How to Choose Correct Lens Filter Size

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Katty Ros

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Welcome to the world of photography, where even the smallest accessories can make a huge difference in the quality and creative potential of your photos. Today, I’m Katty, and I’m here to guide you through the process of selecting the correct lens filter for your camera, an essential tool for both novice and experienced photographers alike.

Understanding Lens Filter Sizes

Why Size Matters

The first step in choosing the right lens filter is understanding the size of the lens filter you need. Camera lens diameters are measured in millimeters (mm) and knowing the correct size is crucial for finding a filter that fits your camera perfectly.

Finding Your Lens’ Diameter

Most lenses, including popular models like the Canon 50mm, have their diameters clearly marked. For instance, if you’re using the Canon 50mm lens, you should look for a marking on the lens that indicates its diameter, typically found near the front glass. It might read something like “Ø49,” which signifies that the lens has a diameter of 49mm, and consequently, requires a 49mm filter.

Selecting the Right Filter

Turn the Lens Over

To find this information, you can simply turn your lens upside down. Look around the sides of the lens where the specifications are printed, and locate the diameter symbol followed by a number (e.g., Ø49mm). This number is the key to unlocking the right filter for your lens.

Types of Lens Filters

Once you know the diameter of your lens, the next step is to understand the different types of lens filters available:

  • UV Filters: These protect your lens from ultraviolet rays and help reduce atmospheric haze, which is particularly handy for landscape photography.
  • Polarizing Filters: Ideal for reducing reflections and glare from metallic surfaces or water, and for enhancing the blue of the sky.
  • Neutral Density Filters: These allow you to use wider apertures or slower shutter speeds by reducing the amount of light that enters the camera. They are perfect for creating a motion blur effect in bright conditions.
  • Color Filters: Used primarily in black and white photography, these help in controlling contrast or in adding subtle hues into the frame.

Purchasing Your Lens Filter

Check Specifications Carefully

When purchasing a lens filter, make sure to double-check the diameter to avoid buying the wrong size. Each filter should have the size marked in millimeters, corresponding directly to your lens’ diameter specification.

Where to Buy

Lens filters are available at most camera accessory stores or online. Ensure you purchase from reputable retailers to avoid low-quality imitations that could adversely affect your image quality.


Choosing the right lens filter doesn’t have to be complicated. By knowing your lens diameter and understanding the different types of filters, you can significantly enhance the quality of your photos. Remember, the right filter can protect your lens, improve image quality, and allow you to play with creative effects. So next time you head out with your camera, make sure to bring along the perfect companion for your lens!

Whether you’re just starting out in photography or looking to brush up on the essentials, knowing how to correctly choose and use lens filters is a valuable skill. Don’t forget to check out more tips and tutorials on my channel to become a more proficient photographer. Happy shooting, and I’ll see you in the next article!


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Katty Ros

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