Busting the Lens dictates Focus Speed Myth

Started Mar 22, 2013 | Discussions thread
WilbaW
Veteran MemberPosts: 8,695Gear 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.

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