What Does MM Mean On Camera Lens

What Does MM Mean On Camera Lens?

If you’ve ever walked into an electronics store and seen camera lenses labeled in millimeters, you might be curious about what does mm mean on a camera lens?

Actually, the term mm refers to millimeters which are the standard unit of measurement in the photography industry and are used to measure the focal length of your camera lens. It can also be measured in inches or centimeters, depending on where you purchased your lens.

However, millimeters are an easy way to measure the length of camera lenses, making it easier to identify which model of lens you should purchase and easier to compare lenses from one manufacturer to another.

If you want to know more about what mm means on the camera lens, read on for a complete explanation!

What Does MM Mean On Camera Lens?

MM Mean On Camera Lens

As I mentioned in the introductory paragraph, MM stands for millimeters, which is the standard unit of measurement in the photography industry used to measure the focal length of your camera lens.

The distance between the lens and the camera’s sensor is known as a lens’ focal length. A normal camera lens has a focal length of 50mm and is photographers’ most often used lens.

This focal length is ideal for portraits, landscapes, and general photography. 35mm, 24mm, and 16mm are other common focal lengths for camera lenses.

Keep in mind that the view range increases with decreasing focal length and vice versa.

Why are Camera Lenses Measured in MM?

Have you ever wondered why camera lenses are measured in millimeters? It turns out that this has a pretty easy explanation. Millimeters are a unit of measurement that is used to describe the physical size of objects. And since camera lenses vary in size, they are typically measured in millimeters.

But why not use other units of measurement, like inches or centimeters? The answer has to do with the history of photography. In the early days of photography, camera lenses were made of glass. And since glass is measured in millimeters, that’s how lenses were measured as well.

As photography evolved, different materials were used to make lenses. But the tradition of using millimeters to describe lens size has remained.

What Does MM Mean On Zoom Lens?

MM Mean On Zoom Lens

When you zoom in and out of a zoom lens, the focal length changes, however, zoom lenses will always have two numbers on them – the wide-angle side lens and the telephoto side of the lens.

For example, a zoom lens might have 24-105mm focal length. The first number represents the lens’s wide-angle length, while the second represents the lens’s telephoto length.

The lens’s focal length will change as you zoom in and out of the lens, but these numbers will remain the same. If you see only one number on a zoom lens, the manufacturer has combined the wide-angle and telephoto lengths into one number.

For example, a zoom lens might have a focal length of 18-55mm. This zoom lens combines the wide-angle and telephoto lengths into one number, so you will only find one number on the lens.

Is A Higher MM Lens Better?

A higher mm lens is not necessarily better but will give you a different perspective. For example, a 50mm lens is considered a “normal” lens because it shows objects approximately how we see them with our own eyes.

A 100mm lens is considered a “telephoto” lens because it makes objects appear closer than they actually are.

Therefore, a higher mm lens would be beneficial if you wanted to take a photo of anything far away. However, a lower mm lens would be better if you want to take a picture of something up close.

Which Lens Should I Buy?


If you want to know what mm means in a camera lens, the best way to purchase a new camera lens is to figure out what type of photography you will be doing and then purchase the lens that best meets your needs.

If you’re interested in portrait photography, you’ll want a standard lens with a focal length of 50mm.

On the other hand, if you want to shoot landscapes, you’ll want a standard lens with a focal length of 35-40mm.

A normal lens with a 200mm focal length is ideal for photographing wildlife.

If you’re unsure what lens you should purchase, try to take note of the type of photography you do most often, and then purchase a lens that meets your needs. This will help you avoid purchasing a lens you don’t need.

Why Is 35mm So Popular?

Because of their large field of vision and narrow depth of focus, 35mm camera lenses are popular. This enables photographers to catch a diverse range of subjects in a single frame, resulting in photographs with a unique aesthetic.

Furthermore, 35mm lenses are generally affordable, making them an excellent choice for cost-conscious photographers.

Moreover, because they are small and lightweight, they are easy to carry around, making them ideal for travel photography.

What Does the F-Number Mean On a Lens?

F-Number Mean On a Lens

A lens’s f-number determines its ability to gather light.It is determined by dividing the focal length by the aperture diameter of the lens. The lens catches less light and produces sharper images as the f-number decreases.

What Is F-Stop in Photography?

The term “f-stop” is a very important factor in photography. It is the measure of your camera’s aperture size. The aperture of your lens is the opening through which light can travel to reach the sensor. Obviously, more light can pass through an aperture as it gets bigger.

The f-stop setting is a fraction. The number at the top indicates the focal length of your lens. The number on the bottom is the diameter of your aperture. So, if you have a 50mm lens with an aperture of f/2.8, your f-stop would be 2.8/50=0.056.

Low f-stop values are helpful in low-light situations, and high f-stop values are advantageous in bright surroundings when you want a lot of depth of field.

What 2 Lenses Should Every Photographer Have?

As a photographer, you know that lenses are key to getting the perfect shot. But with all the different types and brands of lenses available, it can be tough to choose which ones you need. So, what two lenses should every photographer have?

Any photographer should own a telephoto lens. It allows you to get close-up shots of your subject without being too close, which can be ideal for wildlife or sports photography. Plus, a telephoto lens can also be used for portraits, landscape shots, and more.

The wide-angle lens is another crucial piece of equipment for photographers. This lens is perfect for capturing large crowds or wide landscapes. It may also be utilized for architectural photography and other sorts of photos where a lot of information has to be captured in a single frame.

What Is the Difference Between 200mm and 300mm Lens?

The main difference between 200mm and 300mm lenses is their focal length. A 200mm lens has a focal length of 200mm, while a 300mm lens has a focal length of 300mm. This means a 200mm lens will have a wider field of view than a 300mm lens.

Because the 200mm lens has a shorter focal length, it can catch more of the scene in front of it.

The shorter focal length also makes the 200mm lens better suited for taking wide-angle shots, while the longer focal length of the 300mm lens is better for taking telephoto shots.

What Are the Best Lens for General Photography?

Lens for General Photography

For general photography, a good all-purpose lens is a 50mm prime lens. This will give you a decent field of view and allow you to take both close-up and wide shots.

If you have a DSLR camera, another option is to buy a kit lens which usually includes an 18-55mm or 18-105mm zoom lens. These are great for getting started in photography as they give you a lot of flexibility.

What Is Better for Street Photography 35mm or 50mm?

Some people prefer the wider field of view that a 35mm lens offers, while others find the extra reach of a 50mm lens useful. Ultimately, it comes down to what you feel comfortable shooting with and what you think will help you capture the best photos.

If you’re just starting street photography, a 35mm lens may be a good option, as it will give you a wider field of view to work with. When attempting to capture a scene or surroundings and not want to miss anything, this might be useful.

A 50mm lens may be a better choice if you’re looking to focus more on individual subjects and don’t mind sacrificing some of the wider fields of view.


The focal length of a camera is the distance between the lens and the sensor that controls the field of vision. If you want to get a new lens, you’ll need to understand what mm means on a camera lens.

Simply look at the camera lens’s side and identify the ‘mm’ marking. This displays the focal length of the lens you are now using. I suggest you never underestimate the power of mm but keep in mind that different sizes of lenses are used for different purposes.

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