**USED** TAMRON MC TELE CONVERTER 2X PENTAX SCREW M42

The Tamron MC 2x Teleconverter for M42 screw mount is a manual-focus optical accessory that doubles the focal length of a lens while reducing its light intake by two f-stops. Designed with a standard 42mm thread, it screws directly into vintage SLR cameras.

• Focal Length: Increases the focal length of your attached lens by 2x (e.g., a 50mm lens becomes a 100mm lens).
• Aperture Reduction: Reduces light by 2 f-stops (e.g., an \(f/1.8\) lens becomes \(f/3.5\)).