Helios 44-2 for Nikon F! Vzácný!

This is unique piece for experts only.
Helios 44-2 MECHANICALLY modied to fit on Nikon F with infinity focus.
No additional lenses or inverted rear element; This preserves all its optical quality.
Fully serviced, glass clean, focur ring so smooth that moves with 1 finger.
Very sharp sample in the centre of the frame even at full aperture.
Filter thread slightly bent, filter installation is not possible.
Finely modified to have hard stop at infinity, correct distance scale, and indication numbers facing up.
Tested on D750, I cannot confirm mirror clearance for other cameras.
Avilable in Praha 1, I can ship.
With original front cap.