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Is Panasonic 12-35mm II parfocal?

Started Feb 25, 2018 | Discussions thread
Sean Nelson
Sean Nelson Forum Pro • Posts: 16,118
Re: Real parfocal is important in video though
1

kolyy wrote:

None of the lenses I have is able to hold the plane of focus very precisely. In particular, you have to fix the focus when zoomed in, otherwise it does not work.

That's true of parfocal lenses as well.   You simply can't see enough detail when zoomed out to be sure that the lens is properly focused when zoomed in.   It's always been the case for all lenses that you zoom in and focus first if you want to maintain focus across the zoom range.

The test for "simulated parfocal" lenses is this:  if you zoom in and focus, does it hold focus when you zoom out and then zoom back in again.

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