kenwood33 Goldmember 2,616 posts Likes: 26 Joined Jul 2005 More info | May 10, 2010 06:23 | #1 I notice that as I increase the ISO, the picture counter (# of pictures you can shoot before card runs out) decreases. For example on a 16g card, with a xsi, at iso 100, counter is at 1000; at iso 200, counter becomes 950; and at iso 400, counter reduces to 900 (rough numbers). Just wondering what is the reasoning behind? Does the camera keep more data at higher iso? So maybe it is a good idea to always shoot at the highest acceptable iso to capture the highest amount of data/detail?
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NinetyEight "Banned for life"  More info | May 10, 2010 06:25 | #2 It's because there is more noise at higher ISO's and this gets recorded as 'detail' Kev
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Scott_Quier Senior Member 888 posts Joined Jul 2006 Location: Newport News, VA More info | May 10, 2010 06:40 | #3 kenwood33 wrote in post #10153024  I notice that as I increase the ISO, the picture counter (# of pictures you can shoot before card runs out) decreases. For example on a 16g card, with a xsi, at iso 100, counter is at 1000; at iso 200, counter becomes 950; and at iso 400, counter reduces to 900 (rough numbers). Just wondering what is the reasoning behind? Does the camera keep more data at higher iso? So maybe it is a good idea to always shoot at the highest acceptable iso to capture the highest amount of data/detail? As NinetyEight said, you get more noise at higher ISO and this looks like image detail to the routine that compresses your image data. Detail does not compress as well as smooth texture, thus images at higher ISO (as a rule) will not compress as well, making them larger when stored to your card. Scott
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sapearl Cream of the Crop  More info | May 10, 2010 11:45 | #4 No - not all. You will introduce more "ugly" noise into the image. Even extremely low ISO images can suffer from some noise. Most cameras have optimum sensor/ISO characteristics and deliver the best images at that ISO setting. kenwood33 wrote in post #10153024 I..... So maybe it is a good idea to always shoot at the highest acceptable iso to capture the highest amount of data/detail? GEAR LIST
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yogestee "my posts can be a little colourful"  More info | May 10, 2010 12:00 | #5 NinetyEight wrote in post #10153027 It's because there is more noise at higher ISO's and this gets recorded as 'detail' This is the case.. Jurgen
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egordon99 Cream of the Crop 10,247 posts Likes: 3 Joined Feb 2008 Location: Philly 'burbs More info | Also, noise (by definition) is random. Random data does not compress well.
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