Keywords: Ptp p88 img02.png en Second illustration on page 69 88 captioned Fixed-focus Telephoto F/4 8 Lee 2011-04-14 http //www archive org/details/PhotographyTheoryAndPractice 1937 PD-old PD-US Uploaded with UploadWizard Photography Theory and Practice Lens diagrams Cutaway diagrams of photographic lenses |