I agree and knew that steroscopic photogrpahy had been around for a while, but as a form of military intell, it was very new. The British air services did not form the first heavier than air recon units until 1913, and lagged very badly in terms of the cameras they were usiing. The following article suggest that sterscopic capability was not available to the British (and americans) until after 1917.
Aerial reconnaissance in World War I - Wikipedia, the free encyclopedia
So while it was far from being "invented", it was definately a new technique particulalry for the british. we are back where we started. Is it plausible for the British to be able to take these photos with the technology and expertise they possessed with less than a years existence for their recon arms?
And therein lies the problem. The British dont seem to have the necessary technology and/or expertise, to do that, at least as a militarily efficient exercise, until after 1917. Im missing something here....obviously they did take this sequence, and one has to assume they were taken during the p[lanning stages of the operation (1914) but other sources are saying they dont posses that capability until later in the war.
you still need the ability to take the photos in a specific sequaence and spacing, which the British dont seem to have possessed until later in the war.