I just got a polarising filter (Hoya Pro 1) for my new Canon EOS 500D. (Actually, I had intended to buy a filter for protection i.e. UV filter, but obviously didn't do enough homework. ) Anyway, I was playing around with it and taking some snow pics. Cos' I read it's also good for cutting out reflection from snow?
When I came back and viewed the pics, I realized the corners in some of them are dark. Then, I didn't know much about vignetting, so I read up and realized it seems to occur when using a CPL on wide angle shots? To that, I have some questions that hopefully dear all can help to clarify.
I assumed most people would use a CPL for landscape shots since it's supposed to increase colour saturation of skies, water etc. And most landscape shots would be taken in wide angle or using wide angle lens, right? So, if CPL causes vignetting in wide angle shots, why do people still use it? Is there any way to rectify the problem? I hope I'm making sense here. Please correct me if I'm wrong.
On top of the vignetting in my wide angle shot (Pic 1 below), it also seems to occur in a zoomed-in photo (Pic 2). Why is that so? But I realised in a wider-angle view of Pic 2, there's no vignetting (Pic 3). Why why?
I have more questions pertaining to snow white balance and referring to the same photos. But I guess it's more appropriate to post it as a new thread under a different heading.
Please feel free to comment on the photos, criticize, tear it apart, anything.
Btw, all photos were taken with EF-S 18-135mm 3.5-5.6 lens.
Focal length=18mm, f/8
Focal length=92mm, f/8
Focal length=50mm, f/8