How to disable view bob in Black Mesa?
Solution 1:
In the Steam version, open Options > Game and set View Roll to 0 to disable view bobbing.
In the free mod version, open Options > Black Mesa and set View Roll to 0.
(The mod version I found has an option labeled Disable View Bob, but it doesn't seem to work)
Solution 2:
Console cl_view_roll 0 got rid of view bob when sidestepping.