ole sarg Loc: south florida

does anyone know how hockney shot his collages?

EstherP

With a camera, one photo at a time?
All kidding aside, I had a look at "the only authorized website" and I would suggest that most, if not all of the images there are not created in-camera, but in post-processing.
EstherP

Mulachabu Loc: Sydney Australia

I am fairly sure that he used some kind of polaroid setup, his swimming pool images were very impressive.

GC-FineArt Loc: WDC

Here's one discussion of his technique http://lisathatcher.wordpress.com/2012/03/07/david-hockney-collage-and-larger-than-life/

alycrom Loc: Aberdeen Scotland

unfortunately your location is showing as 'in hiding' so i have no idea if you will be able to see this tv prog but on sky arts 1 there is a prog called 'Hockney on Photography' where he demonstrates exactly how he does his collages among other things. if you have sky then it is available in the 'on demand' section. i have had a quick look on youtube but it does not seem to be there. I watched this a number of months ago and i remember that he visited the grand canyon and explained how he did the collage for it.

The prob blurb says...
For the first time the artist and photographer offers insight into his creative process, revealing the techniques and inspiration behind innovative works such as Pearlblossom Highway.

cecilia delacroix Loc: near Seattle

Page 270 of "A bigger Picture" (Chapter titled "Why Nine Cameras?" ) shows how he used a rig (attached to his vehicle) that held 9 cameras. You can also google "Nine Cameras Hockney" to see a 5-minute YouTube video.