Lift the zoom ring rubber up and pull it off, then you will see there are 2 holes on the zoom ring. There is a screw in each hole, use a JIS 00 type screwdriver to tighten them up. Put the rubber ring back and you are done.
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It's definitely not a 80D or a replacement for any of the larger cameras. Looking at the relative size of the SD card slot, the buttons, etc, it's about the size of a rebel. Definitely based on the video that is a EF-S lens, so probably either a newer rebel or a new segment for Canon.
Don't expect high ISO noise improvement, Canon is going for low ISO improvements, better color, things like that. Any High ISO noise improvement will be slight. Of course, the new Digic 6 processor will produce jpegs at higher ISO settings and less detail, but the actual raw sensor output will be a incremental improvement.
The Dual Pixel sensor does have promise if Canon can do more things with it than they have shown on the crop cameras. I suspect that there are some more tricks they can use and are reserving them for the more expensive models. That is the standard sales tactic, whether its a iphone, a new car, a TV set, or a Canon DSLR.
That's... sort of the opposite of what I was trying to explain, heh!
The projected image gets physically larger, hence acting like a zoom if you were to collect the light projected on to a 24mm x 36mm selection at the centre of the projection - the entire image is enlarged, you'd be collecting much fewer photons but the image is optically "zoomed in" and very sharp, sort of like a variable aperture zoom
I just talk to my Photographer friends at the Town Camera club, and One recommend me to get This Fastest Lens CANON EF 50 mm F/ 1.0 L USM= $ 2500 to $3500.
"Fastest" :-) ... they say the af is crawling slow, and that's one reason why Canon dumped the lens.
Also note that you cannot much more light from very fast lenses on digital, part of the light coming from steep angles is lost on the digital sensor - so it's for thin dof only.