Image Stabilization (IS - Canon) and Vibration Reduction (VR - Nikon) is a lens technology designed to reduce the effect of camera shake. They are the same thing, but each manufacturer uses different terminology. USM = Ultrasonic Motor and HSM = Hypersonic Motor. These letters tell you what type of Autofocus motor is in your lens. Popular lenses are often improved with a newer version and updated features so they can be sold again to photographers who want to upgrade. This means it is the second generation of that particular lens. Sometimes, you will see II at the end of the lens name/description. Here's an example of what the diameter sign looks like on a lens:Īs you can see, this Sigma lens has a 67mm diameter therefore, if you are looking for filters or a new lens hood, you would need to make sure you are purchasing ones that fit a 67mm diameter lens. Not all lenses have the same diameter, and knowing the diameter of YOUR lens is essential when purchasing lens filters and lens hoods. So when you see this symbol followed by a number, it refers to the diameter of your lens. The circle with a line through it is a diameter symbol. This switch will allow you to change your lens from Autofocus to Manual focus: On the side of your DSLR lens, you will see the letters AF/MF (Canon) or M+A/M (Nikon) with a small white line and switch beneath. So, for this lens, when zoomed out at 10mm, the widest aperture is f/3.5, but when zoomed in to 22mm, the widest possible aperture is f/4.5: The aperture changes with the zoom's focal length between f/3.5 and f/4.5. ![]() In some cases with zoom lenses, you will see two numbers following the "1:", as in the example below, which shows an aperture range of 1:3.5-4.5. In this case, the numbers read 1:2.8, which means that this 24-70mm lens has a wide-open aperture of f/2.8: The smaller the number, the wider the opening (which lets in more light). When you see a 1: followed by a number, this represents the lens's maximum aperture or how wide the opening on your lens is when you take a photo. If any of this is confusing, you can read much more about focal length here: You can use this lens at its widest angle (18mm), the most zoomed (55mm), or anywhere between 18mm and 55mm. The pair of numbers refers to the focal length range or that particular lens. Let's look at an 18-55mm lens as an example. The higher the focal length (larger number), the less you will see in your image (more zoomed in).The lower the focal length (smaller number), the more you will see in your image (wider view).So when you see "mm" following a number or a pair of numbers on a lens, you will know that the number refers to the focal length (single number) or focal range (pair of numbers).įocal length is what you see when you look through your camera viewfinder. Millimeters, or "mm" for short, is the standard unit of measurement for the focal length of a lens. In this post, I will show you a few examples of standard lenses and explain some of the most important numbers and letters you have on your lens. They may seem complicated at first, but its really easy to understand once explained. ![]() If you are new to photography, you might find yourself wondering what all of the different numbers, letters, and symbols on your camera lens mean. What Do the Numbers, Letters, & Symbols on a Camera Lens Mean? How to Sync Lightroom Presets from CC to Mobile How to Install Presets in the Free Lightroom Mobile App
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