Flip Mirror question

[buzz5]

I have a Celestron C9.25, now I have a choice in Flip mirror's which I wish to purchase one of.

Meade 1.25 inch Flip Mirror

Meade 2 inch Flip Mirror

Are both compatible?, i.e. will the 2" fit on C9 ok, and is there any advantage? i.e. It says it can attach 2" eyepieces as well as 1.25", so will the field of view be better for astrophotography.

also would I need the Meade 1.25 inch adaptor for Flip Mirror ?

lloking at page: http://www.telescopeplanet.co.uk/ProductListing.asp?cat_name=Flip%20Mirror%20--%20Astrophotography%20&cat_code=34&subcat_code=252

Thanks,

Buzz