Why would a photon in the field you describe experience redshift?

Time experience is slower in gravity field. Light should experience a red shift. I guess I suspect that because something is needed to cause the time experience of matter to be slower.

I do not know how mainstream theory treats ambient gravity? I suspect that no one has really looked into it deeply. I have two unanswered questions. I'm searching for the answers.

Questions:

(1) Is there even such a thing as ambient gravity? For example, do opposing gravity fields simply cancel where the fields overlap, or is there a non-directional ambient gravity that still affects clocks and stuff in the field. I suspect that there is ambient gravity.

(2) Is time dilation experienced in a static gravity field? I think mainstream theory is that this is true. I suspect that experiment has already shown that this is true with the GPS satellites. I suspect that where there is time dilation there is also a gradual accumulative red shift. I suspect the arithmetic of GR can show this. But I have not seen it demonstrated.

It seems I remember that the amplitude of the CMBR radiation was first predicted to be on the order of 50 K and only became 3.5 K after it was measured. I also remember that Sir Arthur Eddington and a group of his collaborators predicted that the temperature of space should be about 4 K due to the warming of space debris by starlight.

From UCLA