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The D7200 works physically in the D7100 housing, but the TTL protocol has changed and requires an update of the electronics. We are hoping that an updated version of the housing will be able to be offered which accommodates both cameras. If this is the case, we will also offer updates to existing housings for the D7100 at a nominal fee.
Information will be posted on the Ikelite site next week as soon as it becomes available. You can also sign up for an email alert on this model by clicking here.
Regards,
Jean