Automatically change focal length

  • I have these focal length conversion factors, I need to put them in the code so that they do the automatic conversion. How should I do?

    Medio formato = 0.79-0.84x
Full frame 35mm = 1.0x
APS-H  (Canon)= 1.3x
APS-C  general (Nikon-Sony-Pentax) = 1.5x
APS-C  (Canon)= 1.6x
4/3” = 2.0x
1” = 2.7x
2/3” = 3.9x
1/1.7” = 4.5x
1/1.8” = 4.8x
1/2.3” = 5.6x 
1/2.5” = 6.0x
1/2.7” = 6.4x
1/3.0” = 7.2x
1/3.2” = 7.6x
1/3.6” = 8.6x
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