(shot by D700 + Ai Micro-Nikkor 55mmF/2.8S @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 new NIKONs.
Nikons are from F3 and up, also dSLRs but not Z-series cameras (Z9's might be OK?)