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[OM] Re: Analog Forever

Subject: [OM] Re: Analog Forever
From: "C.H.Ling" <chling@xxxxxxxxxxxxx>
Date: Wed, 2 Feb 2005 22:39:10 +0800
Nothing can break the physics rule, you NEED at least two pixel to resolve 
one line pair, the question here is you don't know how they interprete the 
LPH.

C.H.Ling

----- Original Message ----- 
From: "Moose" <olymoose@xxxxxxxxxxxxxxx>
>>
> As I suggested in my reply to C.H., I don't believe this is the case,
> logical as it may appear. Look at the dpreview report on the Nik*n
> Coolpix 5200
>
> Resolution         Absolute Extinction  pixels/LPH
> Horizontal LPH       1400      1650       1.4-1.2
> Vertical LPH         1350      1650       1.4-1.2
>
> The 5200 has 1944 vertical pixels. Now, whatever difference is between
> absolute and extinction resolution, both are much higher than the 972
> your calculation gives. Try the Oly 8080 with 2448 vertical pixels:
>
> Resolution         Absolute Extinction  pixels/LPH
> Horizontal LPH       1650      1950       1.5-1.3
> Vertical LPH         1600      1850       1.5-1.3
>
> And the original EOS 1Ds, with 2704 vertical pixels.
>
> Resolution         Absolute Extinction  pixels/LPH
> Horizontal LPH       2400      2600       1.1-1.0
> Vertical LPH         2000      2600       1.4-1.0
>
> Now I don't know just what this means, but the confluence of numbers
> with those in the Pop Photo review leads me to conclude both are using
> the same measure. On the dpreview site, you can see how these numbers
> are derived by observation of an image of a test target. Just click on
> the target to see the whole thing.
>
> I don't pretend to understand all this, but the theory that resolution
> is limited to half the linear number of pixels is clearly not valid for
> this method of measurement, however defined. And PP believes the
> measures they use are comparable for film and digital.
>
> Moose


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