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DETAIL: Celestron Collimation Eyepiece - 1-1/4'' - 94182 USE: Ideal for precise collimation of Newtonians COMPATIBILITY: Special eyepiece fits into 1¼" focusers or diagonals EASY ALIGNMENT: Alignment is easy using the small opening on one end and thin cross hairs at the other end MORE ACCURATE: Collimation eyepiece is more accurate than the simple Collimation Tool