(shot by D700 + Micro-Nikkor 55mmF/2.8 @f8)
The users of old Nikons can use current Zeiss diopter correction lens made by Cosina.
Actually I use +2 diopter lens from Cosina for this Zeiss finder myself. This photo is
to show that they are compatible with newer BESSAs, ZEISS IKON, and old NIKONs.