Sigma APO Teleconverter 1.4X EX DG for Nikon F pentax adapter This G9 includes a Panasonic

This G9 includes a Panasonic battery and the compact original charger which connects via the included Micro-USB cable to a USB socket for charging

1971 was 50 years ago

Compatible with Canon RF-mount lenses (not included)

The 40mm focal length makes it a versatile all-purpose prime

and there may be a few others out there

Sigma APO Teleconverter 1.4X EX DG for Nikon F pentax adapter This G9 includes a PanasonicThe Sigma APO Teleconverter 1. 4X EX DG for Nikon F mount is a good quality, compact teleconverter for use with many (but not all!) Sigma F mount zoom lenses. It may also work with other brands, but we can't guarantee it. Please check your lens instruction manual for compatibility: this is not a universal teleconverter and it won't work with everything. In excellent condition, with clean glass and good function.