Keywords: Ptp p90 img01.png en First illustration on page 71 90 captioned Parts of Lens Mount 2011-04-14 http //www archive org/details/PhotographyTheoryAndPractice L P Clerc PD-old PD-US Uploaded with UploadWizard Photography Theory and Practice Lenses Cutaway diagrams of photographic lenses Lens mounts |