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2. Abbe number - Wikipedia

   en.wikipedia.org/wiki/Abbe_number

   Abbe number. In optics and lens design, the Abbe number, also known as the V-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of V indicating low dispersion. It is named after Ernst Abbe (1840–1905), the German physicist ...

3. Condenser (optics) - Wikipedia

   en.wikipedia.org/wiki/Condenser_(optics)

   Abbe condensers are difficult to use for magnifications of above 400X, as the aplanatic cone is only representative of a numerical aperture (NA) of 0.6. This condenser is composed of two lenses, a plano-convex lens somewhat larger than a hemisphere and a large bi-convex lens serving as a collecting lens to the first.

4. 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. In February 2017 Canon announced the new Canon ...

5. List of Canon products - Wikipedia

   en.wikipedia.org/wiki/List_of_Canon_products

   In 1987, Canon introduced the EOS Single-lens reflex camera system along with the EF lens-mount standard to replace the 16-year-old FD lens-mount standard; EOS became the sole SLR camera-system used by Canon today. Canon also used EOS for its digital SLR cameras.

6. Canon FTb - Wikipedia

   en.wikipedia.org/wiki/Canon_FTb

   The Canon FTb is a 35 mm single-lens reflex camera manufactured by Canon of Japan from March 1971 replacing the Canon FT QL. It features a Canon FD lens mount, and is also compatible with Canon's earlier FL-mount lenses in stop-down metering mode. Launched alongside the top-of-the-line F-1, the FTb was the mass-market camera in the range.

7. Canon EOS 1000D - Wikipedia

   en.wikipedia.org/wiki/Canon_EOS_1000D

   Canon EOS 1100D. Canon EOS 1000D is a 10.1-megapixel digital single-lens reflex camera announced by Canon on 10 June 2008 and started shipping in mid August 2008. It is known as the EOS Kiss F in Japan and the EOS Rebel XS in the United States and Canada. The 1000D is an entry-level DSLR that has been described as being a step below the 450D.