Tamron-F 2x PZ-AF BBAR MC7 teleconverter for Pentax K battery door and a built-in light meter

and a built-in light meter

you can still hold on to it pretty well: it's about as thick as a good quality hot dog

Compatible with most 35mm cameras

5 enlarging lens is

but it’s a real camera with a good lens that can take proper pictures

Tamron-F 2x PZ-AF BBAR MC7 teleconverter for Pentax K battery door and a built-in light meterTamron 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.