How Do I Know My Lens Focal Length? Finding the focal length of a specific camera lens is easy, and is typically printed directly on the barrel of the lens for ...

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Why is this important to know? There has been many instances where I’ll be trying to photograph a subject that is only a few meters from me and the lens keeps swimming in and out, not able to focus. I’ve fixed this problem every time by setting the correct metering. ie I set 1.8m -∞ for subjects closer than 6.5 meters away, and set 6.5m-∞ for everything 6.5 meters or further in distance.

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The focus limit switch tells the camera where to focus within certain ranges in distance. For example, if you set the switch to 6.5m-∞ then the camera knows not to worry about focussing on anything closer than 6.5 meters. Knowing this information, your camera will shoot faster.

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The focal length of a lens is the distance between the lens's optical center (or principal point) and the image sensor or film when the lens is focused at ...

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For example, I live in a coastal town where I photograph boats anchored out at sea with islands in the background. If I use a wide angle landscape lens, the islands in the background seem much smaller and insignificant than when I use my telephoto zoom lens. For these types of shots I prefer to see layers. Hence, I’ll use my telephoto zoom lens.

Sep 12, 2024 — Objective lenses for microscopes typically have several components, including the front lens, the rear lens, the aperture, the lens barrel, and ...

When photographers hear the term telephoto they usually imagine a long lens between 70 and 500mm focal length or longer. Personally I’ve used 3 different brands and the technique for using them is basically the same.

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Look on the side of your lens and check if it has a focus limit switch. You will recognize it because it will have a distance metering associated with it. For example my Canon lens has a switch on the side that says 1.8m -∞, as well as 6.5m-∞. If your lens doesn’t have this switch then ignore this section.

Blurring backgrounds is easier with a telephoto lens than it is with a wide angle lens. Set your camera aperture on f/8 or lower, zoom the lens out to its longest focal length, and get as close to the subject as possible while still being able to focus. You also need to ensure as much distance as possible between the subject and any background elements. You won’t see any blur if the subject is against a brick wall.

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However you do need to make sure your shutter speed is longer than the focal length of the lens. For example, when you zoom your lens out to 200mm, make sure the shutter speed is at minimum 1/200th of a second or faster. If you zoom it to 300mm focal length, then the shutter speed needs to be at least 1/300th of a second and so forth. This will give you the best chance of getting a sharp image while hand holding your camera.

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A normal focal length is known to be 50mm. When you shoot with a lens set at 50mm focal length, the subject will be photographed in size as you saw it in real life. If you zoom your lens out to 100mm focal length, the image will now be magnified X 2 so the subject appears much closer. Therefore the definition of a telephoto zoom lens is one that can be magnified higher than 50mm focal length.

Analytically, the focal length is described by the lens maker's equation: 1/f = (n - 1)(1/R1 + 1/R2), where R1 and R2 are the radii of curvature, f is the focal ...

All lenses require different techniques for photographers to grasp. Just because you know how to use one lens doesn’t mean you can use the same technique on the next. As strange as it sounds, telephoto and macro lenses have a lot in common. Personally I treat them much the same way.

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A telephoto zoom lens is my favorite piece of glass. Over the years I’ve photographed with Canon, Nikon and Sigma telephoto zoom lens. Before we let you in on the secrets of using these long lenses, we’ll first discuss a couple of basics.

Just because it’s a long lens doesn’t mean you need to use a tripod. In fact I rarely use a tripod when using my telephoto lens. I find them too restrictive when photographing birds and wildlife.

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Using a telephoto zoom lens will totally change the overall feel of the image. Especially when photographing subjects that are further in distance from you. Not only does it bring the main subject closer, but it also brings all the background elements closer as well.

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If you are photographing long exposures or landscapes with a telephoto lens then it is best to use a tripod. If using a tripod, look on the side of your lens for letters VR (vibration reduction for Nikon) or IS (image stabilization for Canon) and turn them off.

Long telephoto zoom lenses are perfect for photographing macro subjects. They allow you to stand further away from the subject so not to scare it away. This has its obvious advantages when shooting timid subjects like dragonflies and insects.

The first time I used my Canon EF 70-200mm f/4L USM lens on a tripod, was to photograph beautiful night shots of the Opera House in Sydney. Looking at the images on my computer I saw they were all out of focus and appeared to have symptoms of camera shake. I later found that by keeping this switch turned on, VR / IS will look for camera vibration and when it doesn’t find it, it keeps looking. Hence in itself causing camera shake. So I went out the next night with IS turned off and captured the image seen below.

Zoom lens are used for instances where you want to fill the frame with a subject that is far in distance and you wish it to appear much closer. Good examples would be sports or animal photography where you cannot be physically close to the subject. Or maybe it is possible but you’d rather not disturb the subject, choosing instead to photograph it naturally. This is particularly useful for street photography where you don’t want the person to know they are being photographed until after the shot is taken.