I will be eagerly heading to California next week and my bags are packed with my full Contax RF outfit and the trusty Rollei 2.8F... I will be visiting death valley and taking early morning pictures. Are these the last the Sonnars will produce before separating in the heat? I will be air conditioning them in my car with me...Should I leave the Contax at home and just go with my Nikon SLR? I love to use these cameras but would hate to see them die from exposure to the sun (heat). What would you do?