g.1. Shutter speed of
1/30 allows in twice the light of
1/60, and
1/250 allows in half the light of
1/125.
e.g.2. Aperture of
f/2.8 allows in twice the light of
f/4, and
f/11 allows in half the light of
f/8.
e.g.3. The effect of light on the camera's sensor at ISO
200 is twice that at ISO
100, and its effect at ISO
1600 is half that at ISO
3200.
It should now be possible to see how you can adjust each one to, as you put it, "compensate" for another:
E.g. Suppose that the camera suggests that the correct exposure for a scene you are photographing, is at
ISO 200, a shutter speed of
1/250, and an aperture of
f/8.
Suppose that you want to change aperture to
f/11 to get more depth of field.
But that would only allow half of the light into your camera that it actually wants.
So you need to double it to get back to the correct exposure again; EITHER you could -
Change the shutter speed to
1/125 to let in twice the light, OR you could -
Change the ISO to
400 to make the camera twice as sensitive to the light.
Philip