A few words on choice of ultrawide lenses for such a series!
Antonio,
One could achieve the same result with "stitching" adjacent overlapping frames or else go for investment in an ultra wide. To many photographers,14 mm is considered a very specialized focal length and almost for most purposes, an unneeded luxury. This demanding series shows how this needs to be rethought. In fact, acquiring the skills, experience and instinct to use an ultrawide with people doing a task will pay off over and over again. Suddenly we add to the frame social or environmental context! This enriches the picture and turns a mere documentation of a procedure into a statement of human endeavor!
As to focal length, 14 mm is an excellent choice, and compared to stitching, say from a 28mm lens, means one has to get the central action in one shot and then have two overlapping side shots to get in the b.g. However, this now commits us to a lot of work on the computer, which is really a waste of one's time if one has the right lens for the job! For action shots like this, stitching, although perfectly doable in skilled hands, is grossly inefficient and becomes a "black hole" to swallow up time!
Ultra wide lenses, especially for full frame cameras can be very expensive, but in real economics, the time saved is enormous! Samsung has a 14mm lens for DSLRs at just $319 from
B&H. For to get rid of vertical distortion, Venus, a Chinese company has just released an amazing 15mn macro lens with 6mn of vertical shift for Canon, Nikon and Sony cameras and it's just about $550!
But, Antonio, the fine results with your compact and mature Olympus system, shows that price of these extraordinary optics can be had for much more reasonable price than for us dinosaurs insisting on "full frame cameras! Up to 16x 20" I expect that little practical benefit can be seen from the larger format "big brother" usual sensors of DSLRs!
(The Sony A7R may do better just because of the extra bite of the amassed pixels, more distinguishable DOF and greater dynamic range.)
Still, no matter the actual format, I now realize that a 14 mm focal length, (or as here it's 7mm version in the 4/3 system), is not a luxury, but part of one's toolkit if one wants to get the person doing a job in context like this!
Of course, for extra detail of static scenes, stitching delivers!
A good lesson to be learned here!
Asher