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Focal length calculator
Radius 1
mm
mm
cm
m
in
ft
Radius 2
mm
mm
cm
m
in
ft
Center thickness t
C
mm
um
mm
cm
m
in
ft
Refractive index n
Lens material
-
B270
CaF2
Corning HPFS 7980 FS
Corning Pyrex 7740
Fused silica
Germanium
N-BAF10
N-BAK1
N-BAL35
N-BASF64
N-BK7
N-LASF9
N-SF5
N-SF10
N-SF11
Effective focal length f
eff
mm
um
mm
cm
m
in
ft
Front focal length FFL
mm
um
mm
cm
m
in
ft
Back focal length BFL
mm
um
mm
cm
m
in
ft
Primary principle point
mm
um
mm
cm
m
in
ft
Second principle point
mm
um
mm
cm
m
in
ft
Nodal shift
mm
um
mm
cm
m
in
ft
Lens diameter D
L
mm
um
mm
cm
m
in
ft
Edge thickness t
E
mm
um
mm
cm
m
in
ft
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