Hello everybody, I'm quite new in nuke scripting and i'm facing this problem: 

I know I can access the viewer using

nuke.activeViewer()

I found an example on the net that uses

nuke.activeViewer().node()['channels'].setValue('depth')

this one sets the current viewer's channels on "depth", and you can actually 
see the knob changing its value on the viewer.

Let's say I want to access the zoom: what is its name? what are its properties? 
How can I find one knob's name by myself?

I looked almost everywhere but it looks like there is no way to get the value 
of the current zoom level in the viewer

Thank you very much, help is much apreciated



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