A speedlite flash for your Pentax camera must be compatible with Pentax P-TTL metering for automatic exposure control. To get this you don’t have to buy a speedlite from Pentax. Alternatives include flashes from Yongnuo, Godox, Pixel, Shanny or Meike etc. Apart from the TTL enabled speedlite flashes there are also manual flashes (without TTL metering) which are less expensive but lack some features.
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Yongnuo YN860Li is a lithium-ion battery powered speedlite, the latest edition in the Yongnuo’s series of Remote Manual speedlites with 2.4GHz radio transceivers built inside. Recycle time is approximately 1.5 seconds at full power, which is an excellent improvement over the 2.5 – 3 seconds of AA powered speedlites.
Yongnuo YN720 is a lithium-ion powered speedlite, the latest edition in the Yongnuo’s series of Remote Manual speedlites with 2.4GHz radio transceivers built inside. Recycle time is approximately 1.5 seconds at full power, which is an excellent improvement over the 2.5 – 3 seconds of AA powered speedlites.
Yongnuo YN585EX Speedlite for Pentax Cameras offers full P-TTL support, including rear curtain sync and red eye reduction. YN585EX offers a powerful guide number of 58m at ISO 100 and 105mm as well as a zoom head with coverage for lenses of 20-105mm. Also, it has a wide-angle diffusion panel that expands the beam to work with 14mm lenses. Along with these capabilities, the YN585EX can tilt from -7 to 90° and can rotate both left and right 180°.
Godox TT350P is an excellent compact size flash unit for Pentax cameras that provides TTL, HSS and full 2.4GHz Godox X System radio Master and Slave modes built inside. It is a perfect on-camera flash for any camera system and especially mirrorless systems
Godox V1 flash for Pentax is very much anticipated Lithium-ion powered Round Head TTL Speedlight. We must say that it is probably the best flash speedlight on the market. This is a significant jump from the previous 3rd party flashes in terms of beam pattern, modifier coverage, usability, and TTL reliability
Yongnuo YN560 IV is the successor of the very popular YN-560 III and the best Yongnuo manual speedlite in the YN560 series. Compared to YN-560 III, YN560 IV can now act as a master unit to other YN560 III/IV flashes and control up to 3 groups of flashes in Radio Master Mode. It maintains compatible with current range of manual triggers YN560-TX, RF-605, RF-603 II, RF-603 and RF-602.