Is UV filter necessary while using C-PLfor the lens?

I'm new to photography,
I own a Nikon d5100,
I have a rookie question,
Is it necessary to also use an uv filter when you use C-PL for the lens.
I use a marumi c-pl filter for my 18-55mm lens, it also gives black edges to the picture sometimes,.

Kindly suggest.
I

UV filters are never necessary and are a complete waste of money. Your camera already has a UV filter covering the image sensor.

You do not need a UV filter, your camera has one built-in.
Dark edges could be a property of the filter. I have no experience with Marumi filters, so I don't know how good they are or how they are designed. If you stack filters it may create a vignette with a wide angle lens. If a filter is very deep in design or the lens is very wide a single filter may create a vignette.

You don't really need a UV filter on a DSLR, most are just used as lens protectors to be honest. So if you are already using a C-PL (circular polarizing) filter there's absolutely no need to use a UV filter too!

*Black edges can be an effect of using multiple filters!

No you don't need the UV when using a polariser… Stacking filters often leads to vignetting (dark edges) particularly with wider angle lenses.

I would tell you to use the uv filter all time. As screwing another one onto it will make total filter width thicker when your zoom is in wide angle, ok, then remove the uv when using the pl to avoid vignetting

Nope, they really aren't necessary when you're shooting digital.

I have a UV filter for each of my lenses because I shoot a lot of film. The *only* time I use a UV filter on a lens with my Nikon D90 is when I'm visiting my parents and it's windy out. They live in the middle of the desert where there's tons of blowing dust. I'd rather have to clean it off the UV filter than the lens element. I don't worry about how the UV filter affects my image quality very much because most of the shooting I do there's just family snapshots.