Sigma 25 1.4 for m4/3

Started Jan 22, 2013 | Discussions thread
RedDog Steve
RedDog Steve Senior Member • Posts: 1,605
Re: Sigma 25 1.4 for m4/3

clengman wrote:

Ergo607 wrote:

Sigma's patent

The diagram for the Leica 25 for m43 as found on four thirds org

I do not imagine that these are scale drawings. I take them to be schematic diagrams. I suppose there are specifications for the figure of each element listed somewhere. I suppose there may be slight differences in the figure for homologous elements in the two patents, but by and large these are the same lens design.

Without any precise radii or measurements it's more of a block diagram than a schematic.

Either way it's just enough detail to show the general structure without giving away the exact workings.

There's just too much similarity for this to be coincidence.


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Olympus PEN E-P5 Panasonic Leica Summilux DG 25mm F1.4 Olympus M.Zuiko Digital ED 12mm 1:2 Panasonic 12-35mm F2.8 Panasonic Leica DG Summilux 15mm F1.7 ASPH +10 more
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