Pentax is a world-famous brand of optical products, and its brand culture can be traced back to the Asahi Optics Joint Venture established in 1919. In 1979, the Pentax Auto110 camera was selected by NASA to be installed in a constellation observation rocket, in 1981, Pentax launched the world's first lens-lens autofocus single-lens reflex camera ME-F, and in 2008, it developed the world's smallest built-in APS-C sensor DSLR - "K-m" and so on. In 2011, Pentax Imaging was transferred to Ricoh Imaging Co., Ltd. and became a camera sub-brand of Ricoh.
 
Compared with the top-ranked medium-format SLR, which costs two or three hundred thousand yuan, the biggest advantage of Pentax medium-format SLR is that it is affordable, and the fuselage is only about 60,000 yuan. Pentax's latest medium format SLR is the 645Z, released in 2014 and is the first medium format SLR to use a CMOS sensor. Compared with the mainstream 135-format single-sided image, the 645Z has a relatively close performance in terms of control, focusing and metering system, and high ISO performance, and its medium format sensor with about 51.4 million effective pixels can achieve better image quality performance. Compared with the Hasselblad and Phase One medium-format SLRs, the Pentax 645Z has a non-replaceable back design, and photographers can only use the medium-format sensor with about 51.4 million effective pixels that come standard on the body. Pentax has exquisite workmanship as a whole and has the characteristics of three defenses. The image quality is excellent at both high and low sensitivity, with strong optical image stabilization characteristics, a high success rate of handheld shooting, and support for high-definition video shooting. It has a downside of the large body weight and a flash sync speed of only 1/125 of a second.