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EF 400mm f/5.6L USM image quality

Started Jul 1, 2021 | Questions thread
John Crowe
John Crowe Veteran Member • Posts: 3,476
Re: EF 400mm f/5.6L USM image quality

Thank goodness.  Return it.  Could be the motor or intermittent connection to the camera.  Either because of the pins or one of the internal electrical ribbons or one of the sockets.  Does sound like electronic circuit problem as opposed to the motor.

 John Crowe's gear list:John Crowe's gear list
Canon EOS 5DS R Canon EF 70-200mm F4L USM Canon TS-E 17mm f/4L Kenko Teleplus Pro 300 AF 1.4x Venus Laowa 12mm F2.8 Zero-D +15 more
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