A Signature lens with an attached Impression V Filter cannot be mounted to an ALEXA Mini or AMIRA because the filter protrudes into the lens port too deeply, and might lead to a mechanical collision between the camera and the filter. This could potentially cause damage to the Impression V Filter. Furthermore, a proper closing of the LPL mount cannot be ensured anymore.
However, ALEXA Mini and AMIRA cameras that have been converted for use with a Leica M mount are an exception. In this...