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A photographic lens is used to focus the light onto film or a digital sensor. Many cameras have interchangeable lens systems, allowing the photographer to choose the type of lens to use.

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That lens is available from Sigma with a Sony mount, so there's no need for an adapter if you haven't yet bought the lens -- just buy the Sony version. If you already have the lens for some other … mount, see Can I use lens brand X on interchangeable lens camera brand Y? for information about which mounts can be adapted to which others and what drawbacks might be involved. It looks like the a200 …
answered Feb 5 '16 by Caleb
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If a zoom lens has a focal distance scale on it, does that mean that the lens is parfocal? No, many zoom lenses are varifocal. As it's used in photography, the term parfocal means that the lens … should remain focused at the same distance as the focal length changes. Every zoom lens that I can think of has a distance scale, but most change focus slightly as the lens is zoomed. Or does it …
answered Sep 25 '17 by Caleb
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quickly zoom in to get a shot of a player on the other side of the field, or you can zoom out for a shot where the ball is close to you. When set to 16mm, the lens will be a fairly wide wide-angle lens … , meaning that images will show a lot of the scene in front of the camera. At 300mm, the lens is a fairly long telephoto lens, meaning that it'll capture a much narrower part of the overall scene, making …
answered Jan 10 '16 by Caleb
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The lens also says: "Digital NC 58 mm Japan Optics" and Bower. It sounds like the macro lens you have is actually an auxiliary lens that attaches to the front of the camera's main lens. If … that's the case, then that lens will probably attach to any other camera with the same diameter and thread pitch. From the 58mm in your description, it's a good bet that the diameter is 58mm, and filter …
answered Jan 16 '19 by Caleb
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I have never interacted with a lens that has a collar, so I'm not completely sure what these do. The "collar" is also known as a tripod mounting ring, and that term better describes the main … function of the device. The ring does two things: It supports the body of the lens and thereby reduces the strain on both halves of the lens mount. It puts the tripod mounting point close to the …
answered Apr 21 '17 by Caleb
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missing in my lens family in order to reach my photography goals? Nothing. I think you've got a fine collection already. In fact, for your stated goals ("newborn, family events, birthdays") you … probably don't need the 55-200mm zoom. I'd suggest saving your lens money for now and instead getting a better handle on what you already have. Sit down and pick out the photos that you've taken already …
answered Feb 22 '16 by Caleb
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Some people cut a hole in a rear lens cap and then attach a step ring to which they can add a filter. Others just try to be careful when shooting with a reversed lens. Update: As explained in this …
answered Nov 7 '14 by Caleb
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any lens you put on it will have a field of view similar to a lens that has 1.6 times longer focal length on the 6D. That is, a 100mm lens on the 650D will have the same field of view as a 160mm lens … focal lengths ranging from 24mm to 960mm, since the 150-600mm lens on the 650D will look like 960mm at the long end. If you do it the other way around, then you won't be able to get as wide a shot …
answered Nov 1 '17 by Caleb
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Notice that the link you provided is to a 15mm f/8 lens, not f/1.8. With those numbers, the lens can be tiny, as seen in the picture: The very small amount of glass in that lens is probably the …
answered Jan 6 '14 by Caleb
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What damage could be caused by touching the rear part of a lens? What could happen is that a bit of grit stuck to a grubby finger could scratch the rear element. But if you don't see any … scratches after your recent experience, it's nothing to worry about. Also, overly aggressive cleaning can wear away lens coatings over time, and the best way to avoid that is to avoid the need to clean the …
answered Oct 3 '16 by Caleb
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aperture and image stabilization, while the second has a smaller f/4 aperture and no image stabilization. The larger aperture needs larger lens elements, and a good image stabilization system also adds … cost. Between the larger aperture and IS, you'll be able to shoot handheld in lower light with the pricier lens, and the larger aperture also gives you shallower depth of field for better separation of …
answered Mar 3 '16 by Caleb
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manually stopping the lens down using the the depth of field preview button, you'd do that when you want to (can you guess?) check the depth of field for the aperture that you've chosen. Normally …
answered May 11 '13 by Caleb
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Will a Canon EF 28mm f/2.8 IS USM Wide Angle Lens - Fixed work on a Rebel T3i? Yes. Any Canon EF lens will work on an EOS camera, which includes the Rebel T3i. What does IS UMS mean? IS … stands for image stabilization. USM means the lens has an ultrasonic autofocus motor, which is desirable because it's faster and quieter than some other AF motors. …
answered Mar 28 '16 by Caleb
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Anyone have suggestions how to eliminate the lens reflection off the surface. There are a few things you can do: Block the light. The only way you could see a reflection of the camera is if … mirror. Rotating the subject slightly, or moving the camera a bit, might change the angle so that the camera isn't in the area that the gem reflects. Use a longer lens. A lens with longer focal length will …
answered Sep 29 '16 by Caleb
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I think it should look like this one...What can it be? The front and back glass of the lens look clean. Both lenses exhibit some lens flare. Flare is caused by light bouncing around inside the … lens and eventually reaching the sensor. It's natural that two different lenses, constructed with different elements and different coatings, have different lens flare patterns. Indeed, just changing …
answered Aug 22 '16 by Caleb

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