The Pentax K-mount, sometimes referred to as the "PK-mount", is a bayonet lens mount standard for mounting interchangeable photographic lenses to 35 mm single-lens reflex (SLR) cameras. It was created by Pentax in 1975, and has since been used by all Pentax 35 mm and digital SLRs and also the MILC Pentax K-01. A number of other manufacturers have also produced many K-mount lenses and K-mount cameras.
Originally produced as Konica Minolta AF Zoom DT 18-200mm f/3.5-6.3 (D) by Konica Minolta in 2005, and currently produced by Sony, the Sony α DT 18-200mm f/3.5-6.3 (SAL-18200) is compatible with cameras using the Minolta A-mount and Sony A-mount lens mounts. The DT designation means this lens is designed to be used with a camera with an APS-C size sensor. When the 1.5× crop factor is considered, the lens has an effective equivalent 27–300mm focal length. The lens is derived from the Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Aspherical [IF] (models A14M/A14S).
The Canon EF-S 18–200mm lens is a superzoom lens, manufactured by Canon. It is the higher end kit lens for the Canon EOS 60D digital camera, and supplants the previous EF-S 17–85mm, in Canon's product line-up, losing 1mm off the wide end, and offering a roughly 2.5x longer telephoto end.
The EF28-200mm f/3.5-5.6 USM lens was a superzoom lens made by Canon Inc.
The Tamron 16-300mm F/3.5-6.3 Di II VC PZD MACRO is a superzoom lens designed for digital crop sensor cameras.
Zoom creep is a phenomenon in zoom lenses where the angle of view of the lens changes when gravity is allowed to freely act on it. If the lens has a zoom ring, holding it when the lens is held upwards or downwards will prevent this change. In lenses with push-pull zoom, creep is prevented by holding the extending part of the lens. Some lenses, such as the Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical [IF] and Canon EF-S 18-135mm f/3.5-5.6 IS STM, have a zoom lock to stop the effect.
The Pentax K-3 II is a flagship APS-C DSLR camera announced by Ricoh on April 22, 2015.
The Tamron 18-270mm F/3.5-6.3 Di II VC PZD is a superzoom lens for APS-C DSLR cameras, announced by Tamron on December 9, 2010. The Sony/Minolta A mount version is simply called Tamron 18-270mm F/3.5-6.3 Di II PZD as it lacks image stabilisation.
The Tamron SP 150-600mm F/5-6.3 Di VC USD is a super telezoom lens for DSLR cameras, announced by Tamron on November 7, 2013. The Sony A mount version is called Tamron SP 150-600mm F/5-6.3 Di USD as it lacks image stabilisation.
The Tamron 14-150mm f/3.5-5.8 Di III is an interchangeable camera lens for the Micro Four Thirds camera system, announced by Tamron on June 19, 2014.
The Tamron AF 18-200mm F/3.5-6.3 XR Di II LD Aspherical [IF] Macro is a superzoom lens by Tamron, initially announced in 2005. A year later, Tamron announced the Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical [IF] Macro with a slightly larger zoom range. However, in 2008, the 18-200 model was re-released with a built-in motor for Nikon bodies lacking a motor in the body - at that time the Nikon D40, D40x and D60.
The Tamron SP 15-30mm F/2.8 Di VC USD is an interchangeable wide-angle zoom lens announced by Tamron on September 12, 2014.
The Tamron 28-300mm F/3.5-6.3 Di VC PZD is an interchangeable superzoom camera lens announced by Tamron on February 6, 2014.
The Tamron SP 70-200mm F/2.8 Di VC USD is an interchangeable telezoom lens with constant, large aperture. It is available in Nikon, Canon and Sony mounts and was announced by Tamron on September 13, 2012.
The Tamron AF 18-270mm F/3.5-6.3 Di II VC LD Aspherical (IF) MACRO is an interchangeable superzoom camera lens for Canon EF-S and Nikon F APS-C bodies, announced by Tamron on July 30, 2008. Less than two years later, it was succeeded by the more compact Tamron 18-270mm F/3.5-6.3 Di II VC PZD.
The Tamron SP AF 60mm F/2 Di II LD IF Macro is an interchangeable macro lens designed for Canon, Nikon and Sony crop bodies and announced by Tamron on March 24, 2009. Among its peers, it stands out by its large aperture of f/2.
The Tamron 18-200mm F/3.5-6.3 Di III VC is an APS-C superzoom lens announced by Tamron on December 8, 2011. It can be mounted on Canon EOS-M and Sony E-mount (NEX) camera bodies.
The Tamron SP 45mm f/1.8 Di VC USD is an interchangeable standard prime lens for cameras with a full-frame or smaller sensor. On an APS-C camera, its field of view is narrower, so as to be more useful as a short portrait lens. It was announced by Tamron on September 2, 2015.
