Quick answer

Check the diameter printed on your lens barrel or inside the front cap—that number in millimeters is your filter thread size. Buy the Tiffen UV filter that matches it exactly; never guess or size up.

Why filter size must match your lens thread exactly

A UV filter screws into the threads at the front of your lens. If the diameter is off by even a millimeter, the filter will not seat properly and can bind, cross-thread, or fall off. Tiffen offers filters in many diameters, including 30.5mm, 72mm, and 86mm, so the key is identifying your lens's thread size before you shop.

Step-up and step-down rings can adapt a filter to a different lens size, but they add bulk and can cause vignetting on wide-angle lenses. For a protective UV filter you plan to leave on, matching the native thread is the simplest and safest choice.

When a larger filter makes sense (and when it doesn't)

If you own several lenses with different thread sizes, you might buy one large filter and use step-up rings on smaller lenses. This can save money on premium filters like the 86mm UV17, but it means the filter will not fit smaller lenses without the correct ring, and the ring must be removed each time you switch lenses.

For most photographers, buying a dedicated filter for each frequently used lens is more convenient and avoids light leaks or mechanical stress. The 72mm UV Haze 1, for example, is a common size for many standard zooms and makes a practical dedicated choice.

Step-by-step: find your filter size and choose the right Tiffen UV filter

  1. Locate the thread size marking: Look for a number followed by 'mm' or a Ø symbol printed on the front of the lens barrel, often near the filter ring, or inside the front lens cap. If you can't find it, check the lens manual or the manufacturer's website. Do not measure the glass element—measure the thread diameter. A ruler across the front glass will give the wrong number.
  2. Verify the size with a second source: Cross-check the printed number against your camera's menu (some cameras show lens info) or the lens specification online. If the number is worn off, search your exact lens model plus 'filter thread size'. A common mistake is assuming all lenses of a brand share the same size. Always confirm per lens.
  3. Match the size to a Tiffen UV filter: Choose the Tiffen UV filter with the same millimeter diameter. For example, a lens marked 72mm takes the Tiffen 72mm UV Haze 1; an 86mm lens takes the 86mm UV17; a 30.5mm thread takes the 30.5mm UV. If your size falls between listed options, do not round up or down—look for a filter in your exact size or use a step-up ring only if you accept the trade-offs.
  4. Decide between UV Haze 1 and UV17 (if both are available in your size): UV Haze 1 absorbs more UV light and is a general-purpose choice for most outdoor shooting. UV17 absorbs slightly less UV and suits those who want a lighter touch. Both protect the lens. Check that the filter you want is offered in your exact thread size before committing to a series.
  5. Test the fit before relying on it: Screw the filter on gently by hand until snug—do not overtighten. It should turn smoothly without forcing. If it binds, stop and check that the size is correct; cross-threading can damage lens threads. Keep the filter on for protection, but remove it if you notice vignetting on wide-angle lenses or difficulty focusing.

Tiffen UV filters in different sizes

  • Tiffen 86mm UV17 Lens Filter: 86mm UV17 filter absorbs slightly less UV light than Haze 2A and can be kept on the lens at all times. Ideal for technically minded shooters who want consistent UV control without excessive filtration, provided your lens has an 86mm thread.

    Tiffen 86mm UV17 Lens Filter

    Tiffen 86mm UV17 Lens Filter

  • Tiffen 72mm UV Haze 1 Lens Filter: 72mm UV Haze 1 filter absorbs almost three quarters of UV light and is described as best general-purpose UV control. A strong all-rounder for reducing bluish haze in most situations, and a common thread size for many zoom lenses.

    Tiffen 72mm UV Haze 1 Lens Filter

    Tiffen 72mm UV Haze 1 Lens Filter

  • Tiffen 30.5mm UV: 30.5mm UV filter provides basic UV reduction and protects against dust, moisture, fingerprints, scratches, and damage. A cost-effective protection option for compact cameras or lenses with small 30.5mm threads.