30 and a half ounces if we go by the Canon versions which Danny was referring to.

To put that in perspective that is more than the total weight of my camera body a Canon 30D and more than the weight of a Canon 5D.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html