Sound like a fantasy? Think again. Lens technology, just like camera technology, is improving all the time. There are now a few high quality lenses for your DSLR that have wide angle AND telephoto capabilities, and they have excellent optics, to boot.The Sigma 18-250mm F3.5-6.3 DC OS HSM Zoom Lens is just such a lens. As you can see from the numbers, it is an 18mm wide angle lens at the short end. But it will zoom to a whopping 250mm at the long end.The Sigma 18-250mm F3.5-6.3 DC OS HSM Zoom Lens fits the walk around category perfectly. Here is an explanation of the code you see after “Sigma”:
18-250mm is the focal length – 18mm means you can take a wide shot, like a picture of the landscape
F3.5-6.3 is the aperture value – the lower number, 3.5, is the aperture at 18mm and 6.3 is the aperture at 250mm. Aperture is how much light the lens will let in. The smaller the number, the more light.
DC refers to the type of glass in the lens. Dispersion Compensation – better than average lens glass so that there is less distortion in the photos.
OS stands for Optical Stabilization – the lens has a built in anti shake mechanism to prevent blurry photos at slower shutter speeds.
What all this means is that you can keep this lens on your camera for most normal situations.Maybe you can relate to this situation. You go to the zoo, one of your favorite places to visit because of the wonderfully different photos you can take. You attach a lens to your camera so that you can take pictures at the tiger area. It has to be a telephoto lens because you want to get close ups of the tigers. So there you are taking some great close ups of the big cats, when all of a sudden, right next to the tigers, the elephants line up like they were a circus act. But you can’t get the picture because you don’t have a wide enough lens on your camera.
If you just had that Sigma 18-250, you could have captured all the action without changing lenses.The same thing could happen while on vacation, or just about anywhere. You know it has happened to you more than once.I am not suggesting that you throw away your specialty lenses, like the 180mm macro. But you need one all purpose, walk around lens that you can rely on most of the time.