A polarizer only has effect on sky color at 90Â° angles from the sun, or basically in N & S directions. Wide angle lenses 28mm or less, have a 70Â° angle or greater, thus you will have at least 20Â° each side of center not effected. This is true of any filter, at any price.
Polarizer's can reduce reflections from non-metallic objects in any direction, but have the most effect at 30Â° angles or shallower from the object. You cannot use a â€œLinear Polarizerâ€ on a digital camera, it will affect both your auto focus, and TTL metering.
No photo editor even Adobe, can successfully imitate the true effects of a polarizing filter.