It says it uses "very high bond transfer tape". So I guess it sticks on.
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The 24-105L was my most-used lens until I got the 24-70/2.8L II. Whether or not it makes sense to have both depends on what you shoot. The IS of the 24-105 makes it useful for static subjects in low light with no tripod. In a studio situation, where you have lots of light and a backdrop, meaning you can stop down to f/8 or narrower, the IQ differences are minimal (the 24-105 is very sharp stopped down), and the longer tele end is very useful - you can go from a group portrait to an individual headshot with one lens.
Having stated that, after a few months of not using my 24-105L, I sold it...and haven't regretted it at all.
How could you tell from a video?
The video showed a comparison of this lens with other unidentified popular 50mm lenses.