Mark Shea's " excellent and well-researched blog-post"....

...well, so said a comment left on Mr. Shea's recent: The Immaculate Conception: Enter the Subtle Doctor: Duns Scotus. Unfortunately, Mr. Shea keeps repeating the same bogus stuff about Luther:

After this, there wasn’t much of a quarrel in the Church. Most people happily celebrated the Feast of the Immaculate Conception (promulgated in 1476) and the controversy died down (although there were holdouts among some Dominicans, who stuck with Thomas’ theology on Mary’s holiness right up until 1854). But for the average Catholic it was a settled matter that the Church had arrived at a clearer understanding of Scripture by seeing just how full of charis Mary really was when the mysterious angelic greeting “Kaire, Kecharitomene!” gave her a title as pregnant with meaning as her womb (Luke 1:28). Indeed, even early Reformers like Martin Luther had no problem with the doctrine:

It is a sweet and pious belief that the infusion of Mary’s soul was effected without original sin; so that in the very infusion of her soul she was also purified from original sin and adorned with God’s gifts, receiving a pure soul infused by God; thus from the first moment she began to live she was free from all sin. (Martin Luther, “Sermon on the Day of the Conception of the Mother of God,” 1527)

It really is amazing how self-proclaimed e-pologists put out stuff they've never actually bothered to look up.