Quote Originally Posted by pmr
I want an ultra-compact digital camera. I have narrowed it to the Pentax Optio X and the Casio ex-z50 or z-40. I need your help to choose which one you like better. Please give your opinion.
FWIW, I'm pretty sure that the Casios are rebranded Pentax cameras. I know the lenses at least are Pentax.

Take a look at the reviews on http://www.dpreview.com for technical information.