You're still right though, - mixing the two types would be tough in most cases... If the photograph is of a far horizon, or things distant, and are blurred a bit to make sure it stays that way (and to introduce some digital aspects to that picture), then you can pull it off. Medium to short-distance photos with no interposing 'glass' between it and your subject are extremely tough to make convincing, at least without a ton of post-work... I wouldn't even think to try it meself :) /P