Thank you Peter
I think i understand.
There are two sets of lenses, both glued together.
if I look at them from the side they consist of a tich and a thin lens.
that was what I ment with vide and narow.
if I understand you correct the two thin ( most convex) shoud face each other.
it also look correct by markings from the retaning ring on the outher lens.

so once again, thank you

JSNE