Shutter Speed and Aperture

[Ishyid]

Alright, I just want to make sure I am getting this right. When you use a slow shutter speed it is generally used for night photography, because it allows more light to enter, were as a fast shutter speed does not. That is why you use a fast shutter speed to freeze in motion something during the day. But, if you use a slow shutter speed during the day, will too much light enter, and cause your picture to be a bolb of light? Or is that where Aperture somes in. You adjust that accodinly to allow just the right amount of light to enter?

[candleman]

pretty much,
ISO also effects the equation.. thats the sensitivity of the camera to the light that makes it past those two steps.

check this out..
http://digital-photography-school.co...-for-beginners

[pixiedust_photo]

When it is light outside you use a really low ISO and as it gets darker and less light use a higher ISO

[Jim Bryant]

well, the reason behind fast lenses is that they allow a photographer to set the lens at f2.8 to capture fast action sports at both day and night sporting events. Normally, I set my camera on manual, the ISO at 800, shutter speed at 500th and f-stop at 2.8. If you had only a 4/5.6 lens and shooting the same event, you'd be shooting at 60th or 100th a second, which wouldn't be fast enough to freeze the action. Those lens let a photographer capture photos in very low lighting conditions without having to go to an ISO higher than 800.

And, with all lenses, you have to find the right combo of aperture and shutter speeds to get your desired depth of field, so that you're pixs won't become one big blog of light.

[Ishyid]

Originally Posted by Jim Bryant

well, the reason behind fast lenses is that they allow a photographer to set the lens at f2.8 to capture fast action sports at both day and night sporting events. Normally, I set my camera on manual, the ISO at 800, shutter speed at 500th and f-stop at 2.8. If you had only a 4/5.6 lens and shooting the same event, you'd be shooting at 60th or 100th a second, which wouldn't be fast enough to freeze the action. Those lens let a photographer capture photos in very low lighting conditions without having to go to an ISO higher than 800.

And, with all lenses, you have to find the right combo of aperture and shutter speeds to get your desired depth of field, so that you're pixs won't become one big blog of light.

I'm sorry, but ISO controls depth of field? Or was that aperture? I do know that if you use a higher ISO the picture will get more grainy.

[OsmosisStudios]

Higher ISO does increase noise, but that's a drawback. The reason for it is the same as when it was film: higher numbers mean higher sensitivities to light. That means that you can get a short shutterspeed even in darker shots.

[newPerspective]

Originally Posted by Ishyid

I'm sorry, but ISO controls depth of field? Or was that aperture? I do know that if you use a higher ISO the picture will get more grainy.

Its the aperture that gives you the Depth Of Field. Wider aperture = Bokeh affect, narrower = more in focus.

I highly recommend you read Bryan Peterson's book Understanding Exposure'. Its a very good book to get the basics down.

And after that when you start applying those principles you'll find yourself asking specific questions like which aperture for situation xyz and so you turn to gurus here like Jim Bryant, candleman and many others who are willing to help at any stage. (Thanks guys, you are all so awesome.)