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12/22/2005 12:01:07 AM · #1 |
Is the ratio of iso to how much light is percieved linear? For example, lets say I am taking a picture in some not so good conditions. I have the iso set to 100 and I have to hold the shutter open for 1/30. If I set it to iso 200, does that allow me to take the picture at 1/60 and get the same image (as far as exposure goes)?
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12/22/2005 12:03:05 AM · #2 |
| yup. if your iso doubles your shutter doubles etc. |
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12/22/2005 12:03:15 AM · #3 |
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12/22/2005 12:04:00 AM · #4 |
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12/22/2005 12:06:03 AM · #5 |
Thanks for the quick help guys. I will go read that thread now.
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12/22/2005 12:06:34 AM · #6 |
| You will get the same exposure. However, it is not linear--every doubling of the ISO is one additional f stop or doubling of the speed. ISO 400 @ 1/125 would give the same exposure as your example. |
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12/22/2005 02:38:00 AM · #7 |
In theory yes but....
ISO numbers are just markers on a dial and are not as accurate as they could be.
A little while back the actual sensitivities were tested by a certain French magazine and their findings were that ISO's on leading dslr's were only approximations of actual sensitivity.
cheers,
bazz. |
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12/22/2005 02:40:50 AM · #8 |
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