Working with digital cinema and motion-control has given me an appreciation for Cine Lenses With Gearing On Them. Working in a reality where things cost money keeps me appreciating Stills Lenses With No Gearing But With Less Numbers On The Price Tag. Adding gears to stills lenses has traditionally required relatively expensive/invasive modifications, or compromised solutions involving bolts, cable ties, or other fiddly things.
Last year I figured out how to generate arbitrarily-sized gears for my selection of lenses, changing the internal diameter of each gear by 0.5mm at a time until they fit each lens perfectly.
All the while thinking, “if someone went through this process for a wide range of diameters and shared the designs, everyone’s lenses will get better, forever!”