Thank you Nodda Duma!
Some of you already know this film. From 18:00 the lens coating is described.... The lumenizing method described as hard C
coating using Magnesium Flouride (as mentioned by Nodda Duma in the previous post).
https://youtu.be/tpziDTklPs0
In the meantime, the lens I purchased (mentioned at the beginning of the thread) has arrived. On the back of the lens, small speckles are partially visible under certain angles of view. They are bluish purple in color. They cannot be cleaned. I asked the seller if these might be spots on a coating. He answered in the affirmative and assured me that it does not affect the image quality (he has used the lens himself). ....
I would like to believe him. Held up to the light, you can see practically nothing except at the very edge something like light traces of cleaning.
What do you think?
So can this be a subsequently coated glass?
Or is it a factory (almost invisible) coating?
Or do the speckles have another origin?
I still need to make myself a lensboard to test the lens....
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