In the beginning for me anyway, I tended to use just 100 or 400 ISO film (or ASA as it was then) as I didn't really know any better. I used 100 ISO for normal, everyday use and kept the 400 for either indoors, black and white or colour "grainy" shots. 400 ISO was useful for indoor shots where flash couldn't be used, such as some shows, as with the extra sensitivity, I could still get some decent shots.
The major headache with film photography was that if you wanted to change the ISO settings, you had to change the film itself! Not good if you were in a hurry. There was a way to "push" the film by underexposing it to get faster shutter speeds, and sorting out the mess in the darkroom later, but you still had to "push" the entire film.
The beauty of digital, and I have found myself changing ISO settings so much more often now, is that you can alter the ISO for each individual shot. This means, should you come across a situation where you are in low light and cannot use flash, you can just up the ISO settings to 800, 1600 or even 3200 making the sensor a lot more sensitive to light, and fire away knowing the images will come out ok.
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