Olympus Digital 1.4x Tele Converter EC-14 fish eye The back's insert is non-matching

The back's insert is non-matching

The Nikon TC-14E III is an autofocus teleconverter designed for select Nikon AF-S telephoto lenses (here's Nikon's compatibility list)

5 Rokkor lens has a touch of dust and minor coating marks

which ain't too bad for a "medium format" zoom lens

Olympus Digital 1.4x Tele Converter EC-14 fish eye The back's insert is non-matchingThe Olympus Digital EC 14 is a 1. 4x tele converter for Four Thirds digital SLR cameras and select lenses (check your lens user manual to be sure.) It provides a 1. 4x boost in focal length, steals one stop on light, and preserves autofocus in most situations. Light cosmetic wear, good function. Lens and camera are sold separately. PLEASE NOTE: This teleconverter is for the Four Thirds digital SLR system, not the Micro Four Thirds mirrorless system.