Soligor Auto Tele Converter 2x for M42 brand_Cokin if you can control the

if you can control the lens aperture through your camera body and it has in-body autofocus motor

but it's 11mm

compact autofocus telephoto zoom lens for Pentax K mount mount SLR cameras- film or digital

with some paint and surface wear on the barrel

The Wirgin Edixa Reflex is a classic 35mm SLR camera from the European old school- so things work a bit differently than you might expect

Soligor Auto Tele Converter 2x for M42 brand_Cokin if you can control theThe Soligor Auto Tele Converter 2x is a little teleconverter for M42 thread mount lenses and cameras. Nothing fancy, just doubles your focal length at the cost of a few meagre stops of light.