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One of the great advantages of an SLR of course is that you can take the lens off and put on a different lens. Now even if you don't have multiple lenses, you still need to know how to attach the lens that came with your camera. If you do have multiple lenses, knowing how to change them quickly and easily is a really good skill to develop. When you're carrying more than one lens, you want to be able to work quickly to get one off and the other on, so that you don't miss a shot. Also, though, you want to be able to work quickly, because once you open the camera up, then you're exposing the sensor to dust and that can mess up your image. So I have got D800 here and I have a lens.
Now, this may not be the same lens that you have, but that's okay; the process does the same. First of all, I have got a cap on the end of my lens-- I'm not talking about the lens cap; I'm talking about the other side--and I have got a cap on the camera body. Both of those have to come off, and they simply twist off. So I'm just going to take those off, and now I'm ready to get the lens on. Somewhere on the lens there is a white dot. Find that white dot and the corresponding dot on the camera body. If I just line those two dots up--and you can see I am pushing the lens in until its flush and then turning until I hear--ah, the click of successful lens attachment there.
So, now my lens is on and I'm good to go. Thing is, that I got these things left over. I got these caps left over. So take this and screw them together and they won't come apart. Now, this is not just a convenient way to keep from losing them, it's a very important way of keeping them clean. So what I do with this thing? I could take this and stick it in my pocket, but my pocket is full of lint and chewing gum and frogs and who knows what else. So I don't really want stick this in there, because I'm going to end up getting dust all over it, and then I'm going to take this often and put them back on the camera lens at some point, and all that dust is going to be transferred there.
So, it's a really good idea to keep these in your camera bag or somewhere pretty clean. Most of the time sensor dust comes from the lens, so keeping the lens clean is a good way of keeping from getting sensor dust on your camera. Then I got this thing. This is a sunshade. This goes on the end of the lens, and it's there to prevent flare. So I just fit it on the end of the lens and twist it until it clicks. So the idea is, particularly of wide angles, if I'm shooting into a light source--not directly into a light source, but in the direction of a light source--this is going to help cut down on flare. Those are those bright circles that might appear, or general loss of contrast that might appear as a result of lens flare.
Keeping it on the end of the lens makes the lens much longer though, so that can make it harder to pack, so if you want to take it with you and you're trying to figure out how to pack it, just put it on backwards, and now it's locked in there. It makes my lens fatter but shorter, so that might fit into the bag better. So that's changing the lens. Now, if you're doing this with a bag in your hand and you've got a couple of lenses, you're going to need to figure out where to hold some things. Having a strap on your camera is going to make big difference there, because you can just leave the camera hanging around your neck, which mean you don't have to worry about dropping it. All you have to do is worry about dropping your lenses.
Use common sense when you're changing lenses. If you're somewhere very windy, if you're some where very dusty, if you're somewhere where there's a lot of stuff that could get on your sensor, try to keep the camera sheltered, and then you keep it up against your body. When you take the lens off, be sure the camera stays pointed down. That's going to help gravity drop things out there. So, just be a little careful. If you're standing on the top of a sand dune in a sandstorm, don't change lenses. If you exercise a little of prevention, you'll stand a much better chance of making your lens changes without getting your sensor dirty.
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