The Sigma 17-40mm F1.8 DC Art zoom lens brings full-frame background blur to APS-C cameras to satisfy shutterbugs who chase ...

A phase-locked loop (PLL) using a single-ring-oscillator-based integrator with background frequency calibration is presented. By introducing the single-ring-oscillator-based integrator, the in-band ...

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The Sigma 56mm F1.4 is the longest telephoto option of a quartet of Contemporary DC DN F1.4 primes, with an effective 85mm focal length. For me, it's the best buy of the bunch, able to create dreamy ...

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