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01-08-2010, 11:07 PM   #1
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Default ISO 200 vs ISO 100

So, i've been doing a little more research on this and came across this on Sony.
Could someone explain what the bolded out section below exactly means? If someone could explain what it is saying below in plain english that would be helpful.

QuoteQuote:
Why is the default ISO setting of Program Auto mode and Manual mode 200 instead of 100?
Applicable Models:
DSLR-A700P, DSLR-A700K, DSLR-A900, DSLR-A700, DSLR-A850
Article ID : 359935 (modified 11/17/2009 11:32:00)
Question:
About the default ISO setting of Program Auto mode and Manual mode.
Answer:
ISO 100 is more effective in avoiding noise, however, ISO 200 is also adequately effective. With ISO 200 or higher, the dynamic range of recording subjects becomes wider by 2/3 EV. Nevertheless, if you are planning on shooting a subject with a nearly full-open aperture or using a large external flash, then it is recommended the ISO setting be changed to 100.
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01-09-2010, 03:20 AM   #2
Ash
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Well it's a good question, one that has been asked many times before without a definitive answer other than that ISO 200 is the native sensitivity for certain sensors (I wonder if that included the Pentax K10D and K-m). Sensitivity set below that of the native level compromises on the sensor's ability to capture the dynamic range it would normally handle.

A lower ISO than the sensor's native sensitivity means the camera's image processor has to adjust the image data after the analog-digital converter converts it to digital form. In the process, the dynamic range is reduced. That's why it's best to shoot at the sensor's native ISO whenever possible.

And here's an old post that may shed some light on the topic practically:
https://www.pentaxforums.com/forums/163780-post17.html
01-09-2010, 10:57 AM   #3
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Thanks Ash, i'll check that out
01-09-2010, 01:13 PM   #4
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Okay i jusrt finished reading that informative post. Which lead me to ask, why didnt design the kx with a native iso of 100? If my assupmtions are correct, having a lower native iso would also drop the higher iso capabilities?

Thanks

01-09-2010, 02:02 PM   #5
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That's the scientific part that I have little knowledge in myself.
There are techno buffs on the forum here that may be able to explain it, but there is a limit to the capabilities of commercially-available technology (the technology is there for sensors with much higher sensitivity and better noise control than we've seen, just not practical commercially).
01-09-2010, 03:48 PM   #6
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I don't know anything about Sony but maybe this refers to something like the extended dynamic range feature in Pentax cameras, available at 2x the lowest available ISO setting and above.

Paul
01-09-2010, 05:50 PM   #7
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Yeah I believe it is. After getting a better understanding of the reason for iso200 being default, I have turned the extended settings back to default of 200-6400. By the way I caught some kids outside skateboarding. I asked them if I could take their pictures. Will post when I get home ^^
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