lenses

[mohamed el masry]

hi

i have 6 lenses carl zeiss (18,25,35mm distagon)T 1.4

(50,85mm planar)and (25_250 zoom)T 1.4

But the problem is that these lenses have been converted to BNCR mount

This is their own photos. Please give me the solution.

Note: Are there any special problems in the back focal length after adapter

thank you