F = focus
A = aperture
S = shutter
T = think
It was a pretty good tool for me to keep in mind back in the day. I should point out that in those days I, like many photographers, bought film with an ISO value. Some professionals carried multiple cameras with different ISO films in them so they were prepared for lighting changes. I was an amature photographer and on a budget so I did not have that luxury. I would select my film based on the conditions outside and hope they didn't change too much on me.
With DSLR photography life taking pictures is a whole different game. No manual advancing film to take your next shot, no loading film and a pluthera of automation. I try to remind myself of the "FAST" rule even today, but it was lacking something.
Thanks to Apple, there is an "i" this and an "i" that and suddenly one day it came to me, but not before I made an error taking pictures at the zoo. See, I forgot to adjust my ISO setting and ended up taking a number of photos at ISO 3200 outdoors on a bright and sunny day. My Bad! I was able to salvage the shoot, but I also learned something new.
In order for me to prepare better for my photo shoots and changing conditions I created my own new acronym, "iFast." Broken down iFast stands for ...
i = ISO
F = focus
a = aperture
s = shutter
t = think
Now I'm far from being an expert photographer, but I hope this helps me be a better photographer. I hope this helps you take better pictures as I hope it helps me. Feel free to share this with you photo friends!
Enjoy Life, Take Pictures!
BTW ... On Twitter I am @TMSphotos ... I am always willing to connect with photographers.
You are also welcome to follow my Blog here. I try to share knowledge, information and experience of my photography.
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Lastly, here is a zoo photo I made an ISO error on.