After all the fun with requests for a 'Fast Focussing' lens on recent threads, it occured to me again that there is no standard for this. WHY?? We all know this depends on such things as Camera Body, Lens Aperture, AF-S or Screw-drive, available light etc, but it CANNOT be that hard to get something better than 'faster than a Nikon 200mm f4 or slower than a Sigma 50mm 1.4 HSM'. I'm suprised the camera manufacturing industry hasn't got hold of this, it just loves numbers to sell us stuff. Shutter delay of 0.01 seconds, 9fps, 24million pixels, 16 bit RAW, x25 zoom, 128000 ISO etc etc.. How about time to lock-on from infinity to minimum focus at an ISO Mk IIb Target under 1000 LUX daylight balanced illumination? This should be lens specific and not reliant on the focussing module. The Auto industry has (been) organised the specifications for 'standardised' fuel economy (you've all heard of the Urban Cycle??), acceleration, top speed etc and there can be no less competition between eg Ford, BMW or Fiat. The computer industry is surrounded by Benchmarks for EVERYTHING, CPUs, Mobos, RAM, HDDs etc etc and they're even more competitive for sales.. AMD v INTEL or ATi v Nvidia anyone? There will no doubt be some tinkering by Manufacturer X's lens to work better on the tests than 'real-life' but they'd soon be ratted out. What do you guys think??