I plan to buy at least one polarising filter for improved control in landscape and outdoor photography. There is a huge choice, at a wide variety or price points, from Canon's at £150 plus, down to stuff at a few pounds (which I certainly wouldn't buy). I'm not a professional photographer, but I do like to get the best shots I can with the equipment I have (Canon 600D, SIGMA 17-70 f2.8 - f4 (likely to be my main landscape lens), and a Tamron 70-300 f4-f5.6)
Can anyone suggest what price / manufacturers would fit the bill. I know that you get what you pay for, but sometimes there isn't a significant difference from top to middle. I guess I would be looking for a "thin" filter to minimise vignetting?