Double exposure in camera?

I recently received the excellent annual 'wildlife photographer of the year' book and whilst looking through it, noted that a couple of the pictures were taken with what was described as "in camera double exposure". Any idea how this is possible? Admittidly these were Nikon images, but is such a think possible on any Canon DSLR? Back in film days it was easy, just stop the film winding and reexposure, but slightly lost how I can acheive a single raw file by effectively double exposing - in the case of the examples shown with half the exposure in sharp focus and half not...

Thanks!

You can't. At least not with Canon. Multiple shots combined in post is the only way I know of.

Photoshop pretty much took away the need to do it in camera. As you note you cant do it in canon cameras right now, unless you create your own external shutter (vignette system) and lock the shutter open, but what would be the point when you can so easily merge images in post processing?

gonzogolf wrote in post #13836852
Photoshop pretty much took away the need to do it in camera. As you note you cant do it in canon cameras right now, unless you create your own external shutter (vignette system) and lock the shutter open, but what would be the point when you can so easily merge images in post processing?

What might be the point is that the rules may stipulate that combining of images in (for e.g.) photoshop is not allowed, and that PP must be only a minimum of levels and crop. Having a double exposure in camera, by locking the shutter open and creating your own multiple exposures by covering the lens at certain intervals may get around this...

I don't really know, just pondering...

I think the 1DX has in-camera double (or up to 19, or some-such figure) double exposure.
And in-camera RAW processing.

Yep, there are several Nikon DSLRs that do it, and dozens/scores of P & S models from numerous makers.

Bend The Light wrote in post #13836866
What might be the point is that the rules may stipulate that combining of images in (for e.g.) photoshop is not allowed, and that PP must be only a minimum of levels and crop. Having a double exposure in camera, by locking the shutter open and creating your own multiple exposures by covering the lens at certain intervals may get around this...

I don't really know, just pondering...

This is actually done with some types of shooting, for example when shooting fireworks, you can capture multiple bursts, covering your lens front with something, removing it when the timing is right.

Something fun you can play with is also the fact that with long digital exposures, movement can be "overwritten" so that it doesn't appear in the final image. In fact, I have photos where people walked in and out of a 30-second exposure and don't show up in the image, but it was a very dark scene...

I had some fun with this once. I set an object (a DVD/case) up in one side of the scene then I started a 13-second exposure. After about three seconds, I quickly picked up the case and set it at the other side of the scene, then let the exposure finish: