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2. Sigma 19mm F2.8 EX DN - Wikipedia

   en.wikipedia.org/wiki/Sigma_19mm_F2.8_EX_DN

   The Sigma 19mm F2.8 EX DN lens is a wide-angle prime lens for Sony E and Micro Four-Thirds mounts, announced by Sigma in January 2012. Along with the Sigma 30mm F2.8 EX DN, it was part of the first release of Sigma lenses for compact interchangeable lens cameras, and hence the inception of the "DN" line, created by Sigma to cater to these cameras, [1] an offering that in January 2013 was ...

3. 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.

4. Lensbaby - Wikipedia

   en.wikipedia.org/wiki/Lensbaby

   Lensbaby is a line of camera lenses for DSLR and mirrorless cameras that combines a simple lens with a bellows/ball and socket mechanism for use in special effect photography. A Lensbaby can give effects normally associated with view cameras. The lenses are for use in selective focus photography and bokeh effects. [2] [3]

5. List of third-party Sony E-mount lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_third-party_Sony_E...

   8mm T3.1 Cine UMC FISH-EYE II Cine Lens [351] 8mm T3.8 VDSLR UMC Fish-eye CS II Cine Lens [352] 10mm T3.1 VDSLR ED AS NCS CS II Cine Lens [353] 12mm T2.2 Cine NCS CS Cine Lens [354] 16mm T2.2 VDSLR ED AS UMC CS II Cine Lens [355] 21mm T1.5 ED AS UMC CS Cine Lens [356] 35mm T1.3 AS UMC CS Cine Lens [357] 50mm T1.3 AS UMC CS Cine Lens [358] Photo ...

6. Canon EOS M - Wikipedia

   en.wikipedia.org/wiki/Canon_EOS_M

   Canon EOS M is the first mirrorless interchangeable-lens camera produced by Canon. DPReview noted that the EOS M is effectively a miniature version of the Canon EOS 650D, which was introduced in June 2012, with a simpler physical interface. [1] The letter M in EOS M stands for "mobility" and EOS means "electro-optical system".

7. Acutance - Wikipedia

   en.wikipedia.org/wiki/Acutance

   The term critical sharpness is sometimes heard (by analogy with critical focus) for "obtaining maximal optical resolution", as limited by the sensor/film and lens, and in practice means minimizing camera shake – using a tripod or alternative support, mirror lock-up, a cable release or timer, image stabilizing lenses – and optimal aperture ...