Sigma APO Teleconverter 1.4X EX DG for Nikon F pentax adapter so you'll want to be

so you'll want to be sure that you choose the right tool for the job

sharp prime lens for Nikon full frame SLR and DSLR cameras- and it's pretty compact

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

1971 was 50 years ago

Sigma APO Teleconverter 1.4X EX DG for Nikon F pentax adapter so you'll want to beThe 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.