Camera face down... losen lens cap (get ready), remove camera mount cap, remove lens cap.. mount lens. You do not want dust to go into the back of the lens either... action must be fast Just like stripping M16
Got a crazy idea here... I think the use of the idea of microscope is interesting! Wedding photographers no longer need two bodies (one tele, one wide)... You can prepare 3 lens before hand, then no need to worry about changing your lens... You "change" between them within seconds!
Change between a telezoom, wide and a prime lens!
To think of putting it on a camera, it's gonna be bulky, heavy and definitely looks very weird!!!
I am NOT a PROfessional photographer and photography is NOT my hobby
interesting but haha, we can drop the idea.
Sort of like the Kodak Easyshare with 2 lenses- one wide angle and one zoom...
Anyway, like some says, just change the lens quickly. There is no need to worry so much about the dust.
If so worried, then get those P&S or DSLR like with fixed lenses. Then again, dust will still get in when you zoom.
"Photography is an austere and blazing poetry of the real" -Ansel Adams