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PostPosted: Mon Jan 28, 2008 10:02 pm 
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If this is infact true, why do people complain about cameras with small sensors and many megapixels? Couldn't they just lower the amount of pixels for the photos in dark spaces, and when you wan't to make pictures for a poster you could turn it up ?

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Last edited by DavidBudde on Tue Jan 29, 2008 3:51 pm, edited 1 time in total.

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PostPosted: Mon Jan 28, 2008 10:05 pm 
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Hi David, i think you got cut-off there!

Think of it as surface area. Bigger sensors or those with fewer pixels can have bigger pixels which are more sensitive to light - hence less need for signal amplification at higher snesitivities - and hence less noise. And higher tonal range too.


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PostPosted: Tue Jan 29, 2008 7:33 pm 
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yeah i did get cut-off. i added the rest now. maybe u see my point.

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PostPosted: Tue Jan 29, 2008 7:59 pm 
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Hi David, this in fact already happens for the highest sensitivities on compacts - it's called pixel-binning, and is why at, say, 3200 ISO, the resolution drops.

But it has to drop a lot - for easy processing, you'd need groups of four pixels, which would quarter your resolution.


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PostPosted: Tue Jan 29, 2008 8:03 pm 
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oh okay,
but if i would have a camera with 8 megapixels and i drop the resolution to 4 using the settings, would the noise on my pictures be half as bad ?

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PostPosted: Tue Jan 29, 2008 8:06 pm 
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It depends on the camera and if they implement this technique - sadly I think most don't. And there might not even be a quarter resolution mode on certain models. Dropping from 8 to 4 wouldn't be enough - you'd need to drop from 8 to 2 to allow groups of four pixels.

David, this is something you'll need to test to find out for sure!

It's an interesting one though, so do share the results - and also compare shooting at full re, then down-rezzing in software...


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PostPosted: Tue Jan 29, 2008 8:12 pm 
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mh.. yeah. it would be useful with cameras which have huge megapixel amounts like 21 or above.

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PostPosted: Tue Jan 29, 2008 8:37 pm 
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Not quite on-topic but I have been discussing the implications of large sensors and/or high pixel counts over in the Canon forum. The post Diffraction towards the end of the thread picks up the topic of (yes, you've guessed it) diffraction and how high pixel densities demand aberration free and relatively fast (low f-number) glass in order to get the best from such sensors.

Bob.

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