photo 101 - the golden triangle...

Darrin Hill

Whenever i would teach a class, i would always give the students a piece of paper that had the following numbers on it..

25 50 100 200 400 800 1600 3200 6400
2 2.8 4 5.6 8 11 16 22 32
1 1/2 1/4 1/8 1/15 1/30 1/60 1/125 1/250

we would take a pair of scissors and cut them up into strips along the dotted line.

and here is how it all works..

Taking a photo usually requires a basic idea... 40x60 enlargement? (uber finegrain film) photo of bride and the background is unimportant? Shallow depth of field by using wide aperture with small number.. Bride jumping in swimming pool and you want to freeze the motion of the water splash? Fast shutterspeed.

but if you have the current conditions (bowl sitting next to window) and you have a low shutter speed, low iso, and a small aperature, those are your settings.. But if you want to change your shutter speed to catch the bee flying above your bowl, you have to speed up your shutterspeed. IF you do that, say going from 1/2 sec to 1/125 you would be loosing 6 units or stops of light... and you need to get them back from somewhere else. Whether by raising your iso to 6 higher units, or by opening your aperture 6 units.

the strips of paper were used to show that if you had a certain combination of iso 400, f8 and a speed of 1/15 (see, they line up vertically... but now u need a shutter speed of 1/60th.. thats' 2 units... move one of the strips over 2 units so that you are getting 2 units more light, and that is your new exposure settings.. it doesnt matter if you use 2 units of an fstop or 1 unit of an fstop comblined with one unit of iso, as long as it's two units...

now you see why photographers are quiet people... when we're taking photos we're constantly having to do math equations in our head and are usually adhd, so we cant spare the brain power to be social.

© 1998 - 2017 by Ellis Walentine. All rights reserved.
No parts of this web site may be reproduced in any form or by
any means without the written permission of the publisher.