I “discovered” something interesting about the zebras on the Sony EX1. (I put discovered in quotes, because having looked in the manual I see that this behavior is actually documented - albeit in a fairly obscure manner. Also - I should point out that it was actually Mark Benjamin who brought to my attention the fact that the zebras didn’t match the spot meter function of the camera).

The zebras displayed for “Zebra 1” represent a 10% luminance band centered around the Zebra1 level. In other words, if you set Zebra1 to 90%, you’ll get zebras from 85% to 95% - the zebras start at 85%, not 90% as you’d probably expect.

Zebra2 seems to work as expected, however.

Here is the relevant sentence in the manual:

1 (Zebra1): To display a zebra pattern in the area
of ±10% centering the video level set with
“Zebra1 Level.”

Now you know what that actually means!