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2. Lenses for SLR and DSLR cameras - Wikipedia

   en.wikipedia.org/wiki/Lenses_for_SLR_and_DSLR...

   [6] A wide-angle lens has a shorter focal length and includes more of the viewed scene than a normal lens; a telephoto lens has a longer focal length and captures a small portion of the scene, making it seem closer. Lenses are not labeled or sold according to their angle of view, but rather by their focal length, usually expressed in millimeters.

3. Nikon AF-S DX VR Zoom-Nikkor 18-200mm f/3.5-5.6G IF-ED ...

   en.wikipedia.org/wiki/Nikon_AF-S_DX_VR_Zoom...

   The Nikon AF-S DX VR Zoom-Nikkor 18-200mm f / 3.5-5.6G IF-ED is an image stabilised superzoom lens manufactured by Nikon for use on Nikon DX format digital SLR cameras. It provides a single-lens "walk-around" solution for wide-angle through to telephoto shots, as well as close-up photography.

4. Wide-angle lens - Wikipedia

   en.wikipedia.org/wiki/Wide-angle_lens

   For example, a 28 mm lens on the DSLR (given a crop factor of 1.5) would produce the angle of view of a 42 mm lens on a full-frame camera. So, to determine the focal length of a lens for a digital camera that will give the equivalent angle of view as one on a full-frame camera, the full-frame lens focal length must be divided by the crop factor.

5. Canon EF-S 18–55mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF-S_18–55mm_lens

   The Canon EF-S 18–55mm lens f / 3.5–5.6 is a Canon-produced wide-angle to mid telephoto zoom lens for digital single-lens reflex cameras with an EF-S lens mount. The field of view has a 35 mm equivalent focal length of 28.8–88mm, and it is a standard kit lens on Canon's consumer APS-C DSLRs.

6. Angle of view (photography) - Wikipedia

   en.wikipedia.org/wiki/Angle_of_view_(photography)

   So a standard 50 mm lens for 35 mm photography acts like a 50 mm standard "film" lens even on a professional digital SLR, but would act closer to a 75 mm (1.5×50 mm Nikon) or 80 mm lens (1.6×50mm Canon) on many mid-market DSLRs, and the 40-degree angle of view of a standard 50 mm lens on a film camera is equivalent to a 28–35 mm lens on ...

7. Canon EF-S 10–22mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF-S_10–22mm_lens

   The Canon EF-S 10–22mm f / 3.5–4.5 USM lens is a wide to ultra-wide angle zoom lens for Canon digital single-lens reflex cameras with a Canon EF-S lens mount. [1] The field of view has a 35 mm equivalent focal length of 16–35mm, which is analogous to the EF 16–35mm f / 2.8L on a full-frame camera. The 10–22mm is an internal focusing lens.