You might know what he means, but the OP might not and could be confused by it.
Just because someone has no idea what zoom means, doesn't mean we all have to adopt his misunderstanding and lose the meanings of words.
The lingo DJI has addopted with using term ZOOM has been source of confusion for many. There is no optical zoom in any DJI current multicamera drones line up, period.
Their 3x and 7x "zoom" nomenclature refers to multiplication factor of the main...
Here in Australia you can buy separately one Freewell split filter 32/16 for A$48. But the set of 4 containing 8/0, 16/8, 32/16 and 64/32 is only A$119 which is pretty reasonable, IMHO...