I think the notion of FF = heavier lens may not be true

Started Nov 8, 2013 | Discussions thread
EinsteinsGhost Forum Pro • Posts: 11,977
Re: Understand why the earlier 4/3 lenses were so large, and the current ones aren't

TrapperJohn wrote:

For a more accurate size comparison, use the µ43 size optimized lenses like the 45 1.8, 75 1.8, 12-40 constant F2.8, 12-35 constant F2.8, 20 1.7, 17 1.8, etc... they are very small for what they can do.

The m43 size benefits comes from its crop factor, just as a camera with 1/2.3" sensor can deliver a 35-600mm (equiv) f/2.8 zoom range, again due to crop factor. But, we could also compare lens sizes and weight by focal length (not equiv.).

Minolta 35-105 f/3.5-4.5 N, a full frame lens for example, was 60mm long, with 55mm filter size and weighed 290g.  Whereas, Panasonic 35-105 f/2.8, a m43 lens, is 100mm long with 58mm filter size and weighs 360g. The Panasonic, of course, offers constant f/2.8 zoom which would account for the size gains but the point is ultimately with focal length itself, rather than equivalent FL.

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