There is no dispute about quasar redshifts and the Wolf effect has not been used to suggest that quasars might not be at cosmological distances unless ScienceApologist has a source verifying his statement What some researchers of the Wolf effect have said is in the last quote of the article  we note the possibility that correlationinduced spectral shifts may contribute to the shifts observed in the spectra of some astronomical objects such as quasars  James also writes  our results do demonstrate the plausibility of the existence of extragalactic objects with discordant redshifts due to well established physical phenomena  It should be emphasized that our theory is based entirely on established principles of optics no hypothetical new physics was introduced Furthermore certain aspects of the underlying phenomenon the Wolf effect have been tested extensively in the laboratory