[HUG] Re: SV: Re: SV: SWC/M

I don't believe that a digital back will work very well on the SWC. The rear element of the 38mm Biogon is too close to the sensor. The light rays anywhere other than the center of the lens will not be recorded or will be recorded incorrectly. The light sensors (pixels) in the sensor silicon are embedded under a plethora of stuff (filters, colored (RGB) lenses, etc, which require the light rays to come in at a relatively perpendicular angle (perpendicular to the sensor surface) rather than at an oblique angle. A digital sensor that captures a super-slide size center portion of the full 38mm 6x6 image might work - with significant vignetting - and begs the question... why? A full size 645 sensor will not work. Digital sensors require retrofocus wide angle lenses. The 38mm Biogon is a non-retrofocus lens. Focused at infinity, the lens is 38mm away from the sensor surface.
These problems do not exist with film. The silver halide molecules are evenly dispersed throughout the emulsion and will accept focused light from any angle. 

Jim


At 04:55 PM 9/27/2007 +0200, Antonio Aparicio wrote:


I think it is a 903SWC with a digital back on it.

Saludos,
Antonio



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