|Exp:1/1000, F5.7, ISO400|
Today we are NOT going to talk about manual focus vs. autofocus, or how badly I need a tripod.
We are going to talk about ISO.
I don't know what it stands for, but it used to be the number that corresponded to the sensitivity of film to light.
I'm not using film anymore. I heard Kodak made their last roll of Kodachrome. So now, ISO refers to the sensitivity of the image sensor in your camera to light. Frankly, I don't think I'd be fooling around so much on my huuuuuuge learning curve if I had to buy film and pay for developing all of my errors.
I have to make analogies for all of this scientific mumbo jumbo, so after mulling this over, I came to the conclusion that ISO is like skin tone. The higher the ISO, the more SPF that film or image sensor would need if it were a person.
That doesn't make sense. Yet.
Someone with 1600 ISO or above is very Irish, super white, never tans, only burns, maybe freckles and burns, but he only comes in two colors: white or red. He is VERY sensitive to light.
High ISOs are very good in low light settings, indoor sporting events, churches, museums, plays and other no-flash zones, and blowing out the candles shots. High ISOs don't do well in broad daylight. High ISOs let you use faster shutter speeds and smaller apertures, like a tiny pale white Irish speed demon.
In addition to light sensitivity, high ISOs are noisier. Like Irish people, or Gingers. Noise or grain refers to the undesirable snowy tv effect on a bad digital image. Wikipedia shows a good example. I cannot read that definition though. Super techy.
According to that link I've been using to learn as I go, "100 ISO is generally accepted as ‘normal’ and will give you lovely crisp shots (little noise/grain)."
|ISO200 but sunny|
|still ISO 200|
Somewhat sensitive to light, ISO800 is probably great on really overcast day, or indoors in a normally lit environment.
High ISO = High Sensitivity to Light = Faster Shutter Speed Ability (action shots) = Smaller Aperture (or light hole) enabling you to take nice photos in low light.
Everything I read on the web when I google "benefits of tiny aperture" mentions something called "depth of field." I took a 4 hour photography class called "Getting to Know Your DSLR" two years ago. I was in waaaay over my head, as most of the participants were professional photographers who had recently switched to DLSR from old school fancy cameras. Would you believe the instructor kept using his photos from BILLBOARDS in his presentation? I took pages and pages of notes, and on every page I wrote "DOF" several times. DOF is depth of field.
I still don't know what it is or how to use it. I'll figure it out, maybe not by next week. But, I'll let you in on the big secret in layman's terms when I do. Belt sizes, SPF, light holes, it's what I do. It's the only way it makes sense to me in my head.