Here is an “Imperial” Carte-de-visite by Mathew Brady’s New York studio. It’s called an “imperial” because it is the size of what later came to be called a cabinet card (roughly 4 1/2 x 6 inches), whereas typical carte-de-visites are 2 1/2 x 4-ish (roughly the size of a modern business card).
Whoever this gentleman was, he’s obviously quite dapper and very fashionable. I’m sure he’s someone famous and important, but I don’t know Victorian American personalities as well as I should. As a photographer, I’m wondering if either this was made with the same camera and lens as was used for the smaller images, or if this was shot by Brady himself instead of one of his assistants, because the depth of field is so shallow that at this size, his hand and leg closest to the camera are obviously out of focus. If this was shot by Brady himself, perhaps his eyesight was bad enough at this point that he didn’t realize the hand and knee were out of focus. If that was not the case, then it’s possible the fault lies with the lens – when you focus anything closer, the depth of what is in sharp focus in the image decreases. In order to project an image roughly 4 times the size using the same lens, you have to focus much closer and the depth of field will be noticeably shallower.
If anyone out there has an opinion or better yet some historical fact to prove/disprove either or both possibilities, I’d greatly appreciate hearing from you.