This thought tortured me for a while now, and I can't find if this has been hypothesized/discussed before, and if so, is there a consensus: Can redshift be to at least some degree a result of a dispersion of light (chromatic aberration) caused by a gravitational lensing? If my understanding is correct, this would correlate to observed increased redshift rate with increase of distance from observed light source - larger distance generally would allow more occurrences of gravitational lensing due to generally larger amount of mass on/near the path required to reach the observer. Assumption I make - dispersion (chromatic aberration) caused by a gravitational lensing a)must exist, and b)must be of a similar nature to a dispersion in prism/optical lens - longer wavelength retain original direction better compared to shorter wavelengths, and shorter wavelengths are dispersed at a higher rates, thus observer perceives a red-shifted image.
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Gravitational lensing does not generally cause dispersion, see the questions and answers here Does gravitational lensing bend light of all wavelengths by the same amount?. Therefore, no this is not an effect to consider.
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