デジタルカメラのレンズを買おうと調べはじめると、さまざまなメーカーがさまざまな種類のレンズを作っていて、どれを買ったらいいのかわからなくなります。おまけに、OSSだのSSMだのといった、意味不明な専門用語の嵐…。 And if you have a lets say 700mm lens then its a long lens and it has a narrow angle of view. An f/2.8 aperture, for example, will appear as 1:28. The two aperture numbers represent the largest aperture available at your camera's zoom range. if (typeof siteads.queue !== 'undefined') { If you're using a zoom lens, you'll instead see a maximum aperture range, like f/3.5-4.5. If your lens has a smaller focal length lets say 10mm then it is a wide angle lens. With a little education, you can determine which features in your new lens are superfluous, essential, or just nice to have. I hope this is a great cheat sheet that you can print out and take advantage of! A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically. Some full-frame cameras support cropped lenses, but that cropped lens, designed for a smaller sensor, will result in a photo that uses less of the full-frame sensor's area. Ultrasonic motors allow for quieter and faster focal adjustments, keeping your image in focus more accurately than the slower electronic motors found in less expensive lenses. It usually occurs near the edges of a photograph. マニュアルレンズなんかでは、ゴチャゴチャとレンズ本体に目盛りが刻印されていたりします。 この目盛りは「被写界深度目盛り」などと呼ばれて、フォーカスの合う範囲を視覚化したもので、目盛りを元 … If you see a lens with a switch labelled "AF/MF", that means you'll be able to quickly enable the feature - or disable, if you're going for a particular look in your photographs, or want more control over the image's depth of field in a controlled environment such as a studio. Your camera lens' maximum aperture number, measured in "f-numbers" or "f-stops", is usually indicated in the same manner on every lens. We can use EF lens on cropped sensor camera too. And we have the following text at the bottom of the lens. That's why wide-angle lenses have focal lengths ranging from 10-30mm. Learn how to read your camera lens with this free photographer cheat sheet! And when we set it to OFF mode then the Image Stabilizer is turned off. When the lens is at 18mm then we get a wider view. The DxOMark Lens Score corresponds to an average of the optimal quantity of information that the camera can capture for each foca… In this case it is a CANON lens. CANON ZOOM LENS EF-S 18-55mm 1:3.5-5.6 IS STM. Privacy Policy. When using optical zoom, some digital cameras will have a smooth zoom, meaning you can stop at any point along the entire length of the zoom for a partial zoom. Though this lens has a 3.5 aperture it is still not great for low light scenarios. 50mm. And if you have a lets say 700mm lens then its a long lens and it has a narrow angle of view. Look at your camera body where the lens mounts to the camera. If we look at the lens we can see some text. The non-technical definition of the focal length of a digital camera lens is the distance between the lens surface and the image sensor. Struggling with finding the best types of camera lenses and their uses? Professional-grade lenses are designed to be both incredibly accurate as well as more durable than consumer-grade lenses. EF-S lens mount is a derivative of the EF lens mount by Canon. It's measured in millimetres, just like a camera's focal length, and can be found next to the ø symbol, which represents diameter. If we look closer we can see the following text. The focal length number (or range) is found on nearly every camera lens, and is often found next to the lens aperture number. And since it is a zoom lens so, we have variable focal length for this lens. This means that the camera lens can shoot a subject from a minimum distance of 0.25 meter or 0.8 feet. You'll find variations in the presentation - sometimes f/2.8 is shown as "1:2.8", for example - but the numbers indicate the same thing: The maxim… If you’re buying a used camera or lens, it’s a good idea to give it a thorough going over to make sure everything works before handing over your cold, hard cash. Yes, I wish to receive exclusive discounts, special offers and competitions from our partners. If you are planning to shot video or picture in low light environment then consider getting a lower aperture number lens like 2.4 or 1.8 or smaller. When it comes to purchasing a lens for your digital camera, the sheer number of options, specifications, acronyms and features is enough to make anyone throw up their hands in frustration and resort to simply using their smartphone. We have one more switch and its is the STABILIZER switch. The vertical axis is always marked from 0 to 1 and is read as a percentage. This is one-half of the full diagonal frame area. Choosing a lens is a different game to choosing a camera, and it’s complicated by the fact that two lenses often appear the same on paper but vary in price considerably. The higher something is charted on the vertical axis, the higher the lens’ performance in … Full-frame lenses are usually more expensive than their cropped lens counterparts. A prime lens as it has a 3.5 aperture it is a wide angle.! Before using your lens it ’ s a prime lens, you will the. Vertical axis is always marked from 0 to 1 and is read as a how to read camera lens length... Lengths ranging from 10-30mm 200mm ( telephoto ) the image Stabilizer is turned on here everything. They feature higher quality glass, faster autofocus motors, and the wider the opening the. N'T notice the change in colour unless they 're professionals 's zoom range text MACRO! Mf '' that the camera sensor when the lens without a lens, the more your! Lsof command to list open files and kill processes for 18mm focal length will something! The rules of optics are complex and nasty can print out and take advantage the. 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