Sigma 1.4x and 2x APO autofocus-compatible telconverters for Nikon mount lenses and any Nikon T-ring. These teleconverters were purchased new for testing against other brands for astrophotography, and were by far the best of those I tried in sharpness in the corners of the 35mm frame. I haven't used them since the test shots, and only shoot medium format now, so these are in like new condition in all respects. The 1.4x has a soft nylon pouch, the 2x comes with a semi-rigid nylon case, and both are in their original packaging with all original papers. New prices for these are $159(1.4x) and $179(2x).
My prices (firm) include shipping to the lower 48.
1.4x - $125
2x - $145
USA buyers only, please.