In April, Ricoh introduced its Pentax K-3 II DSLR camera, and now a couple months later it is issuing a service advisory: some owners may experience issues with the camera failing to shut off even when toggled to “OFF”. That presents some obvious issues, but appears to be fairly limited in scope. The camera company has detailed which owners may be affected, and will proceed with repairs if necessary. In addition, Nikon has issued an advisory regarding a shutter problem with some of its D750 cameras.
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https://www.slashgear.com/pentax-k-3-ii-and-nikon-d750-service-advisories-issued-10392563/