Key binding question when using cannon sights

[Blitzen]

This is probably pretty simple but the solution defies me.When using the cannon sight( that is in the "Nestle in to" key stroke ) I get a clear view with range finder .However when I use the telephoto ( that is enlarge the sight picture ,)the first time I press the key ( same key as I use in aircraft to do the same thing,) the cannon resets to what i might call a neutral position, where it will stay until I hit the same key again & then I can use the mouse to control movements of the gun,to fire the gun etc..If I release this key & hit it again for another target the cannon again resets to a neutral position & I start the process all over again. This "re-setting takes time & is irritating as hell. I'm guessing that i have somehow bound up this particular key with two actions. The telescopic /closeup one is easy to find, but I have no idea what might pass for "re-set gun to neutral" or some other similar command that might be perfectly understandable in flight but make no sense in Tanks...Any idea out there?

Oh I am using Rift if that makes any difference.

[NETSCAPE]

I'm not in VR. I'd say "kill" whatever control you are using and having that trouble with. Instead use mouse scroll wheel to "zoom in" your view. If the zoom-in aspect is not your issue let me know better.