Selecting the Front Glass Sizes - Outex Front Lens

The Outex front glass matches your lens’ filter thread diameter size. The front lens filter thread size is not your focal length or zoom range (See images below). The Outex front glass will thread onto your lens just like an UV filter or polarizer would, and it becomes one with the lens, moving with it and producing the best optical results. The filter thread size is your lens cap size in millimeters, and it's usually printed on your lens - either in the front or on the side, depending on the brand/make/model lens. It's also sometimes marked on the lens protective cap. All Outex front glass is built of professional materials, including American-made glass - not plastic or acrylic - and it's not made in China. Outex offers all of the industry standard sizes, and you can use our drop down menu to look for the matching number on your lens if that helps you.


selecting the front glass for your Outex kit


Selecting the Right Size Outex Front Glass Optical Lens


Selecting the Outex front glass size based on filter thread diameter size


  • Don't confuse the thread size with a lens focal length (and/or zooming range).  In the example below you have a focal length/zooming of 24-105mm and the lens has a 77mm filter thread size.   The other numbers indicate the focal length, F-stop, aperture ranges, etc.
  • All of our font glass solutions work with all/any of our cover sizes, and you can purchase as many as you need to use with the same Outex housing/cover, or kit - same kit, multiple front glass covers.
  • Outex also works with UNthreaded, fixed-hood, or fisheye lenses.  For those you will need an Outex Dome Lens, which like the rest of our system is modular.  Consult our FAQs and NEWS pages for additional information.
  • If still in doubt, search the internet for your exact make & model, then look under specifications for filter thread size. Contact us if you have questions. The Outex system is also compatible with step-up rings, which we also sell in any/all sizes.  Just add it/them to your shopping cart and let us know the sizes you need.  However, we don't recommend stacking step up lenses as it may result in vignetting - especially in wide-angle lenses.  Just get the sizes you need to match each lens to avoid that problem.

Outex front glass size selection based on filter thread sizes

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