5dM4 work with Circular polarizing filter ? special instruction

[hlee703]

I tried two CPL  filters, the filter are good, but nothing happen/change on the live view image?

[ebiggs1]

Way more info needed!

[Waddizzle]

Try aiming the camera at a flat screen TV that has been turned on.

I agree.  More info is needed.  Are you shooting stills or video?  Indoor or outdoors?  Focal lengths?  Any artificial lighting?  Etc.

Why Live View?  What happens when you use the OVF?

Try to provide enough info so that someone can try to reproduce your results.  Help someone to help you.