Thanks. That's a great read. The two points I picked up that I hadn't
previously considered is the effect of diffraction as a limiting factor
on DOF and the effect of diffraction on color accuracy at high resolution.
Also, the fact that the G7 is diffraction limited at f/2 means that the
airy circle is spilling across pixels at any aperture. I wonder if
downsizing the image to combine pixels at some level actually produces a
better image. Moose's 12 MP Canon is probably a good test case.
Chuck Norcutt
Jim Loudon wrote:
>
> There was another LL piece in which Nathan Myhrvold famously summarized:
>
>
>> In the case of the Canon G7, an excellent 10 megapixel point-n-shoot
>> camera (which I also use), it is diffraction limited at f/2. Yet the
>> minimum aperture on the camera is f/2.8.
>>
>
> The back-and-forth between Myhrvold and Charles Johnson, who wrote the
> original LL piece, is worth reading if you're interested in this sort of
> thing. Article here:
>
> http://www.luminous-landscape.com/essays/Equivalent-Lenses.shtml
>
>
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