Polarizer filter for Sigma 30mm

My philosophy, when it comes to filters, is to look at the range and buy one that isn't' at the top or the bottom of the range. The cheap ones are probably not very good and the top ones might be overpriced (although that's an unfair generalization).

I would suggest a good brand name like Hoya.

 

I don't pretend to know all about the multi-coatings on these filters. I do know that B&W is a top end brand that is expensive but said to be quite good.

Maybe it's a good idea to just buy a good one, and then never have to upgrade.

Also, I would suggest buying a larger filter. You can buy a step up ring and use a larger filter on a smaller lens...but if your filter is too small (if you get a bigger lens) would won't want to use a step down ring as it may cause vignetting.

The slim filters are for wide angle lenses or for when you stack filters. Non-slim filters may stick out far enough to cause vignetting on some lenses. Probably not required for the Sigma 30mm.

 

Good point...but you may not want to use the hood with a polarizing filter anyway because it would make adjustment of the filter rather hard.

Of course, you could use a screw mount hood, attached to the filter.

 

I have several lenses with the bayonet mounting style hoods (including the Sigma 30mm F1.4). I do like that they hood can be reverse mounted onto the lens...because the alternative would be to make extra room for them in my bag...they might get left at home.

The problem, of course, is that when you have a filter like a polarizer, it can be hard to rotate the filter with the hood on.

Come to think of it....I don't think I've ever used a polarizer on my Sigma. This is a lens that I use indoors or for portraits, not for landscapes etc.

With my main landscape lens, the 10-22mm, I do have a hood...but because of the extreme wide angle of view, the hood's diameter is practically double the diameter of the lens and it doesn't stick out very far either. It's sort of ridiculous for blocking light...but it does provide some physical protection. The point is, with that lens, there is no problem at all about being able to reach the filter with the hood on.