Lens Aperture Ring: Manual Control and Click Stops

What is an aperture ring?

An aperture ring is a control on the lens barrel that adjusts the size of the diaphragm opening. Turning it changes the f-number, which controls how much light reaches the sensor and how much of the scene appears sharp. It is one of the oldest and most direct ways to set exposure, predating electronic camera interfaces by decades.

On lenses with a mechanical aperture ring, the ring is often marked with f-stops such as f/2.8, f/4, f/5.6, f/8, and so on. Between marked stops, you may find half-stop or third-stop detents. When you turn the ring, the diaphragm blades open or close in steps, giving you precise, repeatable settings without looking at a screen.

Many modern mirrorless lenses, especially those designed for autofocus systems, omit the ring entirely and rely on a camera body control dial. However, a physical aperture ring remains a favorite among photographers who want direct, tactile control or who use adapted vintage lenses. For a refresher on how aperture relates to exposure and depth of field, see our aperture explained article.

Click stops: precise and audible

Click stops are the detents you feel and hear when turning an aperture ring. Each click corresponds to a fixed change in f-stop, usually half or one stop. In still photography, clicks are valuable because they give you a positive mechanical confirmation that you have moved the aperture by a known amount.

Click stops also help when you need to make the same adjustment repeatedly, such as when shooting a series of portraits with consistent depth of field. You can count clicks to move from f/4 to f/5.6 or to f/8 without looking at the lens. This is especially handy in low light where reading markings is difficult.

The downside of click stops appears in video. If you are recording audio with a built-in or external microphone, the sound of each click may be picked up. Even without audio, a stepped change in exposure is often visually jarring in a continuously moving shot. For these reasons, many video-oriented lenses and cine lenses use a de-clicked aperture ring.

De-clicking: smooth aperture for video

A de-clicked aperture ring has no detents; it rotates smoothly through the f-stop range. This allows you to change the aperture gradually, without steps, which is essential for smooth exposure adjustments during video recording. You can brighten or darken the image continuously as the scene changes, mimicking a cine lens.

Some lenses come with a switch that lets you toggle between clicked and de-clicked modes. Others require modification, such as removing a ball bearing or a spring, which is usually done by a technician. If you shoot both stills and video and want one lens for both, a lens with an aperture ring that can be de-clicked is a practical choice.

For pure stills, a de-clicked ring is less useful because you lose the tactile feedback of exact stop changes. You may overshoot or undershoot the intended setting. If you mainly shoot photos, a clicked ring is typically more efficient. If you mix photo and video, think about how often you need smooth exposure transitions. The choice depends on whether you prioritize silent, stepless control or precise, repeatable steps.

Compatibility with camera bodies

Whether an aperture ring works as intended depends on the lens mount and the camera body. In systems that use electronic aperture control, such as many modern mirrorless mounts, the lens ring may send a digital signal to the body, which then moves the diaphragm. In that case the ring is not mechanically linked to the blades, but it still provides the physical control you want.

In other systems, the aperture ring is purely mechanical. This is common on older manual-focus lenses and on some cine lenses. When you adapt such a lens to a modern camera via a lens mount adapter, the ring will still work, but you may have to set the camera to a specific mode, such as aperture-priority or manual, to meter correctly. Some adapters also include a mechanism to control the aperture from the camera body, but that is only possible if the lens has electronic contacts.

The Micro Four Thirds system is an example of an open standard that allows lenses from different manufacturers to work on compatible bodies. According to the standard's official description, it is built for freedom to combine camera bodies and interchangeable lenses beyond manufacturers' boundaries. In practice, this means you can often use a lens with a physical aperture ring from one brand on a body from another, as long as the mount is physically compatible and the firmware supports it.

Not every camera body supports aperture rings equally. Some entry-level bodies may lack a dedicated control dial, making a lens with an aperture ring the primary way to change f-stop. Others, like many full-frame mirrorless models, assume you will use the front or rear dial. If you are buying a lens specifically for its aperture ring, check that your camera body can read the aperture value and that you can operate in a mode that gives you priority over shutter speed. For more on how aperture and shutter work together, see the exposure triangle explained article.

Choosing a lens with an aperture ring

If you are deciding between lenses, first decide what you value: speed of adjustment, repeatability, or smoothness in video. For street and documentary work, a clicked ring lets you set f/8 quickly without taking your eye from the viewfinder. For video production, a de-clicked ring gives you the latitude to ride the exposure as the light changes.

Lens construction also matters. Some aperture rings are damped with grease for a silky feel; others have a looser rotation that can be moved accidentally. If you carry the camera on a strap, a ring that is too loose might change the f-stop when the lens brushes against your body. Look for a ring with noticeable resistance, or lock it when not in use.

Another consideration is the number of aperture blades. A lens with a rounder diaphragm opening (often due to more blades) gives smoother bokeh and more pleasing highlights, which is separate from the ring itself but related to the aperture mechanics. See our article on lens aperture blades and bokeh for more.

Finally, think about the long term. A mechanical aperture ring with no electronic linkage is generally simpler and less likely to fail than a ring that relies on motorized control. If you plan to adapt lenses across systems, a mechanical ring gives you predictable behavior on any body that can meter. This matters if you are choosing between a mirrorless camera and a DSLR, as the two have different heritage in aperture control.

Aperture ring vs camera dial

Modern camera bodies often place aperture control on a dial near the shutter button. This is ergonomic when your hand is already on the grip. But it requires you to look at the screen or viewfinder readout to know which f-stop you have selected. An aperture ring, by contrast, shows the setting on the lens barrel, so you can check it even when the camera is off.

There is also a difference in the speed of changing aperture. A ring can be turned from f/2.8 to f/11 in one motion, while a dial may require several rolls of the thumb. For fast-changing situations, such as street photography or events, a ring can be more efficient. For precise third-stop adjustments, a camera dial with a clear readout is often more accurate.

Some photographers prefer a hybrid approach: set the aperture ring to a specific stop and then use exposure compensation to fine-tune. This works well in aperture-priority mode, where you control depth of field directly and let the camera choose the shutter speed. Others set the camera to manual and use the ring as the primary control, relying on the meter display for guidance.

What to pick for your use

Questions

Is an aperture ring necessary on a modern mirrorless lens?

No, it is not necessary. Many mirrorless lenses use a body dial for aperture control, which works well. A ring adds convenience and a direct feel, but it is a preference, not a requirement.

What is the difference between clicked and de-clicked aperture rings?

A clicked ring has detents at each f-stop, giving tactile and audible feedback. A de-clicked ring rotates smoothly without stops, which is useful for video to change exposure gradually without the risk of clicks in the audio.

Can I de-click an aperture ring myself?

Some lenses have a switch to de-click the ring. Others require disassembly to remove a detent spring or ball, which is best done by a qualified technician to avoid damaging the lens.

Will an aperture ring work when I adapt a lens to a different camera mount?

If the lens has a purely mechanical aperture ring, it will work as long as the adapter gives the correct flange distance and you can focus and meter. If the lens uses electronic aperture control, you need an adapter with compatible electrical contacts. See our lens mount adapters guide.

Why do some lenses have no aperture ring at all?

Many autofocus lenses, especially for mirrorless systems, rely on the camera body to control the aperture electronically. This reduces the lens size and production cost, and it integrates smoothly with the camera's exposure system.

Does the number of aperture blades matter if I use a ring?

Yes, but separately. The ring controls the f-stop, while the blade count affects the shape of the opening at middle apertures and the quality of bokeh. A lens with more blades often has a rounder opening, which is desirable for smoother out-of-focus highlights.

What is the best aperture ring setting for street photography?

A common choice is around f/5.6 to f/8, which gives a moderate depth of field so that you can keep most of the scene in focus while isolating the subject enough. The exact setting depends on the light and your distance to the subject.