Owen A. Davies Posted May 8, 2023 Share Posted May 8, 2023 Does anyone know if the T stops were ever measured for the Krasnogorsk's primary lens, the Zenit Meteor 17-69mm. For the sake of metering, I'd love to know how much actual light the lens lets through. I haven't seen any info on this posted anywhere. Thanks. Link to comment Share on other sites More sharing options...
Premium Member Dom Jaeger Posted May 9, 2023 Premium Member Share Posted May 9, 2023 Most zooms like this lose around a third to half a stop. Damaged coatings or internal fog will add more loss. I'd probably rate that zoom at about T2.2. As a general rule, primes lose less than a quarter of a stop, modern zooms a sixth to a third, and older zooms between a third and two thirds of a stop. The number of elements play a part, so larger zooms will lose more. Link to comment Share on other sites More sharing options...
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