Tamron-F 2x PZ-AF BBAR MC7 teleconverter for Pentax K lens mount_C Mount it's suitable for most day-to-day

it's suitable for most day-to-day lighting situations

there are 51 AF points and framerates up to 9fps in FX mode

from the earliest manual focus models to the newest digital ones- so if you're looking for an "all purpose" lens and you've got a Pentax camera

and image quality is excellent

Tamron-F 2x PZ-AF BBAR MC7 teleconverter for Pentax K lens mount_C Mount it's suitable for most day-to-dayTamron F 2x PZ AF BBAR MC7 teleconverter for Pentax K mount cameras and lenses. This is an "autofocus" teleconverter with passthroughs for electronic contacts and mechanical focus coupling. So it will autofocus in theory, but autofocus performance will vary with lens, camera, and shooting conditions so don't bet the farm on it.