I don't believe it's possible for work to be "moral" or "immoral" without a surrounding context. An image itself can't mean anything, can't convey a truth (alleged, sincere, deliberately falsified)—or an intention—without some kind of contextual frame around it. Therefore it's the use of an image, not the image itself, which can be seen to have moral content.
I can't imagine how the film format or type of camera could be an important part of that discussion.
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