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2. Varifocal lens - Wikipedia

   en.wikipedia.org/wiki/Varifocal_lens

   A varifocal lens is a camera lens with variable focal length in which focus changes as focal length ... Middle image is at 12 mm with the focus left alone from 2.8 mm ...

3. Fixed-focus lens - Wikipedia

   en.wikipedia.org/wiki/Fixed-focus_lens

   Fixed focus can be a less expensive alternative to autofocus, which requires electronics, moving parts, and power.Since fixed-focus lenses require no input from the operator, they are suitable for use in cameras designed to be inexpensive, or to operate without electrical power as in disposable cameras, or in low-end 35 mm film point and shoot cameras, or in cameras featuring simple operation.

4. Olympus XA - Wikipedia

   en.wikipedia.org/wiki/Olympus_XA

   The original XA was a rangefinder camera with a fast 35 mm f/2.8 lens, and aperture priority metering. It was one of the smallest rangefinder cameras ever made, together with the Contax T . Later models—XA2, XA3 and XA4—featured scale focusing instead of rangefinders.

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. Zoom lens - Wikipedia

   en.wikipedia.org/wiki/Zoom_lens

   For example, a zoom lens with focal lengths ranging from 100 mm to 400 mm may be described as a 4:1 or "4×" zoom. The term superzoom or hyperzoom is used to describe photographic zoom lenses with very large focal length factors, typically more than 5× and ranging up to 19× in SLR camera lenses and 22× in amateur digital cameras.

7. Ricoh GR (large sensor compact camera) - Wikipedia

   en.wikipedia.org/wiki/Ricoh_GR_(large_sensor...

   802.11/Wi-Fi – to remotely control the camera as well as providing the option to transfer images from the camera to a mobile device or computer [2] NFC [2] Maximum shutter speed when shooting at f/2.8 increased by 1/3 EV to 1/2500 s [2] Can shoot 10 raw frames at its maximum shooting rate of 4 fps (up from 4 raw frames) [2]