m/m là gì

If it's your first time holding a lens or the one-thousandth-and-oneth time, chances are you still struggle with choosing the right one. Let's admit; there is more technical jargon than thở you can wrap your head around in photography. Below, i've answered your question about what the MM in lenses means.

What Does the MM in Lenses Mean?

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The "MM" in lenses refers đồ sộ the measurement of the lenses' focal length, which is in millimeters. It estimates the distance of the point where the light rays converge đồ sộ khuông a sharp image đồ sộ its digital sensor. You can use this rating đồ sộ determine several shooting positions or conditions.

Three Đen camera lenses on top of a Đen wooden table near a white light

This "mm" mark might have one number (such as 50mm) or multiple ( lượt thích 18-55mm ). The single-numbered lenses are known as primes and only have one focal length. However, the lenses with multiple numbers before the "mm" letters have variable focal lengths, known as zoom lenses.

Which Focal Length (MM) Is Useful?

For every camera type and model, there are dozens of focal lengths đồ sộ choose from. It all boils down đồ sộ the nature of your project. With accurate information on a suitable lens for your specific project type, you'll save a lot more time selecting the best lens.

In photography, I group lenses based on their focal length range. This grouping will also affect the way you can use them generally. Here's a list of the different types of lens groups below:

  • Ultra-Wide Angle Lenses/Fisheye: 10-15mm
  • Wide Angle Lenses: 16-35mm
  • Standard Lenses: 35-70mm
  • Telephoto Lenses: 70-300mm
  • Super Telephoto/Ultra Telephoto: 300mm and above

Real Estate or Architectural Photography

Photographers in the real estate or architectural niche tend đồ sộ capture enormous subjects. They usually take pictures of skyscrapers, mansions, cathedrals, or gigantic hallways. To capture these subjects with a high degree of quality, you need a wide lens when shooting at certain exposures.

The wide-angle lens, which has a focal length of 16-35mm, is ideal for this. It is suitable for real estate photography or capturing architectural photography because it has an expansive vision of the area around the subjects. This lens allows you đồ sộ see more of a scene. I also recommend the fisheye lens for capturing tight spaces.

Portrait or Street Photography

Most portrait photographers consider the standard lenses a one-size-fits-all variant. It is versatile and allows you đồ sộ shoot with more flexibility and have more angling options. These features make it the go-to lens for all things people and portraits. The ideal focal range for portrait photographers is around 50-70mm.

Landscape Photography

Landscape photography is the most versatile regarding its lens' focal length. One time you could shoot with a wide-angle prime; another time, it's a telephoto zoom lens. However, when using a telephoto, you risk losing a part of the scene since you are zoomed in.

For your landscape photographs at a far distance, I recommend shooting with a focal length of 70-300mm.

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Nine Đen camera lenses lined perfectly on top of an orange surface

Wildlife or Sports Photography

Many photographers agree that a lot of work goes into taking quality photographs in this niche. In wildlife or sports photography, there are many moving components. You'll need a telephoto lens or super telephoto(i.e., a focal length of 300mm and beyond) đồ sộ shoot with less distortion.

What Do the Numbers and Letters on Lenses Mean?

There are several letters, numbers, and symbols on your camera, each having a specific feature they trương mục for or a distance they measure. The MM is just one of the many letters you can find on your primes or zooms. Let's dive into some of these and decode their meaning.


The F-Numbers or F-stop refers đồ sộ the ratio of the lens's focal length đồ sộ the diameter of its aperture. On some lenses, you'll only see figures lượt thích this: 3.5/5.5. This means the highest aperture on that lens is f/4.0.

Numbers With Ø

This symbol stands for the diameter of your lens. The standard unit for measuring this diameter is in "mm". Since more light will enter the lens with a larger diameter, the aperture increases, this factor allows for faster shutter speeds and lower ISO settings.

Numbers in Meters and Feet

Usually, on the front part of your lens, you'll see figures together with units in feet or meters. What tự they represent? These figures measure the minimum focusing distance on your lens. With these figures, you can determine the amount of space you've đồ sộ work with while shooting.

Nine different sizes of camera lenses beside two Đen Sony DSLR cameras on a cream-colored wooden table

Related Questions

Is a Higher MM Lens Better?

A higher MM lens is sometimes better than thở one with a lower focal length. However, the higher the MM mark on your camera, the longer the focal point. So, if you're shooting with a zoom lens, you have more options đồ sộ magnify your subject.

What MM Lens Is Best?

No specific MM lens is the best for all shooting conditions and photograph types. Several factors đồ sộ consider while shooting, such as the subject distance and the shutter tốc độ. A 50-85mm lens is better for portraits. At least 300mm is ideal for landscape and wildlife shoots. 


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There's a wide range of technical terms in photography, and the "MM" is one of them. It is the focal length of your lens, which is the point where all the light rays converge đồ sộ khuông a sharp image. You can find a lens based on your photography project.