In early Daguerreotype studios, the sitter had to sit in a "posing chair." What was the purpose of that uncomfortable contraption? It made the sitter tall enough for the camera.

It placed the sitter in the middle of the lens.

It allowed many people to be photographed at once.

It kept the sitter from moving.

answer; i believe that the correct answer is (digital zoom);

i believe the answer is  the similarity is that both are sacrifices which have the same purpose and sacrifice - jesus christ, but the difference is in offering of that sacrifice.

the similarity is that both are sacrifices which have the same purpose (repenting our sins) and sacrifice - jesus christ.  the difference is in the way of the offering that sacrifice. the sacrifice of jesus on the calvary is sacrifice of his actual living body and blood, but the sacrifice of the mass is the sacrifice of the jesus through bread (body) and blood (wine). in the sacrifice on calvary jesus was offered for us; while at mass he offers himself through us.