Higher order astigmatism and field curvature in mobile phone lens designs скачать в хорошем качестве

Higher order astigmatism and field curvature in mobile phone lens designs

In the design of mobile phone lenses, the so-called "field curvature" plots (field curves) display tangential (T) and sagittal (S) curves with many "wiggles" (twists and turns), which are often an attempt by the designer to "correct" field curvature. But in an earlier video (   • Do aspheres correct field curvature in a l...  ), I showed that, actually, aspheres do not strictly correct the field curvature. Rather, the T and S curves are controlled by aspheres to balance the field curvature. In the current video, I explain how this balancing is done, which is by the use of higher-order astigmatism terms in the field curves. I also point to a subsection in chapter 1 in my book, "Modern Classical Optical System Design". Here is the link to the book: https://doi.org/10.1088/978-0-7503-60.... Chapter 1 is FREE to read. The subsection I point to is at Sec. 1.4.3, titled, "Why are mobile phone lenses not used as high-aperture laser scan lenses?" You can purchase the book either on Amazon or at the IOP eBooks website. Equations (1) and (2) in the first few minutes of the video can be derived from a Taylor series, but here, they are taken from R. R. Shannon, The Art and Science of Optical Design, (Cambridge, 1997), pp 256-257. At around 8:30 min, aspherizing the second singlet (the meniscus one) helps with the spherical and coma aberration (I forgot to mention the coma in the video). At around 10:43 min, a ladybug flew onto my mouse and I tried to move it, LOL! The singlet design examples were monochromatic at 550 nm, while the mobile phone lens designs were polychromatic at the F, d, C wavelengths, weights = 1 each. This is not a video about how to design optical systems using Zemax OpticStudio®. To learn more about designing using OpticStudio, visit Mark's excellent site, "Design Optics Fast":    / @designopticsfast   Other channels to learn optical design using OpticStudio­®: Zemax LLC channel:    / @zemaxllc   OpticsRealm by Scott Sparrold:    / @opticsrealm