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Universal Adapter Sizing Chart

The Universal Adapter Sizing Chart (UAC) helps you find the right adapter for the job. 


Measure the outside diameter of your diopter and/or your objective housing using an accurate measurement tool (ex. Vernier calipers). Select the appropriate size from the chart below. 


Please Note: Should your selection fall at the upper range of one fit and the lower range of the next size up, choose the fit that falls closer to the upper range as opposed to the next size range up.