I think this is a 4x5 but maybe it's a 5x7 with a 4x5 back? I don't really know for sure. If it's not a 5x7 then it's a really huge 4x5 body let me tell you. Folks this is an old camera. But it's functional. I do not have the rear extension tailboard. But tell me do you need one? No, no you don't. Not unless you're shooting a very large lens and if you were why would you use an old field camera when there are modern monorails that can support heavy glass much better than a field camera. That said this camera is functional. The bellows are stiff and non-supple but hey, who cares! It's not like you need them to be. The Koronas all had stiff bellows and this is no exception. See the lens on there? Not included. It's an enlarger lens I'll never use. If you really really want it because you see it in the photos and think it's a rip off if I take it away then fine I will leave it there and you can have a free enlarger lens with no shutter! See how well you can use it! Joking aside this is a decent camera. I have three lens boards for it. If you're a youngster just getting started and looking for your cheapest way to get on board with 4x5, then you're looking at it! How does $100 plus shipping sound? If that sounds like it's not such a great deal but you're still interested in the camera, then by all means send me an offer! Offers will be considered!