The tripod mount is a feature that is available on some lenses, not all lenses, typically you're going to find it on the better quality tele-photo lenses. When you have your camera mounted on a tripod with a telephoto lens, all that weight on the front of it, can cause it to be very difficult to tighten your tripod down, to really lock it in your position. I know if I have a set up like this, I have to point my camera notably above where I actually want it, because by the time that everything actually locks in to place the whole camera has slipped down, and that's because the center of gravity is way out in front of the lens. A much better solution is to get the camera in a much more stable position, with a tripod mount. And so the other benefit to this, is that when you change from horizontal to vertical, your camera stays in exactly the same position. You don't have to tilt the camera way off to the side of it, and anyone who uses a macro lens or is very critical about their composit...
ion will know that this sort of thing makes life a lot easier. So for instance, I have a lens right here. This is a big 300 millimeter, 2.8 lens. And this has a tripod collar right a part of it. And so I can loosen up the tripod collar and tilt the lens. And so the nice thing is that when I point the lens someplace and then I decide, you know what, I would like a vertical, all I have to do is this and it actually has a little click stop and just locks right in there, and I'm not moving the camera. And that's a big difference from, let me lock this off here for a moment, if I needed to go vertical and I didn't have that, I would have to bring it over here and it's in a much less stable position, and this tripod collar is just fantastic. I love being able to just turn the lens like this. And so if you have that option for a telephoto lens or a macro lens, highly recommend using that option, it makes things really easy to work with. Now if you do want to be able to keep your camera and rotate it in a very simple manner but don't have a tripod collar, you can use an L-Bracket. And so these L-Brackets are usually custom made for different cameras, and they allow you to shoot horizontal. And then when you want to shoot vertical, you can just simply take it out, rotate the camera, slide it in vertically, and now your lens is very much in the same position and you don't have to go reposition your tripod for that. And so these L-Brackets are made by a number of different manufacturers and they're very very helpful for anyone who shoots form a tripod quite frequently and likes to shoot horizontals and verticals.