Vivitar Automatic Tele Converter 3x-8 for M42 hoya does not include retaining ring

does not include retaining ring

It's not electronic

Approximately 17k actuations

deal with it

It supports up to 25kg and locks tight with an easy to grab lever- no fiddly knobs here

Vivitar Automatic Tele Converter 3x-8 for M42 hoya does not include retaining ringMost teleconverters only double your focal length; this one triples it. 3x is 50% better than 2x! Everyone will be impressed with your new teleconverter and you will become famous as the person with the most teleconverted lens. We cant guarantee that any of that is true, but what if it was? Wouldnt that be something? This teleconverter works on M42 lenses and bodies.