Consider a character with a heavy shield (equipped) and a versatile weapon (equipped one-handed). I'd like to know whether they can, in the course of a single turn, forgo the shield and attack with the weapon two-handed; even if it means not having the shield equipped for some time after, or even if there's some other penalty involved.
The Player's Handbook (p289) says that equipping or stowing a shield is a standard action, which rules out stowing the shield and then attacking. The same page also says that dropping "held items" is a free action, but does an equipped shield count? Or is there some other way to achieve this?
Best Answer
Unequipping your shield is a standard action, according to the Rules Compendium's section on Shields (p267):
Unfortunately, this means you won't be able to use a standard action for an attack in the same turn unless you spend an action point.
Once your shield is removed, your options are these:
I'm not aware of any feats to speed up this swap!
Getting the shield back after dropping it
If you do #1, you'll need to recover your shield at some point. Picking something up is a minor action - this does not equip it. Once it's in your hand, it will take a standard action to either stow it away on your back (or somewhere out of the way) or equip it. Being a shield, it seems you can't simply stow it away as easily as other items, which normally take a minor action.
Where is this all from!?
This is sourced from various excerpts from the Rules Compendium's explanation of a Standard Action, particularly these sections:
You should pick up that book, since it contains the most recent version of all of 4e's rules, complete with all errata and updates released since.