The Zeiss ZX1 has to rank up near the top.
just the sort of camera some were asking for except that when it does come about ,nobody wants to buy it.
Anyway it depends on what is meant by "biggest".
If it is about hype , investment , both at the same time ?
Here is one that covers all bases for failure :
A couple of peculiar points about the Nimslo . The first batch was made by Timex , the watch company, in Scotland. When they failed to deliver enough of them the contract went to Sunpak, the Japanese flash company.
I don't remember the initial retail price but stock was cleared out for a fraction of that.
Another HUGE flop was the Agfa Family system .
an attempt by Agfa fo revive interest in Super 8.
I think it came out here in Australia, in 1980, for something like $699 only to be sold off later on for $199 or something like that.
Agfa made the projector in Germany and Elmo made the camera in Japan.
BTW, already mentioned, the product that nearly sent Polaroid bust was the Polavision system.
Instant Movies !
Sounded like a good idea but too expensive and too late.
The camera and projector were made by Eumig in Austria.
The film was developed inside the projector the first time it was loaded onto it.
I sold all three systems above...