In accordance with the formula:

(frequency) = (speed of light)/(wavelength)

if there is redshift and you wish the speed of light to remain
constant (Divine Albert has said it is constant), you should STRETCH
THE WAVELENGTH. So for a century Einsteinians have been fiercely
stretching the wavelength no matter what type of redshift is measured:

http://curious.astro.cornell.edu/que...php?number=278
"In both cases, the light emitted by one body and received by the
other will be "redshifted" - i.e. its wavelength will be stretched, so
the color of the light is more towards the red end of the spectrum.
But there's a subtle difference, which you sort of allude to. In fact,
only in the first case (a nearby body moving away from the earth) is
the redshift caused by the Doppler effect. You've experienced the
Doppler effect if you've ever had a train go past you and heard the
whistle go to a lower pitch (corresponding to a longer wavelength for
the sound wave) as the train moves away. The Doppler effect can happen
for light waves too (though it can't be properly understood without
knowing special relativity). It turns out that just like for sound
waves, the wavelength of light emitted by an object that is moving
away from you is longer when you measure it than it is when measured
in the rest frame of the emitting object. In the case of distant
objects where the expansion of the universe becomes an important
factor, the redshift is referred to as the "cosmological redshift" and
it is due to an entirely different effect. According to general
relativity, the expansion of the universe does not consist of objects
actually moving away from each other - rather, the space between these
objects stretches. Any light moving through that space will also be
stretched, and its wavelength will increase - i.e. be redshifted.
(This is a special case of a more general phenomenon known as the
"gravitational redshift" which describes how gravity's effect on
spacetime changes the wavelength of light moving through that
spacetime. The classic example of the gravitational redshift has been
observed on the earth; if you shine a light up to a tower and measure
its wavelength when it is received as compared to its wavelength when
emitted, you find that the wavelength has increased, and this is due
to the fact that the gravitational field of the earth is stronger the
closer you get to its surface, causing time to pass slower - or, if
you like, to be "stretched" - near the surface and thereby affecting
the frequency and hence the wavelength of the light.) Practically
speaking, the difference between the two (Doppler redshift and
cosmological redshift) is this: in the case of a Doppler shift, the
only thing that matters is the relative velocity of the emitting
object when the light is emitted compared to that of the receiving
object when the light is received. After the light is emitted, it
doesn't matter what happens to the emitting object - it won't affect
the wavelength of the light that is received. In the case of the
cosmological redshift, however, the emitting object is expanding along
with the rest of the universe, and if the rate of expansion changes
between the time the light is emitted and the time it is received,
that will affect the received wavelength. Basically, the cosmological
redshift is a measure of the total "stretching" that the universe has
undergone between the time the light was emitted and the time it was
received."

Are Einsteiniana's idiocies, "stretching the wavelength" in
particular, eternal?"

Pentcho Valev