I'm not exactly saying they equate photographically, rather that it would not be possible to have a smaller aperture because their physical size equates.
Good point misha a tripod [or somewhere to rest the camera] is essential if you do use a long shutter speed.

Message edited on: 03/31/2006 09:52

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