Elementary, My Dear Watson - With Fuji
Ah, Watson, you're here. I hope your in-laws enjoyed their visit.
What? You are astounded that I know of it? But you told me the whole story as you walked up the street. The slightly bent posture and the way you held your hand told me that you had recently handled a heavy object on one side of your body - a valise. The fact that you have a spot of Vicker's steam-oil on your right boot speaks of a visit to a railway station - specifically Paddington as the only railway company in the Great Britain that uses Vickers is the Great Western Railway. Your posture and fatigue exactly coincides with the departure of the 5:12 for Taunton - where your Bother-in-Law and Sister-in-law live. And the look of relief on your face is indescribable...It is so simple when we observe and deduce.
Now, while Mrs. Hudson busies herself with the tea things, have a look at these two cameras from the Japanese firm of Fujifilm and see what you can tell me.
Precisely. They are designed to steal the plans of the Hamilton-Fyshe lighter-than-air mortar emplacement. We must speed to Portsmouth and alert the authorities once the crumpets are done.
What first alerted you? For me it was the weight. The same as the ordinary cameras. And then it was the controls. Just the same as the ordinary cameras. And the settings...just the same as...
Obviously the nefarious agent of destruction - Professor Justin - will be placing these in the hands of minions who will decoy the sentries away from the Hamilton-Fyshe emplacement while the real Fuji X-E1 cameras are used to record the details. We can only hint at which Foreign Power will be paying for this espionage but I think that we can safely say that Professor Justin never does anything foolishly. A dangerous adversary.
So, grasp your teacup and your Adams revolver - we must away to save the Empire!