GoWing Lens Flipper for Nikon F-Mount Lenses

I bought this to be able to carry a Tokina 100mm f/2.8 macro lens with me, and at times a Nikon 70-300mm. Both worked well with the Lens Flipper. They don't mention that there is a cap in the box, so I bought a cap at the same time. It's ok to have the two (one from the box and the extra for like 5) because when not in use you can cover both sides to prevent dust and dirt. My two comments is that I would like a color code to be able to know which lens you are releasing. If you check out videos on how to use it, you carry one lens with the Lens Flipper, then when you want to switch lens, you remove from the camera and attach the camera lens to the lens flipper, then you remove the new lens from the flipper. However, for the few seconds you have both lenses on the lens flipper, it is possible to release the wrong lens. Example, I had my macro lens on the lens flipper and A 24-120mm on my D750. Once both lens were on the lens flipper, I was holding the macro ready for the release to allow me to mount it on my D750. But by mistake I pressed the release for the 24-120. So be careful to release the correct lens. If there was a color coding on the release, that mistake would be harder to make. I also would like the release to be a bit more firm, I am a little concerned that it could bump against something and release the lens. Maybe they should have a lock position. But overall I found it very useful.