as I am using more and more the Leica M9, I decided to keep the M8 and try some infrared photography with it.

Any advices are welcome, I have just received this Heliopan 830 filter, wich is a true IR filter (block all visible light).

Can I use it in color (I guess no, but...) ?
Is it just for BW IR ?
How to focus with the rangefinder for IR ?

I have ordered a 39mm wich I want to use with the 50 cron , 35 cron, and 28 elmarit ...any suggestions are welcome.

My principal us is for landscape (seaside and blue sky).