Why is the M4/3 mount so big

Started Jun 13, 2011 | Discussions thread
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Wellington100
Wellington100 Veteran Member • Posts: 8,257
Why is the M4/3 mount so big

When I look at the M4/3 mount, I wonder why it has such a large diameter. The new Leica 25mm f1.4 lens is mostly plastic, only the centre of the lens is glass.

http://www.43rumors.com/good-news-folks-leica-25mm-lens-will-cost-around-650-euro/

The Panasonic 20mm f1.7 is an even better example of this:

http://www.dpreview.com/lensreviews/panasonic_20_1p7_o20/

Compare this to the Nikon 50mm f1.4. The glass fills the lens:

http://www.dpreview.com/lensreviews/nikon_50_1p4_n15/

Why didn't they go with a smaller diameter mount which would have allowed smaller cameras to look more balanced than they do now:

http://www.dpreview.com/news/1106/11061310panasonicGF3preview.asp

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