What types of Pentax aperture doors are available?

The models of Pentax aperture doors are K-30, K-50 and K-70. The symptom is that the aperture will be minimized during exposure, resulting in a serious underexposure and a completely black image. It is necessary to replace the aperture servo element to completely solve it.

Pentax is a world-famous optical brand, and its products cover astronomical telescopes, medical endoscopes and glasses. Pentax's brand culture can be traced back to Asahi Optical Joint Venture established in Tokyo, Japan in 19 19.

Asahi Optical Co., Ltd. is a famous optical manufacturer in Japan, which has created a number of world firsts and Japanese firsts in photography. As a brand of SLR cameras under Xu Optics, Pentax once dominated, and once existed as a world-famous Pentax Company (in 2002, Xu Optics was officially renamed Pentax Company).

In 2007, all the business of Pentax was absorbed and merged by HOYA Co., Ltd., another major Japanese optical company, and Pentax no longer existed as an independent company. 20 1 1 Ricoh group, a famous Japanese office equipment manufacturer, announced the acquisition of the photography department of HOYA co., ltd.

Pentax brand has been split into two parts, except medical optics, which still belongs to HOYA Co., Ltd., and its main imaging business is owned by Ricoh Imaging Co., Ltd., a wholly-owned subsidiary of Ricoh Group, which was established on 2011(renamed on 2013).