HELP Different colors Contax MC UV filters

[Guest]

I noticed my multi coated UV filters for my Contax G lenses have different colors. My newest have a deep green coating and some others (some are bought second hand) have a more blue color! What does this mean? Are the ones with the more blue coating deteriorated? Do I have to replace them with new filters? How bad is this? Is it still better then single coated filters?

I don't want to work with bad filters, but I don't want to replace filters that are actually still in good shape, so your input is appreciated!

 

[Guest]

Sander,

different coatings reflect different colors, which not necessarily meens that one is worse than another.

My Contax 1a reflects green while my Leica UVa reflects a magenta color.

Assuming the different filters are all Contax, your observance would prove that they have changed the coating!
AFAIK the Contax filters are not made by Zeiss, but I am not shure if the coating should not be constantly T*?

Perhaps someone else can report on that.

Till

 

[bobbl46]

I remember someone telling me that a microscopic change in the coating thickness will reflect a different colour!

Cheers, Bob.