Busting the Lens dictates Focus Speed Myth

Started Mar 22, 2013 | Discussions thread
WilbaW
Veteran MemberPosts: 9,295Gear list
Like?
Re: Busting the Lens dictates Focus Speed Myth
In reply to bhollis, Mar 31, 2013

bhollis wrote:

the change in focusing speed when I put a 1.4x TC on my 70-200 f/4L IS is very noticeable.

That would be because the TC alters the relationships between the parameters required to calculate the lens commands. It's very apparent with a short extension tube - focus converges on the target by oscillating between front and back focus, rather than approaching the target from one direction.

 WilbaW's gear list:WilbaW's gear list
Canon EOS 60D Canon EOS 7D Mark II
Reply   Reply with quote   Complain
Post (hide subjects)Posted by
nopeNew
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow