What Does Mm Mean In Camera
What Do the Numbers, Letters, & Symbols on a Camera Lens Hateful?
If y'all are new to photography, you might find yourself wondering what all of the unlike numbers, letters, and symbols on your camera lens mean. They may seem complicated at offset, but its really easy to empathize once explained.
In this post, I volition prove you a few examples of standard lenses and explicate some of the most of import numbers and letters you lot take on your lens.
What Does eighteen-55mm Mean?
Millimeters, or "mm" for short, is the standard unit for the focal length of a lens. So when yous see "mm" following a number or a pair of numbers on a lens, y'all will know that the number refers to the focal length (unmarried number) or focal range (pair of numbers).
Focal length is what you see when you look through your photographic camera viewfinder.
- The lower the focal length (smaller number), the more you will come across in your prototype (wider view).
- The higher the focal length (larger number), the less you will see in your image (more than zoomed in).
Let'southward wait at an 18-55mm lens as an case. The pair of numbers refers to the focal length range or that particular lens. You lot can apply this lens at its widest angle (18mm), the most zoomed (55mm), or anywhere betwixt 18mm and 55mm.
If any of this is confusing, you tin can read much more about focal length here:
Hither is a 24-70mm lens:
And an 85mm lens:
What is 1:two.8?
When you lot see a 1: followed by a number, this represents the lens's maximum aperture or how broad the opening on your lens is when you lot take a photograph. The smaller the number, the wider the opening (which lets in more than light).
In this case, the numbers read 1:2.8, which means that this 24-70mm lens has a broad-open aperture of f/ii.eight:
What is 1:3.five-4.v?
In some cases with zoom lenses, you will see ii numbers following the "one:", as in the example below, which shows an aperture range of 1:3.5-4.5. The discontinuity changes with the zoom's focal length between f/3.5 and f/4.five.
And then, 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/iv.five:
You can learn MORE most aperture here:
What is AF / MF?
On the side of your DSLR lens, you lot will encounter the letters AF/MF (Catechism) or M+A/Thou (Nikon) with a pocket-sized white line and switch beneath. This switch will allow y'all to change your lens from Autofocus to Manual focus:
What is Ø67?
The circle with a line through it is a bore symbol. And so when you see this symbol followed by a number, it refers to the bore of your lens.
Non all lenses have the same diameter, and knowing the diameter of YOUR lens is essential when purchasing lens filters and lens hoods.
Here's an case of what the diameter sign looks like on a lens:
As you tin see, this Sigma lens has a 67mm diameter; therefore, if you lot are looking for filters or a new lens hood, you lot would need to make sure you lot are purchasing ones that fit a 67mm diameter lens.
What is "II"?
Sometimes, y'all will see II at the end of the lens name/clarification. This means it is the 2nd generation of that item lens. Popular lenses are ofttimes improved with a newer version and updated features so they can be sold again to photographers who want to upgrade.
What is USM / HSM?
These messages tell you what type of Autofocus motor is in your lens. USM = Ultrasonic Motor and HSM = Hypersonic Motor. They are the same thing, but each manufacturer uses different terminology.
What is IS / VR?
Epitome Stabilization (IS - Canon) and Vibration Reduction (VR - Nikon) is a lens engineering science designed to reduce the consequence of camera shake. Not all lenses come equipped with this engineering, merely you volition know if your lens does if you see the abbreviations "IS" or "VR" well-nigh the glass on the lens or yous run into "Image Stabilization" or "Vibration Reduction" on the body of the lens.
Other Lens Abbreviations
The number, letters, and symbols described above are the most common, only there are plenty of less common abbreviations used by different lens manufacturers.
In general, the letters on the lens are simply used to describe specific features, such equally the type of technology the lens uses, the type of camera to which the lens can be mounted, or the grade of the lens.
Canon uses abbreviations such as EF and EF-Due south, while Nikon uses AF and AF-Due south to depict their lenses.
If yous are unsure what whatever of those other abbreviations mean, a quick Google search should tell yous exactly what you lot have.
Do yous have any questions or comments nigh Understanding Your Lens? Leave usa a comment below - we would Dear to hear from you! And Please SHARE our tutorial using the social sharing buttons (nosotros really appreciate it)!
Source: https://www.lightroompresets.com/blogs/pretty-presets-blog/understanding-camera-lens-numbers-letters-symbols-explained
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