What are the (dis)advantages of moving the entire lens for focusing vs. only parts of it?

by null   Last Updated April 17, 2016 08:07 AM

There's a lens adapter available that adapts Leica lenses to Sony mirrorless cameras. It's called TECHART PRO. The key feature is that it allows to use autofocus with the manual lenses.

This works by moving the entire lens back and forth and is advertised to work for most lenses. Most lenses achieve focus by moving a few lens elements, but not the entire lens.

Are there any disadvantages?

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