Panasonic Lumix 14-140mm Video Lens test
This is a different kind of lens test than you typically see. I am not testing auto focus, which depends on the camera, or resolution, which also depends on the camera in video, or stability, which with IBIS also depends on the camera.
What I am testing are lens properties:
How easy is it to pull focus manually? With manual focus you really get to control the speed of transition. How smooth is it? Does it bounce?
Is there lens breathing - does the frame change when you change the focus, which is distracting? Look at the background while the focus is changing.
Finally, is the zoom lens close to parfocal - does the lens maintain focus when you zoom in after you have manually fixed the focus on the zoomed in object?
So, in the first two of the three clips I focus pull on the front subject and then behind the subject and back. Result: smooth and easy and repeatable. Excellent!
And I did not see any focus breathing in either of the two frames in any of the focus pulls - very nice. And the peaking worked perfectly in real time to guide the focus, correctly.
Parfocal: I first fixed the focus at the long end (close up), then zoomed back wide and then slowly zoomed in to get to the same place where I had fixed focus. Despite having fixed the focus, during the slow zoom (not perfectly smooth because it is long and manual), focus was lost in and out. Terrible.
So, a really good lens (the color looks great, nice and light, and has a very good manual focus ability). Small, light, easy to use with excellent range (including getting pretty close). But, no zooming, ever.
See for yourself (there were no outtakes or rehearsals):
The camera is the GX85, so basically the latest Panasonic color.