BobYIL
Well-known
nice thought, Keith.
The problem with ff sensors is the need for retrofocus lenses. Manufacturers have tried to get around the problem (of oblique rays hitting the sensor) using offset microlenses.
What I want to see is a digital ff sensor that is curved in 3 dimensions (like a bowl) to allow a plane of focus that is equidistant from the lens exit element across its entire surface. That would enable existing M-lenses to focus accurately across the entire frame without the problems associated with oblique rays or work-arounds like offset microlenses.
That would be nirvana!
Having worked for Texas Instruments for IC and Darlington production I doubt that an efficient masking technology could be developed for spherical surfaces, especially for today's requirements of generally less than 1-micron resolution. Etching could be another substantial issue as depth is to be measured in reference to a plane.
Also, such a curved surface would work fine with lenses of over 45-50 degrees, but what about the teles?
I think this was one of the reasons why the major players were (apparently) cautious in jumping into the mirrorless sector; what the Nex-7 wrt the Nex-5N has pointed to: Offset microlenses seem to be the only solution and not a costly one; however they function well with CCD-cells but not so well with the CMOS.. Certainly there should be a R&D going on in regard to this issue.
Also, pure conventional designs might not work well on the CCD-microlenses too (Biogon 21/4.5 or Summilux 24/1.4 corner smearing or color shift issues.. ) The best design approach is from Fujifilm XP1, totally custom design with huge rear elements however they were to cover only APS-C format.
IMHO, there could be also another factor for this: The future full-size due to AF and size requirements could well be the APS-C size.. Today the APS-C can easily satisfy the ISO-6400 capability, resolution of 24MP (next year most certainly over 30MP) and the lens design for this format could be less problematic than the one for FF.. I think Leica too is working on this format for their future models, we might even see a concept camera in this Photokina. (AF is unavoidable for any company to survive.)