(Note that some zoom lenses have a variable maximum aperture, where the maximum aperture will change depending on the focal length; this is represented as a range of numbers, such as f/3.5-6.3.)

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So at one end of the scale, you’ll find the infinity symbol, and at the other end, you’ll find the lens’s minimum focusing distance (i.e., the closest the lens can focus).

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Most newer lenses set and control the aperture through the camera. But back in the days of film, you would set the shutter speed on your camera and the aperture on the lens (via an aperture ring).

These variable maximum apertures are pretty common with kit lenses, and especially kit lenses with a large focal length range such as 28-300mm or 18-200mm.

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And if there are any lens numbers I missed, don’t worry – just share pictures in the comments below, and I’ll see what I can do to help out!

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Note that some modern lenses do include aperture rings; Fujifilm is known for this, as are other brands that offer manual focus lenses (e.g., Samyang).

You’ll find the lens diameter written on the end of your lens (often on the edge of the barrel), preceded by a symbol that looks like a zero with a strike through it:

Camera lens mmchart

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In the photo below, you can see two different lenses: my Tamron 17-35mm and my Canon 85mm. On the Tamron, you should see “1:2.8-4,” and on the 85mm, you should see “1:1.8.”

Camera lensdistance chart

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Most zoom lenses don’t offer hyperfocal distance scales (because depth of field varies with focal length). But if you have a prime lens – especially an older model – you may see an extra ring of numbers on the barrel, such as in the image below:

CameraSize comparison withlens

So for the lens pictured above, the diameter is 77mm. And if I wanted to use a polarizing filter or a clear filter, I’d need to grab one with an equivalent diameter.

That’s why, in this article, I’m going to run through all the important camera lens numbers you’ll encounter. I’ll explain what the numbers actually mean, and I’ll also explain why they matter for your photography.

Every lens has a diameter, the distance across the center of the lens. This diameter also corresponds to the filter size (if the filter’s diameter doesn’t match the lens diameter, it won’t properly screw onto the front of the lens).

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Check out the two lenses below. The distance scale on the 70-200mm (left) is under a cover, and you can see that the lens is focused somewhere between 10 meters and infinity. The distance scale on the 17-35mm (right) is on the lens’s focus ring, and you can see that the lens is focused quite close, at around 0.5 meters.

Larger apertures like f/2.8 or even f/1.8 are highly desirable because they allow you to shoot in low-light conditions while maintaining a fast shutter speed. So the best lenses – and the most expensive lenses – tend to offer a very wide maximum aperture.

focal length是什么

What is focal length oflens

By the time you’re finished, you’ll be a lens number expert, and you’ll never find yourself confused by your lens markings again.

A lens will never display every focal length but will instead offer a few useful intervals, as you can see in the image above.

Depending on the age of your lens, you’ll run into different markings. In this section, I’ll discuss numbers frequently found on newer lenses (though note that many will apply to old lenses, as well!).

If you are using a prime or fixed lens, you won’t have a zoom ring. Your lens will simply indicate the focal length on its barrel, as you can see on my 85mm lens:

What does this mean? It’s simple: the maximum aperture on the 85mm lens is f/1.8, and on the Tamron zoom, the maximum aperture changes from f/2.8 to f/4 as you zoom the lens. (At the lens’s widest, 17mm, I can open the aperture to f/2.8. But if I zoom all the way to 35mm, my maximum aperture becomes f/4.)

Next to this ring, you’ll generally find focal length numbers. For example, if your lens is a 70-200mm zoom like mine (below), you’ll see markings that span from 70mm to 200mm. I’m currently at around 100mm:

First, focus your lens and set your aperture. Then look at the hyperfocal distance scale and find your chosen aperture on either side of the red line. Finally, look at the focusing distances that correspond to the apertures – these will be your near and far depth of field limit.

Focal lengthcamera

So while newer lenses rarely include aperture rings, you’ll find them on plenty of older lenses. An aperture ring displays different aperture settings, like this:

CameraFOV calculator

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And this is by design. The hyperfocal distance scale uses the distance scale to display the expected depth of field. Here’s how it works:

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The maximum aperture is the largest aperture opening your lens is capable of achieving. Note that the larger the aperture opening, the smaller the f-number (so f/2.8 corresponds to a very wide aperture, while f/22 corresponds to a very small aperture).

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Well, that’s it for lens numbers! Hopefully, you now feel much more confident (and much less confused) when looking at your lens.

On some – but not all! – lenses, you will see a range of distances, usually marked in two scales, feet and meters. These lens numbers indicate the distance at which your lens is currently focused.

Now, pretty much every lens has the maximum aperture written somewhere on its body. You can usually find this information in one of two places (or perhaps even in both):

Now that you’re familiar with all the common camera lens numbers, let’s take a look at some of the less common markings. These numbers are pretty rare on lenses designed for digital cameras, but you may come across them if you purchase older, manual focus glass.

A hyperfocal distance scale helps you determine the depth of field for a scene, given a particular focal length, point of focus, and aperture.

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