Pentax does not currently sell any TCs. However, the lens road map they published last year listed a 1.4 TC. It might be worth waiting to see if Pentax releases it.
I have been looking forward to it to pair with a 300 f/4 lens. But I don't have any information about which lens the new TC will support.
|Hot Air Balloons Over Bagan by User9320321874|
|Yellow Warbler by LeeS|
from A Big Year - birds
|Waiting for the Parade by tcoker1103|
from - La Vida Loca - (Black and White Street Photography+ A Border)