Optical Imaging of Compact Photographic Zoom Lens Systems

Abstract

Optical imaging technologies rely on zooming to enhance visual clarity and achieve high resolution. The zooming capability of imaging systems is influenced by several elements, including the focal length of each group, the zoom ratio, the range of focal lengths, the front focal length, the back focal length, the image distance, and the object length. This paper discusses a photographic zoom lens with group of three element and a focal length range of 35 mm to 69 mm. The entrance pupil diameter (EPD) is 8.5885 mm, the visible wavelength is 656, 486, 587nm, the field of angle is 0, 14, 19, the F-number range is from 4.1633 ,5.8407 and 8.02 for three zooming level, and the semi field of view (FOV) is 28,20,15 degrees. The performance of this suggested system design is evaluated by measuring and observing the picture quality utilizing advanced techniques such as modulation transfer function (MTF), ray aberration curve, point spread function, and spot diagram (SPO). The modulation transfer function (MTF) is 0.9 for a spatial frequency of 20-line pairs per millimeter (lp/mm), and 0.8 for a spatial frequency of 50 lp/mm. The spot diagram indicates that the rays converge along the optical axis at zoom point 1, in contrast to zoom positions 2 and 3.