Archived posting to the Leica Users Group, 2002/08/17

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Subject: [Leica] Re: digital leica R system
From: Jim Brick <jim@brick.org>
Date: Sat, 17 Aug 2002 12:39:31 -0700

At 03:43 PM 8/17/2002 +0000, Dan States wrote:

>The shot looks quite good!  Which makes me wonder about all the talk we 
>hear about digital needing "special lenses".  It reminds me of the days 
>when CD's were brand new and stereo shops told everyone that their 
>speakers were not "digital ready".  I'm still using my old "non digital" 
>Allisons...hmmm.
>
>Best wishes,
>Dan States


To be true to the sensor frequency, digital cameras (sensors) need 
specially designed lenses.

The current high end SLR digital cameras, like the 1D, D3, D3, whatever, 
have a low pass cutoff filter permanently mounted over the sensor which 
cuts the lens MTF down to that which is acceptable by the sensor pixel 
spacing. So in effect, all lenses are dumbed down to the sensor pixel 
spacing frequency. That's just how it has to work.

Remove that filter and you will get aliasing, color fringing, pixelated 
pixels, vertical stripes turned into a solid, etc. Unless, of course, you 
mount a lens that was designed for a digital sensor.

Sorry... no free lunch.

Jim

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