 Posted 3/21/2008 8:18:35 AM
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Thank you so much, if there is anything else you can think of I would so appreciate it, even if just to point me in the right direction. I have unlimited funds for college but no where to go here except online. I dont have a problem with online learning but find that for things like this, its best to really go out and do. Thanks again so much and please, any direction is very welcome.
Leah Keese, Photographer, Dreamer, Obnoxious Redhead.....
"No one wants advice - only corroboration"
~John Steinbeck
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Posted 3/21/2008 9:23:47 AM
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Hi Leah,
There is a book you may find helpful. You already said you have an easier time understanding when you do it. In this book the author explains (many times with visualization), then uses examples and then has an assignment to try it out with your own camera. It is called Understanding Exposure by Bryan Peterson. I'll try to give a condensed explanation about ISO from the book. Getting exposure right involves the Photographic Triangle. Shutter speed, aperture, and ISO are the important factors and the heart of every exposure. Think of the ISO as a worker bee. If my camera was set to ISO of 100, I have, in effect, 100 working bees. You have set you ISO to 200 so you have 200 working bees. The bees job is to gather the light that comes through the lens and makes an image. If we both set the aperture to 5.6, meaning that the same volume of light will be coming through our lenses, you will record the image the quickest you or me? You would because you have twice as many worker bees. So how this relates to Shutter speed is that your 200 working bees need only half as much time to get the job done then my 100. If the correct SS was 1/125 at ISO 100 and you raised it to ISO 200 your camera would be able to increase the SS to 1/250. If you changed the ISO to 400, you went from 1/125, passing by 1/250, and ended up at 1/500 of a second. Just like halving the shutter speed is called 1 stop, each change from ISO, from 100 to 200 to 400, is considered a 1 stop increase (an increase in worker bees.)
As far as your camera goes you would probably get the best answers from someone who is familiar with that same camera. They would know how to set bulb, what kind of release cord would work, etc. If no one answers on this thread maybe you could start a topic asking about the Nikon D80 specifically.
Linda
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