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A photon is said to lose energy as it climbs a gravitational field. And it will also be detected as red-shifted by you observing.So, did it?How?
An interesting point Mike, but time dilation for a photon causing it to be a lower frequency is a loss of energy. A massive object slows down and loses energy too but its rest mass energy does not change. It is just two alternative ways of expressing the same thing. Frequency and time are inextricably linked.