PIX 2015

Do you use "zoom focus?"

Started Dec 16, 2011 | Discussions thread
Shop cameras & lenses ▾
KentG
Veteran MemberPosts: 4,072Gear list
Like?
Re: Do you use "zoom focus?"
In reply to Dan P1, Dec 17, 2011

Current zoom lenses are varifocal not parfocal. Parfocal means that the lens has the same focus point regardless of the zoom setting. Varifocal means that the focus point changes as the lens is zoomed. So whether you zoom in or not the camera must refocus at the new setting to have correct focus.
Kent Gittings

 KentG's gear list:KentG's gear list
Pentax K-5 II Pentax K-5 IIs Tamron SP AF 10-24mm F/3.5-4.5 Di II LD Aspherical (IF) Sigma 50-150mm F2.8 EX DC APO OS HSM Pentax FA 150-450mm F4.5-5.6
Reply   Reply with quote   Complain
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow