It seems that all those companys are not good at caring for customers.
stellrings seems awfull
no answer from kipon ( and the worst website on earth )
...
thanks for your answer !
flocking is really important, i used to have a tilt and shift adapter that was really well built, but so much flare due to bad internal reflexion...
i don't trust Fotodiox... really bad QC !
and i just use Apple computers till 1995... "AT This time only PC will work with this firmware, we are actively working to try to fix this for MAC OS ".
Maybe i will go with the kipon and ad flocking myself !