Proper Frequency

I know there is such a thing as proper length and proper time for an
object like a rod, but for an electromagnetic wave is there such a
thing as proper frequency and proper wavelength?

Obviouslly, a red-shifted light wave is going to have a frequency that
appears lower because the growing amount of space in between, but is
there a "proper" frequency for the light, that represents its frequency
indepedent of the doppler shift?

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