ill post a link at the bottom
fabricator has a article about the modern adf helmets. a representative from balder says in plain english that if the switch time is less than (aka faster than) .2ms then the eye cant tell any difference. so every helmet on the market is likely 2-3 times faster than .2ms. probly even $60 **** from amazon.
heres something else most people dont know. speedglas offers the most adf models (9). far more than anyone else. whether its their $250 or $800 model , they all switch at .1ms (73F). this isnt by accident or happenstance. surely theyve done hundreds if not thousands of tests and determined exactly the same conclusion as the fellow from balder spoke about. once the switch speed is faster than a certain point ,the eye can tell no difference.
miller claims about .05ms (probly for better marketing) but they wont divulge at what temperature. its possible their lenses are no faster than anyone elses. but it still doesnt matter as even the very worst chinese filter on ebay is probly 2x faster than what it really needs to be
These days welders can peer through welding helmets and see the world in color.
www.thefabricator.com