Found these filters today but cant find a good review of them. Price is far cheaper then e.g polarpro. Found them to be even better to since you can stack them if you want more effect.
Has anyone tried them? Surprised i couldn't find a review here...
The plastic ones work fine - the downside is that you will likely bend them or scratch them after a bit - so get some extras.
Once you really get the hang of things you can get the glass one if you don't want to fiddle around any longer.