7D AF: Closed Loop when using PD?

Started Sep 1, 2012 | Discussions thread
ForumParentFirstPreviousNextNext unread
Flat view
mcslsk
Contributing MemberPosts: 992Gear list
Like?
7D AF: Closed Loop when using PD?
Sep 1, 2012

Can someone who knows help me on this one? I've read somewhere that it used to be that Canon cameras when using phase detection for AF were not "closed loop", i.e. the camera would measure the setting for the lens motor to achieve AF and then tell the lens to set focus based on that number. But once the lens reported back to the camera that it had moved the lens elements according to that number, there was not a second measurement to confirm that focus had actually been achieved (excuse my very uneducated language on this one). Has the 7D always been "closed loop" or is this something that maybe FW 2.0 has introduced (which could explain some people reporting not MFA is required anymore)?

 mcslsk's gear list:mcslsk's gear list
Canon PowerShot S110 G1 X II Sony Alpha NEX-6 Sony E 50mm F1.8 OSS Sony E 55-210mm F4.5-6.3 OSS +3 more
Canon EOS 7D
If you believe there are incorrect tags, please send us this post using our feedback form.
ForumParentFirstPreviousNextNext unread
Flat view
Post (hide subjects)Posted by
ForumParentFirstPreviousNextNext unread
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow