If we see towards the galactic center and then we are not able to see the red shift and blue shift that means that the galaxy are not gravitationally lensed.
Some distant galaxies are gravitationally lensed. Some nearby galaxies are attracted to us because of the mass of the Milky Way. Some nearby galaxies have vigorous star formation and are much bluer than others. The concept of redshift and blueshift is closely related to the Doppler effect — which is an apparent shift in soundwave frequency for observers depending on whether the source is approaching or moving away from them. Observers looking at an object that is moving away from them see light that has a longer wavelength than it had when it was emitted (a redshift), while observers looking at an approaching source see light that is shifted to shorter wavelength (a blueshift).
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