need to get a uv filter for my ex1r, whats the size and whats a good brand

77mm. I went with B+W.

B+W 77mm XS-Pro Pro Clear 007M Digital 66-1056702 B&H Photo (http://www.bhphotovideo.com/bnh/controller/home?O=WishList.jsp&A=details&Q=&sku=591176&is=REG)

how does this compare to this one:
B+W 66098703 77mm UV/IR Cut (MRC) Filter

Jim,

I'm using the B+W UV/IR on my EX3 and it works great. I'm not sure if they fixed the IR issue one the EX1R but in most situations it's needed on the EX3 when shooting blacks.

-Garrett

not sure does the ex1r have the ir problem?

The EX1r does not have the IR problem.

thanks les