Archived posting to the Leica Users Group, 2008/11/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]FRANK DERNIE wrote: >In fact it is both. Leica have ameliorated the microlens > problem by having the outer ones displaced inwards rather > than directly over the light sensitive site. This is > better than nothing but is of course approximate since > the ideal position for each microlens is different for > each lens design. > The more pressing issue is the IR filter. It only filters > the design frequency with normal light rays, since it is > an interference filter. As the angle of incidence changes > the filtered frequency changes. For a SLR lens the exit > pupil is sufficiently far from the image plane for the > deviation from normal to be negligible. With most > rangefinder lenses this is not the case and the correction > needed for the effect is more easily applied if the filter > is on the other side of the lens. Neither of these problems > can be completely addressed using current sensor technology. If I'm not mistaken new technology in the S2's sensor may be able to help with the IR issue. I believe the sensor in the S2 has the IR filter between the microlens and the photosensitive site. I'd guess that in an M camera an offset microlens and IR filter between the microlens and photosensitive site would help fix the problem. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com