boojum
Ignoble Miscreant
I am only familiar with what I have, an ELC coated LTM mount, f-stops. The coating is blue and has held up well. I would think that t-stop lenses were made for movie cameras?
T-stops were on the early Fotons, then both T and F and then, finally, F. T-stops are apparently better but too confusing for still camera folks. Regardless the lens is reputed to be quite good. The tones are very attractive to me and the shading also. But I like the lens. I guess you do, too, as you have had it a while. I do think the ELC coating is desirable. Hopefully I am right.