And, believe me, I'm an 'easy' reader. I don't stop while I'm reading to look stuff up. I put my faith in the author to be within the realm of reality even in fiction. If you write historical fiction, I'm your reader, because what I know about history would fit in a thimble (does anyone even use those anymore?). So if you tell me the Duke of Wherever was carrying a reticule, I wouldn't flinch.
But if you're writing mystery, I trust that you won't have your character thumb the safety off his Glock, because THAT I do know. (That happens to be the most common mistake concerning firearms that writers make—and I've seen some Big Names make it.)When I was researching Finding Sarah, I wanted to make sure I had the right stars in the night sky when they strolled on the porch after dinner. I spent time with the on line Farmer's Almanac to make sure Randy could point out Cassiopeia to Sarah. As it turned out, I didn't need that scene, but I knew I had it right.