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2. 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]

3. Henry's (electronics retailer) - Wikipedia

   en.wikipedia.org/wiki/Henry's_(electronics_retailer)

   A close up of Harry Stein (founder of Henry & Company, later Henry's) in front of his first store in Toronto, Ontario. Henry's was established in 1909 by Harry Himelstein, a Russian laborer on the Trans-Siberian Railway - turned watchmaker - who immigrated to Canada in 1906 at the age of 16.

4. Photo print sizes - Wikipedia

   en.wikipedia.org/wiki/Photo_print_sizes

   The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...

5. 35 mm equivalent focal length - Wikipedia

   en.wikipedia.org/wiki/35_mm_equivalent_focal_length

   35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...

6. Zenni Optical - Wikipedia

   en.wikipedia.org/wiki/Zenni_Optical

   Zenni Optical mail order. Zenni Optical was founded in 2003 by Tibor Laczay and Julia Zhen. [1] [2] Before being renamed to Zenni Optical when it began offering $7 and $8 glasses, the company was named 19dollareyeglasses.com. [3] [4] [5] Around 2014, co-founder Zhen acquired the building occupied by the Marin Independent Journal to house Zenni. [6]

7. List of Micro Four Thirds lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_Micro_Four_Thirds...

   The Micro Four Thirds system (MFT) of still and video cameras and lenses was released by Olympus and Panasonic in 2008; lenses built for MFT use a flange focal distance of 19.25 mm, covering an image sensor with dimensions 17.3 × 13.0 mm (21.6 mm diagonal). MFT lenses have been produced by many companies under several different brands ...

8. Lenses for SLR and DSLR cameras - Wikipedia

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

   For example, a 100 mm to 400 mm lens may have a maximum aperture of f/4.0 at the 100 mm end but will diminish to only f/5.6 at the 400 mm end of the zoom range. Zoom lenses with constant maximum apertures (such as f/2.8 for a 24–70mm lens) are usually reserved for lenses with higher build quality and are thus more expensive than those with ...

9. Micro Four Thirds system - Wikipedia

   en.wikipedia.org/wiki/Micro_Four_Thirds_system

   Drawing showing the relative sizes of sensors used in most current digital cameras, relative to a 35mm film frame. The image sensor of Four Thirds and MFT measures 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm (21.63 mm diagonal), comparable to the frame size of 110 film. [4]