CrDeviceProperty_ManualInputForNDFilterValue

Get/Set the manual input value of the ND filter

CrDataType: CrDataType_UInt64Array

Parameter Code	Explanation
0xFFFFFFFFFFFFFFFF	nothing to display.
Other than above values	The real value of ND Filter (Upper four bytes: numerator, Lower four bytes: denominator)

This value is expressed in transmittance.