I'd like to ask about the meaning of the phrase in bold letters.
...With the development of the camera-cellphone combination, sharing photos has become even more convenient. The trend continues with many traditional camera makers announcing that they will stop producing most, if not all, of their film-based cameras...
I'm not sure which interpretation would be correct.
1. even if they're not going to stop producing all of their film-based cameras.
2. or they're going to even stop producing all of their film-based cameras.
1.We will stop producing most of our film-based cameras, and just continue to offer our high-end professional range.
2. We will stop production of all our film-based cameras.
most, if not all: here, 'most' refers to the first scenario, and 'if not all' indicates that the camera makers could, instead, opt for the second scenario. Hence, there will be a large reduction in film-based cameras produced by these manufacturers at least, and possibly, they may cease production of them altogether.
It might be used here to soften the blow a bit; I get the feeling that the all option is pretty likely. I imagine that most will stop completely, with the possibility that some manufacturers may buck the trend.