High ISO works on my 10D but not FZ10

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Hi All,
I own both the 10D and FZ10. I am able to use high ISO on my 10D say
ISO800 and the image is still very good. But on my FZ10, anything beyond
100 is useless (too much noise). Technically, what is this ISO in digital term
and why the huge different between the ISO performance of these two
cameras? :confused:


Senior Member
Sep 19, 2003
In this small world
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ISO in digital or film is still called sensitivity, just that it is working differently, one using emulsion (film) while the other using semi-conductor called photodiodes (digital).

In today's digital camera's, most compact and prosumer cameras are fitted with a less than 35mm sized sensor. Only for the Kodak SLR and Canon 1Ds and 1Ds Mark II has the same sized sensor with the 35mm film. The 10D has a slightly smaller sensor than the 1Ds, a FZ10 has only a 1/2.5" sensor, much smaller than the 10D's. With a smaller sensor, there will be less space between the photodiodes, causing more noise than one with similar megapixels but much bigger size sensor.

Most compacts and prosumers are not built for high ISO (400++) that is good for indoor shots without flash. Only a few I know, the Fuijifilm and Panasonic ones, are better indoor but still limited.


New Member
Oct 3, 2003
kiwi land
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:thumbsup: for theITguy :)

Digital SLRs use mostly APS sized sensors (approx. 23.7 x 15.6 mm) or 35mm sized sensors (36 x 24 mm).
whereas 'compact' digitals use at most 2/3" sensors (approx. 8.8 x 6.6 mm)

smaller sensors produces more noise, larger sensors produces less noise (at least for current digital camera technology)

usually i will stick to iso 50 if i use 'compact' digital cameras.


Thanks iwan, theITguy and megaweb for the response, and it helps a lot. The dpreview website is really cool. It looks like we can safely conclude that the size of the sensor really matter when comes to quality or low noise images.


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