Why is FE 70-200 bigger and heavier than Canon's

Started Feb 13, 2014 | Discussions thread
Erik Magnuson Forum Pro • Posts: 12,247
Re: Why is FE 70-200 bigger and heavier than Canon's

hellocrowley wrote:

Well for RF it's because of the viewfinder limitation, but the 90mm are already very small.

They have narrower tubes because they only need a simple metal helical to move the entire lens unit to focus.  This means the Elmarit 90mm f/2.8 can be a simple 4 element design.   An FE 85mm will need to be a much faster internal focus design. It has to have motors to operate the focus and the aperture.  Something like the Canon 85mm f/1.8 has 9 elements.  (The Sony  85mm f/2.8 SAM is a light 5-element design but still needs internal motors.)

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