Is this very cheap UV and Polarising filter worth buying?

I've bought a Nikon D3100 as a first DSLR to start getting into photography. I've heard that it's advisable to get UV and Polarising filters as basic kit to enhance my images and protect the lense. I had a shop around and found a really cheap set of both for only £9.99 which is a lot cheaper than most seem to be: http://www.amazon.co.uk/...001GCVEV0/

What could be wrong with these and on the description it says suitable for all Auto-Focus video, still, digital and film cameras. Does this mean I won't be able to use manual focus with them?

Or should I snap up this bargain straight away?

That's awfully. Cheap (and not the brand I have seen before).By putting that in front of your fine Nikon lens, it's like the weakest link.

Get the Nikon filters for your lens would be the best option. Other fine brands are available, too, by the way, but not this one.

You would still be able to manually focus with these filters. Would I buy them? Nope, not even with your money.

When it come to certain photography items (such as filters, lenses, and tripods), I'm a firm believer in "you get what you pay for".

A lot of the cheaper filters use a plastic lens instead of glass (and the cheaper glass ones may not be properly ground). This can result in photo degradation due to blurring and aberration. I prefer Tiffen, Hoya, and Cokin filters.