MMB scrol <=> zoom ratiol

Hi ,

Anybody could advice how to set smooth zooming on MMB in Blender?
Default zooming w/MMB produces ‘big jumps’ w/out possibility of precise setting zoom ratio…
(And yes-Logitech applet installed, Scroll speed set to 1 row - no influence.

Have almost the same problem :frowning:
Customized a bit navigation (made it Maya-like).
After that pan and dolly in the scene became impossible, it’s about 4 times faster than usual.
Can anybody help with it?