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PostPosted: Fri May 23, 2008 8:12 am 
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Did another article today covering ISO and its basics and with some real life examples.

Doing a series of basic digital tips techniques etc on the blog at the moment!

Understanding Basic Digital ISO

hope you enjoy this one as well

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PostPosted: Fri May 23, 2008 10:12 am 
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Although, strictly speaking, the sensitivity of the sensor, as measured by its quantum efficiency, remains constant. What changes when you alter the ISO is the selected gain of the readout amplifiers or, in other words, the way the photoelectrically released electron count is mapped onto the 12 bit (or 14 bit) output from the analogue to digital converters. :idea:

Bob.

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PostPosted: Fri May 23, 2008 10:30 am 
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Bob Andersson wrote:
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Although, strictly speaking, the sensitivity of the sensor, as measured by its quantum efficiency, remains constant. What changes when you alter the ISO is the selected gain of the readout amplifiers or, in other words, the way the photoelectrically released electron count is mapped onto the 12 bit (or 14 bit) output from the analogue to digital converters. :idea:

Bob.


Will add that if its ok :) but once again, Basic ISO understanding. Your just know way too much about everything! ;)

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PostPosted: Fri May 23, 2008 2:01 pm 
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No problem - thanks for asking. It was probably too much information! :oops:

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PostPosted: Fri May 23, 2008 4:16 pm 
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Thanks Bob,

for giving me another excuse to point out the merits of my cheap D40 with it's base ISO200, translating into a high un-amplified/native quantum efficiency! The benefits of a sensor with low pixel-density.

Cheers :-)


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PostPosted: Fri May 23, 2008 4:56 pm 
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LahLahSr wrote:
Thanks Bob,

for giving me another excuse to point out the merits of my cheap D40 with it's base ISO200, translating into a high un-amplified/native quantum efficiency! The benefits of a sensor with low pixel-density.

Cheers :-)

You'll be needing an ND filter then, for those really shallow DoF shots on a bright day when ISO 200 is just too fast! :P :wink:

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