Vivitar Automatic Tele Converter 3x-8 for M42 brand_Kawauso-Shoten you may have difficulty mounting

you may have difficulty mounting it to this bellows: the rear mount doesn't swivel and the rear standard support may get in the way

not the "BC" version with a corner-darkening mask

The Sony FE 35mm f2

but the long rear flange will interfere with full-frame SLR mirrors- so keep it away from your 5D

bag looks unused

Vivitar Automatic Tele Converter 3x-8 for M42 brand_Kawauso-Shoten you may have difficulty mountingMost 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.