PhyrePhoX:It could be this way: if there's no feedback on a feature, it's either- working flawless, or- err... used by no one...
if get_nd_present=1 then do something
get_nd_present nif n=1 then do something
if get_nd_present() then do something end
If iris isn't separated from nd, the values should range up to 3: there are also cameras with iris, but without nd.
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