The 555ELD has several noticeable improvements over the 553. It is designed for better integration with digital backs and also has an infra-red remote capability which means cumbersome remote cords are no longer needed. Regrettably the 555 has been discontinued....The 503CW with winder has become the camera of choice for many who require the motorized transport.

For additional information we suggest you visit the Hasselblad website.