The thing is that it seems a little bit magentas to my eye and a little bit yellowish at the clear side.
It also has the LEE ND.3(6 and 9) S G inscription from LEE at the bottom right hand side and nothing at the other corner.
A filter to be placed in the optical path (thus not just for lighting) must have a smooth surface on boths sides.
Or is there a misunderstanding of your wording?
Maybe you mean a slightest roughness as in emulsion side versus base side at a film-strip (different sheen).
This then may indicate that the filter is made from a dyed-gelatin coated film (there are different methods imaginable of making gelatin filters).
Or you mean that you even can see that it is a sandwhich with one side the fully transparent base and the other side a dyed layer.
Anyway, Lee however make their filters from thoroughly dyed plastic. Thus homogeneous and same sheen on both sides.
Unless LEE abandoned this practice just for their ND filters.
(I only have their colour filters.)
Did anyone expect a loss?Not noticiable changes in sharpness.
As far as I know when using filters, it depends on the quality of it but usually you may get certain loss in definition terms as you are putting a glass or a resin surface in front of the lens. I may be wrong.Did anyone expect a loss?
You did not say whether your filters have the density as designated.
By the way, only just now I realized what you mean by "clear" side. Please think about your terminology. Your filters are clear all-over.
You made a good point. I already realized that cinematographers and still photographer use different terminology.-
Concerning that colour cast, the best explanation to me is light fading. But such filters are typically stored away. And following that fake theory, one might think that just cheap gradation filters at hand got fake designations. But would someone buy those then with that cast? Well, you did...
But I assume you knew beforehand. I myself bought a lot of "junk", but at price I thought a bargain for what I thought that stuff would nevertheless be useful for.
If it was that way I think It should have some kind of labeling according to that.Could these be intended as combination gradient and warming filters?
I have found this article on Haida´s website where a photographer makes a review and compare a new haida filter with his old lee filters. He said the next:
Compared to my Lee 0.9 soft grad resin filter, the Haida Red-Diamond glass filter does not exhibit any colour casts at first glance, whereas the brownish cast on the Lee filter is very apparent from the photo above. That said, I have been using my Lee filter for years, and the brownish discolouration could be due to age. The use of glass as opposed to resin for Haida's filter products should also yield a more resilient filter which should not discolour with age.
Article link: https://www.haidaphoto.com/en/evaluation001-313.html
Again, I strongly suspect the "Lee" filter in this image is a fake. Look how far from the corner the model lettering is compared with the two genuine examples I posted.
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