Multiple filters?

[Renlio]

on my DSLR i always have an UV filter as a protector for the lens, if i were to use a Circular Polarizer Filter, would it be more effective to take the UV filter off?
and should i only use one type of filter at a time?
thanks.

 

[unofficialPete]

Stacking filters could cause IQ loss, affect auto focus and increase the risk of flaring.

 

[Marky_]

I always forget to take my polarizer off. I find it causes minor vignetting.

 

[Renlio]

i did find it a bit harder to auto focus.
nice one, will keep to one filter at a time.