This is from Leica calibration certificate
https://leica-geosystems.com/products/airborne-systems/leica-citymapper-26.5 Estimation Results for Forward Camera
View Direction Forward
Radiometric Calibration Date 20.06.2020
Geometric Calibration Date 24.08.2020
Geometric Calibration File
MFC150_GEO_CH-S150015-A-891059_LENS-189012-A-918064_20200824-121350.xml
IMU Misalignment [degree]
ω 0.55168
Φ -0.03595
κ 0.12981
Red Green Blue
Calibrated Focal Length [mm] c 181.035 181.035 181.035
Principal Point [mm] x 0.00120 0.00120 0.00120
y 0.00208 0.00208 0.00208
Radial Symmetric Distortion a0 2.597348E-05 2.597348E-05 2.597348E-05
a1 7.996028E-09 7.996028E-09 7.996028E-09
a2 -9.347627E-13 -9.347627E-13 -9.347627E-13
6.5.1 Specifications for output image Value
Nominal Focal Length [mm] 189.000
Pixel size [mm] 0.00376
Rows [pixels] 10640
Columns [pixels] 14192
Nominal Principal Point x [mm] 0.00000
Nominal Principal Point y [mm] 0.00000
as you can see the nominal focal lenght for forward camera is 189mm... nothing strange for me