Do you use "zoom focus?"

Started Dec 16, 2011 | Discussions thread
Shop cameras & lenses ▾
KentG Veteran Member • Posts: 4,285
Re: Do you use "zoom focus?"

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 Pentax K-S1 Sigma 50-150mm F2.8 EX DC APO OS HSM Sigma 18-250mm F3.5-6.3 DC Macro OS HSM +1 more
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow