Lens Filters

The filter thread size is usually displayed on the front or side of your lens next to this symbol Ø and will look something like Ø77 or 77mm.

Your lens filter size is the diameter of your lens measured in millimeters. But you don’t need to measure it, it’s usually printed on the front or side of your lens next to this Ø symbol. Alternatively, you can find your filter size on the back of your lens cap. Please note that the focal length (e.g 24mm) is not your filter size. You can also search for your filter size by entering the specific lens model and filter size. E.g. “Canon EF 24mm f1.4L USM II filter size” and you’ll see it’s 77mm.

Mainly it’s the quality of the optical glass and the number of nano-coating layers.

Urth has two different ranges of filters: Urth (our premium range) and Urth Plus+ (our professional range). Our Urth range uses premium Japanese AGC optical glass and features an 8-layer nano-coating. Our Urth Plus+ range uses the world’s best optical glass – German SCHOTT optical glass and features a 20-layer nano-coating (our UV Plus+ has 30 layers).

If you’ve invested in a professional-quality lens, we recommend you match its quality with our Plus+ range. Our Urth range is the perfect option for all other standards of lens.

Because telephoto lenses use high quality optical glass, we recommend you use our Plus+ range.

For lenses with a focal length 100mm or greater, we recommend you pair your telephoto lens with the best quality optical glass to allow the best sharpness throughout the zoom range. We recommend fixed ND filters over variable ND filters because it means there are fewer layers of glass over your lens.

All our filters work with wide-angle lenses without vignetting.

Our consciously designed slim rims help avoid any vignetting even with wide angle lenses.

Yes, our filters are double threaded so you can stack filters.

All our filters are double threaded, which means they have back and front threads so you can stack filters of the same thread size. Remember that stacking too many filters together can cause vignetting so we would not recommend stacking more than 2 filters together. Some popular stacking combinations include combining 2 fixed ND filters for a greater ND filter factor, and leaving a UV on your lens and stacking a CPL or fixed ND on top. Remember that you will always get the best image quality with just one filter on your lens.