albertri
Senior Member
The only thing we can know for sure is that the Sony filters are designed by Zeiss and uses Zeiss's proprietary T* coating.
A comment from another forum:
"They even look physically the same and come in the same neat clamshell style case, though Zeiss announced its version in 2010 and Alpha branded versions were available long before that. I'm guessing Zeiss saw the opportunity to make some money by selling them in other sizes, though only offers "POL" and UV whereas Sony only offers CPL, ND and MC (clear protector) no UV as it's not relevant to digital sensors."
thanks bro for the info
