Digital BW, The Print

Hi Andre,

I'm not Ernst but I hope you won't mind me chipping in with a comment here.
It's easy to explain why there can be varying amounts of "chromatic
abberation" and "vignetting" with different digital sensors. I put those terms
in quotes because in digital capture they have different causes than their
counterparts in film-based shooting. The physical construction of the sensor
sites, and most relevantly the depth of the sensor site wells in the surface
of the silicon, can influence the way the response of the sensor changes with
the angle of incidence of incoming light rays. In the case of many wide-angle
lens designs, light striking the edges of the frame can travel at a fairly
oblique angle, and if these lenses are combined with a sensor that is very
susceptible to the direction of the incoming rays, then you will get more
noticeable light falloff in the image.

The amount of colour fringing can be influenced by the sensor construction and
the type of anti-aliasing filter used. Although this effect is not strictly
the same thing as chromatic abberation, it appears similar and the terms are
often used interchangeably.

The one I'm more sceptical about is geometrical distortion. Any sensor will be
very nearly perfect in terms of rectilinearity (and flatness, come to that) so
distortion and focus plane issues should disappear in the digital capture
world.

HTH

-= mike =-

-----Original Message-----
From: Andre
Sent: 18 November 2004 21:46
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] Re: Canon 1Ds MK II



--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla
<E.Dinkla@c...> wrote:
> Andre wrote:

> The German Magazine Color Foto is probably one of the first that 
> published test results of the same lenses on different sensor types.
> 
> Ernst

So Ernst, what's your take on the body lens relationship ? Are those results
disputable or should they be taken into consideration ?

Andre


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