[Bayonet] Works great on my Sony 70-200 GM II. It is much smaller than the huge hood that comes with this lens. And it saves a lot of time when pulling the camera and lens from my bag and storing back in my bag since I no longer have to reverse the hood each time.

[67 mm] So I have a lens that uses a bayonet mount for the OEM hood and has 67 mm filter thread. Additionally, I have an IR filter that I use on this lens, at 77mm (so I can use it on all of my lenses); screws on with an adapter ring. Guess what? You can't use the OEM hood in this situation! As you know, it is a serious money saver to buy filters sized for the largest thread size lens you own, and adapt those to all of your other smaller lenses. This screw on Hood works on ALL of my 77mm filters used in this fashion. What I call a WIN situation!

[Bayonet] First thing noted different than the description of the product is this hood is made of SILICONE and not rubber. Similar but not the same. Silicone is superior in UV and heat resistance and will provide much longer service. This hood is flexible and will NOT remain extended if any degree of force is applied. It stays in the pre-determined positions well even with the high degree of flexibility and no force applied. It threads cleanly on and off of the 77mm filter threads with no binding. It covers a range of 28 - 400MM with no vignetting or focus issues.

Since there was little dimensional detail regarding this item, the following provides dimensional values for the Kaiser 3-in-1 hood:
The length of the hood installed on a filter (B&W UV):
Fully extended: 2.50 inches (beyond glass)
Mid-Position: 1.50 inches
Full Collapsed: 1.12 inches

Hood maximum outside diameter: 4.12 inches
Hood minimum inside diameter: 3.88 inches
Hood wall thickness: .12 inch

In comparison to an installed Canon ET-83D Hood (100 - 400mm lens) with the same B&W UV filter, the Kaiser 77MM 3-1 flexible hood has .62 inch less effective length beyond the filter glass

I debated whether or not this hood would be worth the additional money versus a much cheaper rubber version. Yes it is. The material alone makes the difference. I would purchase this Kaiser hood again

[0.255 lb] Excellent and stable

[Bayonet] After my Canon RF 70-200mm lens hood took a hard hit that broke the lens hood mount right off of the lens, I thought I would never be able to attach a lens hood to my lens again... until I found this lens hood that screws right into the filter threads on the end of the lens! It works beautifully, and it's even easier to travel with than the original lens hood.

[0.255 lb] Works as advertised with Nikon 70-200mm f/2.8 E FL lens.

[0.255 lb] It's a lens cap... How exciting could this be? It does the job.

[Bayonet] What a great design! Does WA, normal and Tele in one hood. Compact for storing when folded to the WA extension.

[Bayonet] I got a Sensei lens hood for an old lens without a dedicated hood. The Sensei has a filter thread at the front end, too. I don't like to fiddle inside the hood to get the cap on - so, I needed a lens cap that would fit in front, et voil...

[67 mm] for my sony xp1 44mp lens shade works well