I'd be careful in purchasing a Panasonic Leica Elmarit 14-50mm/f2.8-3.5 lens. They had quality control issues with it. I have one where I am unable to change the aperture on the barrel and I am also unable to adjust the focus on my BMPCC 4K. I got it for cheap from a poor fellow student who paid $600 for it a long time ago.
This is what others have reported:
https://www.google.com/amp/s/www.bhphot ... l.html/amp"I purchased my Leica Digilux 3 with this Elmarit 14-50 mm zoom lens in 2007. I love this camera and lens, and have been completely satisfied with its performance, until 2 days ago, when the zoom froze at approximately 22 mm. I could zoom 22-14, but not past 22 mm. It eventually unfroze, worked fine 22-50 mm and worked for a couple of minutes through the full focal length, then froze again, and again, and again. I eventually started a search for information about repair or replacement, and was shocked to find a review, dated September 2010, describing this exact problem, including the focal point at which it froze and the approximate age of the lens. More reviews turned up with the same problem. I'm heartbroken and depressed;" ...One reviewer noted 3 options: "repair, replace, or scrap the whole system."
The lens I have has the same problem freezing at 22mm. If I turn the lens upside down an wiggle it right it can temporarily get past the 22mm frozen point. Recently, I saw a post where someone said that they had to go through the settings within the Blackmagic camera to adjust the F stop. I was unable to do this on my BMPCC 4K using a cheap smart adapter. I assume that the electronics are fried.
I think I found another guy online complain that it happened on his lens because he left the OIS switch on while removing the lens. Maybe the contacts shorted out and there were no buffer circuits to protect the electronics.
It's a shame because it has good reviews for it's optical performance. I heard that it does not adjust the image in firmware to correct for chromatic aberration like the later Panasonic lenses do.