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Is Panasonic 12-35mm II parfocal?

Started Feb 25, 2018 | Discussions thread
kolyy Senior Member • Posts: 1,596
Re: Real parfocal is important in video though

Stejo wrote:

Maintaining focus when zooming out and not when zooming in is usually an illusion due to DoF differences. Things that seem in focus when on the wide end might actually be wildly out of focus when zoomed in even on a parfocal lens. That's not an indication of anything.

Yes of course, but that is all you get with the correction by the focusing mechanism we have discussed. It is never true parfocality, it is only that the focal plane approximately stays in the DoF when zooming out. Even if you want to take video while zooming in, you first have to fix focus when zoomed in, then zoom out and only then record.

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