Hi,
As far as a UI control to change the camera depth of field, there’s nothing like that currently ... but it's definitely a good suggestion that I'll forward on to our Design team.
There is a sort-of work around you could try. It’s not very intuitive and the results are relative (based on user perception).
1. Start the Tour Building Wheel.
2. Click and hold the Forward wedge.
3. Drag the Mouse down.
The slider moves away from the target sphere and, as it goes below the “Start” point on the bar, the field of view should appear wider.
What’s really happening here is the camera is very slowly moving straight back from the target sphere.
I hope this is helpful.
Scott Lillibridge, QA Manager
Extended Design Group
Autodesk, Inc.