The follow focus gear ring for the Canon EF 28-135mm f/3.5-5.6 IS fits this versatile stabilized standard zoom. It covers wide to short tele and is often cheap used. With gears on focus and zoom it is an easy way into zoom moves.
FAQ
Does the aperture change when zooming?
Yes, from f/3.5 to f/5.6. The image gets slightly darker at the long end during zooms.






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