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We com­bine rig­or­ous lab tests with real-world shoot­ing for the most ac­cu­rate re­sults pos­si­ble

Our lens tests are based on a two-stage pro­ce­dure. First, lab tests are car­ried out shoot­ing two test charts un­der con­trolled light­ing con­di­tions. The re­sults are pro­cessed us­ing Imat­est Master, so that we can quan­tify op­ti­cal per­for­mance in terms of sharp­ness, dis­tor­tion and chro­matic aber­ra­tions. Over­all qual­ity is as­sessed at the cen­tre, edge and corners of the im­ages. Some of the lenses in this group, how­ever, in­ten­tion­ally blur im­ages to­wards the edges of im­ages, so low scores aren’t nec­es­sar­ily a bad thing.

For real-world test­ing, we use each of the lenses un­der vary­ing in­door and out­door light­ing con­di­tions. Over­all han­dling is checked, along with smooth­ness and pre­ci­sion of con­trols. In some cases, the min­i­mum fo­cus dis­tance and the aper­ture of lenses are not even spec­i­fied by the man­u­fac­turer, so we mea­sured these in the lab.

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