Would you mind giving me a couple of such links preferably those with more detailed like diagrams and scientific testing done.Don't forget SSM.
In general, the ring motors are slower. But this also depends on lens design; how large are the lens elements that need to be moved around, etc. These have actually already been discussed o many other forums online...
Would you mind giving me a couple of such links preferably those with more detailed like diagrams and scientific testing done.
Thanks in advance.
Dun forget Olympus SWD (Supersonic Wave Drive)
Olympus 12-60mm F2.8-4 SWD is develop to be the world fastest AF System. See quote below from here. however is this few year old technology, not sure if any other catch up.
"Autofocusing is powered by Olympus’s breakthrough SWD. Developed as the “world’s fastest AF system”, this extraordinary autofocusing drive provides both high speed and high precision while operating with lower noise than ever."
Does quickest also mean most accurate? And how to define accurate? :dunno:
They are more or less based on the same principles and technology, just under different trademarks.has there been a official study of such?
USM
Ultrasonic Motor Ring/Micro
HSM
Hyper-Sonic Motor
SDM
Supersonic-Drive Motor
SWM
Silent Wave Motor
SSM
Super Sonic Motor
opinions?
This only refers to accuracy of executing the positioning command from the camera. I guess wildcat referred to the overall accuracy of the system "camera AF sensor + lens".read quote highlighted in bold from post #6
So only objects closer than 1m are recognized with a specific distance, everything else is just 'infinity'? If that's true than I'm not surprised about the "speed", simply pushing the lens to 'infinity' is not very difficult. Given also the deeper DOF for the 2x crop factor of 4/3 systems any focusing error of the system is less visible than on a FF cam.FYI after 1m the range gone to infinity.
This only refers to accuracy of executing the positioning command from the camera. I guess wildcat referred to the overall accuracy of the system "camera AF sensor + lens".
So only objects closer than 1m are recognized with a specific distance, everything else is just 'infinity'? If that's true than I'm not surprised about the "speed", simply pushing the lens to 'infinity' is not very difficult. Given also the deeper DOF for the 2x crop factor of 4/3 systems any focusing error of the system is less visible than on a FF cam.
No doubts about your experience, but let's compare in the right context
last week finally managed to see a Olympus Pro User in action....during an S-League match of all places. The setup was simple but the pictures looked quite nice. Got some nice tips for next time.SWD (olympus) is the 1st thing that came into my mind when i read the thread's topic...
im a canon user but occasionally using & trying other brands, namely nikon, pentax, & sony. i must say that SWD i so darn fast!!!
but 100L is also very fast, even on poor AFing 5D2...
The speed really depends on the type of the lens, amount of focus ring travel and weight of glass inside, isn't it? I mean you can't expect a macro lens with such long travel from mfd to inifinity to be as quick, even though it may have usm or hsm. And even for the same lens, at different focal length, the af speed can be different also, isn't it?