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We report on a diagnostic method for observing the implosion asymmetry of soft‐x‐ray‐driven fusion capsules. The method consists of an x‐ray backlight source using a 4.8‐keV quasi‐monochromatic titanium x‐ray source and a fast multiframe x‐ray imaging system. With the proper combination of spectral filters and photocathode to reduce intense background x rays from a gold cavity plasma, x‐ray backlighting images of the fusion capsules have been successively obtained with spatial and temporal resolutions of 20 μm and 80 ps, respectively. These images are used to study the implosion velocity and the lower‐mode distortion caused by x‐ray irradiation nonuniformity on the imploding fusion capsule.