Georg, that's a nice story, but it's grossly unfair to the Japanese. To be sure, they received a lot of assistance in post-war reconstruction, but they transformed into a world-class manufacturing and design power and made a lot of genuine contributions along the way.
Asahi (now Pentax) invented the automatic-return mirror in 1954, with the Asahiflex IIB. Nikon introduced the F in 1959. I think it's pretty safe to say that they were building "passable" cameras by then, and it's very likely that without the contributions from Asahi the 35mm SLR wouldn't have nearly the dominance that it does today.
Leica was so "innovative" that they wrote off SLRs as a passing fad until 1964, when they introduced the LeicaFlex, and they were so chronically far behind in features and design that they gave up and partnered with Minolta in 1976 to catch up, an arrangement that lasted through the R7's retirement in 1996. It's only recently that they stopped rebadging Panasonics for their compact digital line.
Voigtlander/Zeiss didn't stop producing cameras until 1972, thirteen years after the F made Nikon an unmistakable contender. For having "shifted into aerospace optics, cartography etc.," they sure took a long time to wind down that factory.
Kodak was building consumer cameras in the US and Germany both until well into the eighties.
The Germans didn't think, "Oh, the Japanese can build passable cameras now, so we should leave that multimillion-dollar market to them. Time to do aerospace and cartography lenses." That was a knock-down, drag-out fight for market share.
In the meantime, Japan put out some truly world-class cameras and optics. The XPan is widely praised, and that's a Fuji design. Fuji has a long history of building new, interesting cameras, "just because they can". They even released a new, very tasteful GF670 in 2009. Think about that: they built a new film camera in 2009! Ctein rates some of the EL Nikkors as the best enlarging lenses he ever saw, and certainly the Cosina lenses are no joke. The Mamiya 7 lenses are triumphs of manufacturing precision, and the tests say they'll go toe-to-toe with anything Leica ever put on an M, only bigger. Japanese companies certainly owe a debt of inspiration to the Germans for the head start, but it's no more than they owe for the automobile. In the meantime, they raised the bar in a very big way, and photographers everywhere came out ahead as a result.
A good lens is a good lens, and a good camera is a good camera. Some German companies build world-class optics. Some Japanese companies build world-class optics. Some American companies build world-class optics! Who do you think builds the sniper scopes that can draw a bead on a target a mile and a half away? Why are you people so invested in ignoring Japanese achievements and contributions? I swear, I love my Zeiss lenses as much as the next guy, and I'd like to own a Leica one day, but this cultish Teutonic superiority complex gets really, really old.