Samsung Schneider D-XENON 100 Macro - Manual (Page 6)

《4》
Focusing ring Front-ring threads Distance scale
Aperture ring
Depth-of-field scale
Aperture-A-lock button
Schneider D-XENON LENS
NOTE :
Aperture settings are controlled automatically as if set to the auto "A" position, so
accessories without an auto "A" setting cannot be used with these lenses.