As pointed out, each filter has its own characteristics. Stacking can cause a couple of issues. Vignetting is one. The other is light reflecting off the front surface of the second filter and then reflecting off the back surface of the first one. This can cause halos, or multiple outlines of the subject. Your best bet is to experiment and see what works for you best.
jimcrna wrote:
Hi. I there advantage/disadvantage using these two filters together for outdoor/landscape photos. nikon 7200..either 17-55,2.8 or 24-70,2.8..thx in advance..