09-23-2010, 02:24 PM
[quote name='wim' timestamp='1285250841' post='3163']
I don't understand your last statement. As long as the interface to the lens works the same way, I don't see why contrast detection algorithms require different electro-mechanics in a lens. Phase based systems work on predictions, and in difficult situations on a loop-through; a fast contrast AF system will also have to work on predictions and/or ;loop-through, so I do not see how this will affect the electro-mechanics: it is just an interface, at least from an AF POV, to tell the lens where to move to.
If anything, it should be rather simple to create a backward compatible mount, especially for EF and EF-S lenes for Canon, and AFS lenses for Nikon. They would only have to create the appropriate adapter from new mount to old mount, which essentially should just be an extension tube with contacts.
Kind regards, Wim
[/quote]
If it was that simple Sony wouldn't have struggled with their Alpha-mount adapter.
Even the four-thirds gang has issues here.
That said - I don't understand the problem either.
I don't understand your last statement. As long as the interface to the lens works the same way, I don't see why contrast detection algorithms require different electro-mechanics in a lens. Phase based systems work on predictions, and in difficult situations on a loop-through; a fast contrast AF system will also have to work on predictions and/or ;loop-through, so I do not see how this will affect the electro-mechanics: it is just an interface, at least from an AF POV, to tell the lens where to move to.
If anything, it should be rather simple to create a backward compatible mount, especially for EF and EF-S lenes for Canon, and AFS lenses for Nikon. They would only have to create the appropriate adapter from new mount to old mount, which essentially should just be an extension tube with contacts.
Kind regards, Wim
[/quote]
If it was that simple Sony wouldn't have struggled with their Alpha-mount adapter.
Even the four-thirds gang has issues here.
That said - I don't understand the problem either.