Entrance Pupil Calculator  
Measurement Position  
1 2  
Wall Distance (X)  
Top (T)  
Bottom (B)  
Entrance Pupil (K)  
Field Of View (FOV)  
Focal Length  
Flange Distance  
Lens Length  
EP From Flange  
RRS Nodal Rail  
Nodal Ninja  
1. All measurements are in millimeters.  
2. The default values are for Zeiss Loxia 21 mm.  
3. Lens parameter tolerances are at least +/-5%.  
4. RRS and Nodal Ninja calculations are camera specific.