im looking to get some uv filters, but how do i know
Emma - hi and welcome to TP
NONE of these comments are harsh ok ...?....
there has been endless threads about UV filters ...suggest you do a search through the forum
ok - why do you think you need a UV filter..?
1...to filter UV ?. - no - that's a throwback to film days
all modern digital sensors already have a built-in UV filter
2.. to provide some degree of protection for the front end of your lens ..?
so fit a "Protection" clear glass filter ....

BUT any glass in front of your technical designed lens WILL cause a degradation of the image...and here's where all the opinions start
cheap filters WILL causes problems - flares etc
expensive filters [Hoya HD series] to a much lesser extent
so some people only fit a protector in a hostile environment - car rally, sand etc
other dont, and rely on a lens hood, then replace the lens cap when finished
it's really up to you, but it's not as vital as you may think
AND lots will have completely different opinions..........
the front of my Sigma 17-70mm is rather exposed
I purchased a Marumi DHG Protector - cannot see any degradation and it gives me peace of mind.