If you lost the original lens cap or bought a second-hand lens without it, you must look for one right away. It is an essential accessory for your camera lens because it protects the glass from scratches and damage. “What size lens cap do I need?” is probably just one of your questions, which we will answer below.
To determine the correct lens cap size, you must know the lens diameter. You can check the lens barrel, product manual, or the manufacturer’s website to learn more information about the camera lens.
If the above methods do not work, you can also measure the diameter manually. This article will cover different ways to find the correct lens cap size for your gear.
What Size Lens Cap Do I Need?
The lens cap size of your gear varies depending on its specific model. If you want to know which front cap fits your lens, you must find the lens diameter. It simply refers to the measurement of the front part or the filter thread of the camera lens. It is expressed in millimeters (mm).
Besides the front lens cap, the diameter also determines the size of rear lens caps, filters, hoods, and other accessories you can attach to the lens.
How Do I Know My Camera Lens Cap Size?
Knowing the lens diameter is key to finding the correct camera lens cap size. Here are easy ways to find this measurement.
Find the Lens Diameter on the Barrel
Most camera lenses display the lens diameter on the lens barrel or the front of the lens where the filter thread is located. The diameter is often accompanied by an “Ø” symbol. So if you see these two figures together, know that they represent the lens diameter in millimeters.
For example, if the lens has Ø 67, the number indicates the diameter. You must look for a front lens cap with the same 67mm diameter to ensure compatibility with your DSLR lenses.
Look at the Product Manual
If your camera lens lacks an imprint on the barrel or filter threads, you can consult the user manual. You will find thorough information about the camera lens, including its focal length and diameter. As soon as you know this detail, you can go ahead and buy a protective lens cap.
Those who do not have access to the product manual can search for their camera lens online. Check the manufacturer’s website to know the right size lens cap.
Measure the Diameter Manually
If you tried the above methods and still cannot find the lens cap size information, you can measure it manually.
Use a ruler or a caliper with millimeters on it. Measure the widest part of the lens by going through the middle of the lens. Start from the threaded area on one side to the same area on the opposite side. The number you will get will be the diameter of the lens cap you must look for.
Are Lens Caps Interchangeable?
In general, lens caps with the same diameter are interchangeable. That means if you have a 77mm lens, you can use its front cap on another lens with a 77mm diameter.
However, front lens caps are not always interchangeable. For instance, if you own a compact camera with the same lens diameter, you are unable to attach a cap or any accessory. The reason is this camera already has a built-in lens cover.
You will also be unsuccessful if you use a too-small or too-large lens cap for your lens. You can even compromise the safety of your gear if the cap does not fit snugly.
Are All Lens Caps The Same Size?
Camera lens caps do not come in a universal size. They have varying diameters depending on the lens they are designed for.
Lens caps also come in different sizes based on lens type, the camera system, and various models within the same product lineup.
Before purchasing a front lens cap, ensure it has the same filter diameter as your lens. You can refer to the lens barrel, user manual, or manufacturer’s website. You can also measure the lens diameter manually.
Can I Use A Lens Cap From A Different Brand On My Camera Lens?
Suppose you have several lenses from different camera brands. You might be curious if you can use the lens cap of your one lens for another model.
The answer is usually yes, as long as these lenses have the same diameters.
Camera manufacturers often use the same thread specs—the only difference is the diameter. So if the lens from brand A has the same diameter as brand B, the cap can be used interchangeably.
Let us take the Canon EF 50mm f/1.4 USM and the AF-S NIKKOR 50mm f/1.4G as examples. Both lenses have a 58mm diameter or filter size. As such, you can use the Canon lens cap for the Nikon lens and vice versa.
What Are The Common Lens Cap Sizes Available In The Market?
Here are some popular lens cap sizes and their respective diameters:
Smaller and larger cap sizes are also available for specialty lenses and camera systems.
The lens cap is an essential accessory to protect your gear from scratches and other damages. Before purchasing one, you must consider its size and ensure it fits your lens.
To determine what lens cap size you need, you must know the exact diameter of your lens. You can check the barrel, user manual, or the manufacturer’s website. You can also measure the diameter on your own using a ruler or caliper.
Do you have more questions about the physical measurement of your front lens cap? Feel free to send your queries via our contact page!