Abstract: A configuration for an unstable, negative branch imaging resonator (NBIR) is disclosed in which coupling mirrors are added so that the Primary and Secondary mirrors are not in direct optical communication with the imaging systems which minimizes the occurrence of the NBIR experiencing magnification runaway and/or odd order aberrations by using coupling mirrors to provide indirect optical communication between the imaging systems and the Primary and Secondary end mirrors.

Abstract: A configuration for an unstable, negative branch imaging resonator (NBIR) is disclosed in which coupling mirrors are added so that the Primary and Secondary mirrors are not in direct optical communication with the imaging systems which minimizes the occurrence of the NBIR experiencing magnification runaway and/or odd order aberrations by using coupling mirrors to provide indirect optical communication between the imaging systems and the Primary and Secondary end mirrors.

Abstract: A pliant projectile is provided with a plurality of 1-shaped grooves in the circumference thereof. The grooves are at an angle with the axis of the projectile and, in flight, will, through interaction with the air, cause the projectile to rotate about its axis, thereby stabilizing the flight path. The projectile may be provided with an additional stabilizing member extending from its tail which member includes a plurality of tabs each having a fin that can interact with the air, in flight, to add additional rotational forces to the projectile.