All opinions, of course, are subjective. Facts are objective, but may still be false, by accident or intention.
Apart from revelation, our ability to identify the objective is limited by the fact that we perceive it through our senses, which are unique to each one of us.
For example, you and I may be say, “She’s wearing a red dress,” but can we be sure we mean the same thing by “red”? Neither of us knows exactly what view the other describes with the label “red.”
And only spectrophotometry can supply the ontological data.