Many people have been asking how long the new Panasonic 50-200mm F2.8-4.0 ASPH stays at F2.8. Well the answer is it stops being f2.8 as soon as you turn the zoom ring. It goes to F2.9 as soon as you hit 51mm.
Here is a photo of the imedit change to f2.9 when it leave 50mm to zoom in. Bummer. I an very disappointed.
Photo credit to Carol Hartfree in the Panasonic G9 Facebook group.