I present to the world, the Frankensteintax. See my previous flower images to see the results of this collision.
[read this: Some other people have tried this. You absolutely need a camera which has the lens on a track, and not a flip up mechanism!]
It is simply what you see here, nothing more. I have used simple elastics and some basswood to achieve this with a 1917 Series III Kodak 127 camera. I am planning a more permanent design with a proper Pentax adapter ring. There's absolutely no reason to do this but simply to take over the world.
How is this even possible:
The Pentax is run in manual mode and takes care of the shutter and film speed while the aperture is controlled by the antique lens. The antique lens, thankfully, is not moldy, and has a full shutter open mode called T which is kept open while shooting.
The position of the antique lens on the track pictured here is excellent for Macro since the sensor is a subset of the original projection. Fully unfolded, the lens is about 140-160mm literal (originally 120). For landscapes, the lens needs to be moved back on its track to about 35-50mm, which brings it back closer to it's prime, where a larger subset of the projection is cast onto the sensor. Once the lens is placed about where the subject matter wants it, the old focus spinner still functions. I need to take a field notebook out and also mark findings along the bellows track with tick marks.
If you really want the nerdy explanation (you've been warned about the nerdyness) go here.
The old view finder still works. You can hold the camera against your chest to look down into it and snap the photo. It's really very fun.
Neither camera was harmed and lightning bolts were not used. I believe it may be also be a time machine.