This is the only short telephoto lens made by CZJ, called PANCOLAR in M42 mount.
5 grp / 6 elm, MFD = 0.65m, filer size = ∅52mm, 340g
$250 @2000, $250 @2005, $120 @2007

This lens' internal structure is almost identical to its smaller
brother the first version Prakticar 50mmF/1.8 (Pancolar one).

Short MFDs of 80~90mm lenses I own:
ALPA Tele-Xenar 90mmF/3.5 ... 0.61m
Prakticar 80mmF/1.8 .................. 0.65m
Elmarit-R 90mmF/2.8 ................ 0.69m
Zuiko Auto-T 100mmF/2 ........... 0.70m
Varisoft Rokkor 85mmF/2.8 ..... 0.80m
Pancolar 80mmF/1.8 .................... 0.83m