## Lamb's (1995) photopigment template

### Template equation

Equation 2' from Lamb (1995), where *S(**λ)* is the spectral
sensitivity, lambda is the wavelength in nm, and *λ*_{max} is the
wavelength of peak sensitivity in nm. *A *=
0.880, *B *= 0.924, *C *= 1.104, *D *= 0.655, *a *= 70, *b *= 28.5, and *c *= -14.1. This equation
produces a fixed template shape on a log wavelength, log frequency, or
normalized frequency scalein
accordance with Mansfield's (1985) proposal.

### References

Lamb, T. D. (1995). Photoreceptor spectral
sensitivities: common shape in the long-wavelength region. *Vision Research,
35*, 3083-3091.

Mansfield, R. J. W. (1985). Primate photopigments
and cone mechanisms. In A. Fein, & J. S. Levine (Ed.), *The visual system*
New York: Alan R. Liss.