just aquired this lens and would like a filter , mainly to protect it, but any suggestions / advice appreciated!
mainly shooting plants, insects and fish (through glass).
thanks folks
Why not just use the lens hood? You get a lot of working distance with that lens, so little chance of anything making contact.
I have the Sigma 150 and a CPL that will fit, but to be honest I have hardly ever used it. I hope you get to be as happy with yours as I am with mine - it's a cracking lens