Dolly Zoom button in the viewport UI

Robinson

Dolly zoom button in the viewport UI doesn't "frame" the selected object, it seems to zoom right out away from it.  Have I misconfigured a setting somewhere?

AbnerK

Mine does does that sometimes with the middle mouse button but the magnifying button works usually. I assume that's the one you're talking about. 

Richard Haseltine

This happens if the object you are framing is far from the origin, especially if you are not looking toward the originI think (it certainly depends on viewing angle, I just can't recall exactly how). If you are using Iray it's not a good idea to have the principal geoemtry far from the centre as rounding errors can produce undesirable artefacts, which isn't to say that the framing issue isn't an issue.