Yea thanks. I found a couple that specifically state they are meant for the GoPro but I am wondering if one filter is better than another. I was looking at this one, http://cgi.ebay.com/NEUTRAL-DENSITY-FILTER-DISK-4-HERO-GOPRO-1080P-GO-PRO-/350327992137?cmd=ViewItem&pt=Camera_Filters&hash=item51912cef49 and it states it is 23mm. Will buying a higher end filter, if this isn't already, make a huge overall difference ?
Thanks