Product Details

• Color: White
• Brand: Tamron
• Model: AF20PN-700
• Dimensions: .43 pounds

Features

• Increases focal length from same camera position by 2x
• Superior performance for unsurpassed image quality and ease of use
• Fits easily between lens and camera body
• Includes carry case
• For use with Nikon Digital SLR cameras

Product Description

A Teleconverter is a great way to extend the focal length of your lens. This Teleconverter will extend the focal length of your lens by 2x giving more magnification. The Tamron Pro series Teleconverter offer superior optical construction for improved image quality.

Customer Reviews

Most helpful customer reviews

16 of 16 people found the following review helpful.
Excellent accessory
By Michael Gordon
A teleconverter is basically just a high quality concave lens that spreads the image wider, the sensor thus sees the center of this spreading. It is sort of like cropping and enlarging right in the camera. The result, in this case, is a doubling of the effective focal length -- a 200mm lens becomes a 400mm lens -- but you also lose 2 f-stops of light. F2.8 becomes f5.6.

I purchased this Tamron 2x teleconverter to augment Tamron's 70-200mm f2.8 telephoto zoom (hereafter called T70) on a Nikon D700 body. The combination then becomes a 140-400 f5.6 lens. The T70 and this converter cost together around a thousand dollars; but the Nikkor 200-400 f4 (the next thing better) is $6,000 and you get only one f-stop more light at six times the cost.

The good news is that it works.

I've tried three lenses on it so far. (1) The T70; (2) a Nikkor 28-300mm VR; (3) and a cheap 500mm "long lens". All three work well. There's not really much point in using a superzoom

The teleconverter includes a screw-focusing passthrough for your old lenses that are focused by a motor in the camera body, aperture stopdown ring and CPU coupling contacts. As always, make sure you have turned off your camera before adding or removing these things. If you do it anyway, you can remove the camera battery for a minute or so and that might reset everything. It did for me anyway.

Picture quality is better than expected, I would say excellent. No discernable chromatic abberation even at 200x previewing in Photoshop. Just a hint of spherical abberation. It doubles any defects in the lens attached to it so start with a good lens.

Autofocus -- In theory, yes, in practice it depends on the lens you use it with. The T70 already "hunts" a bit too much and the teleconverter merely increases its tendency to "overshoot". The 28-300 didn't autofocus worth a hoot but at f5.6 to start with, f11 effectively when doubled, that's not to wonder. Just put it in manual.

The front lens element mount is recessed 7/16 inch, or 11 millimeters, below the lens attachment mounting plate. Your lenses that project more than this beyond the mounting plate won't fit.

It is solidly constructed but relatively lightweight.

Altogether I am very pleased with it.

18 of 19 people found the following review helpful.
Better Than expected
By Sergio
I'm using this 2X teleconverter with a Nikon D-50 and a Tammron 100-400mm
lens. Its been fantastic. I'm hanholding the Camera mainly for Birding Phoptography and could not be more pleased.

17 of 18 people found the following review helpful.
Photos
By J. Rosenvold
So far, the only negative thing I have to say about the Teleconverter is that when I zoom out to 300mm, I cannot use autofocus. This probably won't be for your rapid shots. I enjoy seeing a larger or closer version of my shot without having to buy a much larger lens for my Nikon.