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Re: Back by popular demand: Nex-7 vs OMD - Part II
In reply to spacemn,
5 months ago
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spacemn wrote:
LTZ470 wrote:
blue_skies wrote:
LTZ470 wrote:
This is all I asked...correct or false?
A larger sensor should enable one to shoot higher ISO as it gathers more light?
--
--Really there is a God...and He loves you..
FlickR Photostream:
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Mr Ichiro Kitao, I support the call to upgrade the FZ50.
I will not only buy one but two no questions asked...
A larger pixel site would. Image resolution then depends on the total number of pixels.
Typically, camera manufactures keep pixel counts very high, at the cost of high ISO noise. The smaller the sensor, the smaller the pixel site, the lower the useable ISO range.
Re-read my longer post, the EM-5 overstates ISO and this is confusing. It is truly a lower ISO camera.
--
Cheers,
Henry
SO if what you say is so then How does the EM5 at ISO 200 compare to Nex-7 at ISO 100? Your saying that the EM5 is actually at ISO 50? And Olympus is lying about ISO?
Hard to believe to say the least?
...
This may answer your question:
The ISO discussion has nothing to do with sensor size. It is a discussion of what the manufacturers are saying the ISO in their cameras are vs the actual ISO.
On the graph you can see that when the OMD shows ISO 6400, then the measured ISO (measured sensor sensitivity) is actually 3200. Whereas the NEX-7 is very close to measured ISO 6400 when claiming it.
Yes, ISO 200 on OMD is actually measured to 100. For NEX-7 ISO 100 is measured to around 80 for some reason.
This is what "cheats" the user in believe that they are using IS06400 in the OMD when they actually only are using what is equivalent to ISO3200.
That DxOMark graph has nothing to do with whether or not the sensor is "cheating". You are mis-interpretting that graph.
DxOMark has to determine that ISO number in order to compare them on equal ground. Typically, cameras further from the actual ISO (below) are better performing sensors. Typically, all that means is that the manufacturer might be trying to prevent clipped highlights by push processing the exposure.
Any review sites should easily catch this by shooting in manual exposure mode.
Eric
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