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2. Optical manufacturing and testing - Wikipedia

   en.wikipedia.org/wiki/Optical_manufacturing_and...

   Optical manufacturing and testing is the process of manufacturing and testing optical components. It spans a wide range of manufacturing procedures and optical test configurations. The manufacture of a conventional spherical lens typically begins with the generation of the optic's rough shape by grinding a glass blank. [1]

3. Canon EF 70-300mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_70-300mm_lens

   Introduced on 15 September 2016, Canon EF 70-300mm f / 4-5.6 IS II USM lens is the second Canon lens equipped with Nano USM technology, a focusing motor that combines the benefits of a ring USM (ultrasonic motor) for high-speed AF during still photo shooting and lead-screw type STM (stepping motor) for smooth and quiet video autofocusing (AF). [6]

4. List of standard zoom lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_standard_zoom_lenses

   There is no precise definition of the term, but lenses marketed as "standard zoom" usually cover a range of at least 30mm to 70mm in terms of 35mm equivalent focal length with an optical zoom ratio of 2.5× (e.g. 28-70mm) to 5× (e.g. 24-120mm) — the most common being 3× (e.g. 24-70mm). [1]

5. The best Canon telephoto lenses in 2022: for your DSLR or EOS ...

   www.aol.com/news/best-canon-telephoto-lenses...

   The best Canon telephoto lenses for EF and RF mounts enable you to get up close to the action even from far away ... Autofocus type: Nano USM | Stabilizer: 5.5-stop Optical | Minimum focus ...

6. Nikon - Wikipedia

   en.wikipedia.org/wiki/Nikon

   Canon introduced a new type of lens-camera interface with its entirely electronic Canon EOS cameras and Canon EF lens mount in 1987. The much faster lens performance permitted by Canon's electronic focusing and aperture control prompted many professional photographers (especially in sports and news) to switch to the Canon system through the ...

7. Canon Extender EF - Wikipedia

   en.wikipedia.org/wiki/Canon_Extender_EF

   The Canon Extender EF lenses are a group of teleconverter lenses made by Canon. These lenses are used between any compatible EF type lens and any of the Canon EOS line of cameras. When used with a compatible lens, they will multiply the focal length of the lens by a factor of either 1.4x or 2x, at the cost of decreasing the lens' aperture by 1 ...