In designing this lens we successfully controlled the color aberration and distortion of picture image at the least, and could reach to the highest resolution power of 350-line/mm at center. MTF 30%. Equivalent to 1890-line/TV(1/4-Inch CCD), 2520-line/TV(1/3-Inch CCD).The picture becomes soft focus beyond 6X zoom telephoto position while wideangle lens is on the camera.