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#1
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newb - tell me about ISO
I have a Canon SD550 which lets me adjust the ISO when using the manual
settings. I understand that a higher ISO leads to more detail in the photo but can also lead to more 'noise' in the image. Under what conditions would i set this higher or lower? Are there any general rules about ISO settings? I think my camera goes from 50 to 400. Thanks! |
#2
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newb - tell me about ISO
wrote in message oups.com... I have a Canon SD550 which lets me adjust the ISO when using the manual settings. I understand that a higher ISO leads to more detail in the photo but can also lead to more 'noise' in the image. Lower ISO more detail. Higher ISO more noise less detail. Under what conditions would i set this higher or lower? Are there any general rules about ISO settings? I think my camera goes from 50 to 400. Thanks! If you need to stop something going fast in low light use a high ISO, try it it the camera you will see the shutter speed rise with the ISO, do the reverse to blur a moving object. Try it at various settings and make your own choice as to which sort of images suit which speed. It is not necessary to do what everyone else tells you to. Jem ------------------------------------- Birmingham Independent Photographers http://bip.wikispaces.com/ |
#3
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newb - tell me about ISO
wrote in message oups.com... settings. I understand that a higher ISO leads to more detail in the photo but can also lead to more 'noise' in the image. Less detail actually; the noise obscures the fine detail. |
#5
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newb - tell me about ISO
On 29 Mar 2006 11:30:14 -0800, "
wrote: I have a Canon SD550 which lets me adjust the ISO when using the manual settings. I understand that a higher ISO leads to more detail in the photo but can also lead to more 'noise' in the image. Under what conditions would i set this higher or lower? Are there any general rules about ISO settings? I think my camera goes from 50 to 400. Thanks! Al-Farrob has it pretty right. Higher (or lower) ISO doesn't equal more detail. Higher ISO does mean more noise, which can hide detail. The ISO rating is a measure of the sensitivity of the sensor (digital or film). A higher ISO means the sensor needs less light to make a properly exposed image; it also means more amplification is used, which increases noise. You might use a higher ISO if a lower one would mean too long an exposure. Upping the ISO will let you use a faster shutter speed for the same exposure; it will also let you use a smaller aperture to gain depth of field. But this also means more noise. You've already bought the camera, so taking pictures is virtually free. Take lots, and experiment. Your idea of what's "good" will differ from others'. So take lots of pics, and learn from the results. -- Bill Funk replace "g" with "a" |
#6
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newb - tell me about ISO
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#7
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newb - tell me about ISO
Bill Funk wrote: The ISO rating is a measure of the sensitivity of the sensor (digital or film). A higher ISO means the sensor needs less light to make a properly exposed image; it also means more amplification is used, which increases noise. I think what is really happening is that the sensor sensitivity can't really change, all you are doing is exposing further down into the blacks. Then you can amplify that signal to get the values back up to respectability, but a lot of amplification gives more noise. If I'm wrong about this, I will eat my sensor, but it's a good description of the result. Gary Eickmeier |
#8
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newb - tell me about ISO
Jem Raid wrote:
wrote in message oups.com... I have a Canon SD550 which lets me adjust the ISO when using the manual settings. I understand that a higher ISO leads to more detail in the photo but can also lead to more 'noise' in the image. Lower ISO more detail. Higher ISO more noise less detail. Noise does not necessarily obscure detail, unless the signal-to-noise ratio is quite low. The main factor in detail (i.e. resolution) is the number of pixels. Under what conditions would i set this higher or lower? Are there any general rules about ISO settings? I think my camera goes from 50 to 400. Thanks! If you need to stop something going fast in low light use a high ISO, try it it the camera you will see the shutter speed rise with the ISO, do the reverse to blur a moving object. Try it at various settings and make your own choice as to which sort of images suit which speed. It is not necessary to do what everyone else tells you to. Jem ------------------------------------- Birmingham Independent Photographers http://bip.wikispaces.com/ |
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