[Leica] Filters for the 19/2.8 R (to protect)

[jsaravia@zeus.uniandes.edu.co]

Dear Lugers:

I know this topic has been on before but I missed it. I am looking for a
19/2.8 R lens, but what worries me is that it is not possible to use a
filter in front of the lens to protect it. Since I will be using the lens
during mountain climbing (you know, wind, ice, snow, dirt,....) I will like
to know if some one is the list has been able to adapt some filter in front
of the lens ???? if so how ?.... (I am aware of the optical problems that
may arise when a  filter is placed in front of a Leica Lens, but this is a
matter of protecting the lens).

Thanks in advance

Jorge Saravia