A: As of June this year, the answer would have to be Panasonic. They are working with Olympus on the Micro Four Thirds standard, with Leica on compact and bridge cameras, and now with Fujifilm on sensor technology. An honorable mention goes to Sony, who provide their sensors to a number of other companies, including Pentax, Nikon, and Olympus, but do not integrate others’ technology into their own products, with the exception of Zeiss lenses. Sony has also been allowing Hasselblad to rebadge some of its cameras as fashion accessories, in a move that many believe is ill-fated on Hasselblad’s part but carries little risk to Sony.
On the flip side, the title of least collaborative company may go to Canon, and there’s not much to say about that, really. Among other less collaborative companies, we find Samsung, Pentax, and Nikon. Samsung uses Schneider-Kreuznach lenses in some of its cameras, and has previously shared sensor technology with Pentax, prior to the latter’s move to Sony. Nikon has recently switched its sensor supplier from Sony to Toshiba, for the D7100. Pentax also apparently takes Tamron lens designs and rebadges them as its own.