During my initial review (see here) I mentioned that I was nervous about putting a heavy lens on it because I didn't feel it would stand up to the weight. I received an email stating that the Lens Flipper was tested to hold about 132 pounds. Taking their word for it, I set off to photograph the Austin City Limits Festival and I used the Lens Flipper to carry the new $Sigma 120-300mm f/2.8 | S lens that was on loan from Sigma. The lens weighs about 7.5-8 pounds. A far cry from 132 pounds.
Well the unthinkable happened. The Lens Flipper failed and the Sigma lens dropped to the asphalt and smashed many of the internal elements. This is what the $3599 lens looks like after falling straight to the asphalt.
After a bit of back and forth with the Lens Flipper company (which initially expressed some doubt that they were at fault) I was informed during the manufacturing process in the plant in Korea the screws were not tightened down to the correct specifications and therefore were prone to loosening. The loose screws caused the lens mount to flex and warp enough that the locking pin that holds the lens securely in place was rendered useless resulting in a catastrophic failure.
|Here you can see the loose screw.|
|This shows how the metal lens mounting flange warped under the pressure of the weight of the lens.|
|This also shows warpage of the metal flange.|