Photography: Camera sensor size difference

filters aren't all made the same. cheaper ones have lower quality coatings and are not multi coated.
the only one's i own are resin Lee nd-grads and a polariser (these weren't cheap about £60-£90 each) that are quite large to fit over large and medium format lenses. being resin they aren't coated but i use them with a bellows hood.
and some specialist filters 93mm diameter to fit my h/blad 40mm made by B&W
and loads of 75x75 cc, cto, ctb, nd and fl-d gel filters by kodak/lee for colour correcting different batches of film (halceyon days)

Cheers for the info !

those filters in the link seem very cheap? are they single coated? if you use a good lenshood or matte box then multi coating probably essential.
as for skylight filters i always find they caused flare and have never bothered with them and don't know anyone who does.

Matte box !? I am going 'bareback' (new photography term I just made up, write it down) - No lens hood or matte box for me, I like nothing more than flare and glare, you are talking to someone who puts fake chromatic aberration into his videos. :)