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 1.4x giving more magnification. The Tamron Pro series Teleconverter offer superior optical construction for improved image quality.

Product Details

• Color: White
• Brand: Tamron
• Model: AF14PN-700
• Dimensions: .45 pounds

Features

• Increases focal length from same camera position by 1.4x
• 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

From the Manufacturer
Simply fit a Tamron teleconverter between the lens and the camera body to increase a lens focal length, giving you extended telephoto capabilities so you can take photos with greater magnification from the same camera position. Tamron's AF teleconverters are compatible with most AF (autofocus) and autoexposure cameras.

SP for "Super Performance"
Tamron's SP-series lenses are designed to achieve top optical performance. Ground breaking design concepts give these lenses unsurpassed image quality and ease of use while setting new standards for future generations of lenses.

Customer Reviews

works well for what it does
I have been shopping for a fast (large apperature=small number) longer lens than a nikon 80-200mm f/2.8D that I use. I have a longer sigma lens, but it has a slower apperature (f/5.6-6.3). Fast lenses are quite expensive, so I looked at other approaches & arrived at teleconverters to extend the length of my 80-200mm lens. I read a lot online (the above review was not helpful, no offense) prior to deciding to give this tamron SP pro 1.4X TC a trial.
First off, I found it used at a reputable on-line camera outlet for about $50 less than the $180-$190 retail price as of late 2008.
Basically, it works OK -- Using a D-300, I've tried it with the 80-200mm f/2.8 (which turns it into roughly a 112-300mm f/4 lens) and the autofocus is still very quick. The quality of hte photo appears about normal (a steady tripod would probably be very helpful; i was using a monopod).
Though not recommended for lenses "slower" (larger number) than f/2.8, I tried w/ a Nikon 70-300mm, f/4.5-5.6, AF-S VR lens and was pleasantly surprised that it took decent photos --it focused OK, the VR seemed to remain operational, and the quality was OK-- as long as there was sufficient light. I did note the lens hunting for focus more in low light, but i was able to manually focus when necessary. Finally I tried the TC on an old manual focus Nikon 100mm f/2.5 lens (adapted for use w/ current Nikon DSLRs) and liked the quality, but need to further try this combo to better discuss.
Some considerations: the 1.4x multiplication of focal length comes at the expense of one stop (e.g. f/2.8 becomes f/4-- not as quick). Also, the EXIF data (camera metadata) reports the f-stop and focal length as if the teleconverter wasn't there-- at least on the lenses i tried the TC with. So, when looking via view finder, I still saw "f/2.8", though I knew in reality that meant "f/4"-- a little confusing.
Anyway, I think the TC will be a helpfult tool, as i learn to use it more.
Just wanted to add somehting to the discussion that might be helpful to you as you ponder how to "stretch" your photography "wants" in light of your real-life budget... Take care.
Pablo

Not too bad
I have a Nikon D60 and a 70-300mm F4-5.6 AF-s VRII lens. Not being able to purchase Nikons 4-600mm lenses ($2,500-10,000)but needing a little longer reach for surf and bird photography I chose to try this Tele-converter.
The auto-focus works ok in bright light, the VR works too, to my surprise, unfortunately image quality is not top notch but well enough that most photos come out pretty good. Exif data does not show the extra length of the lens, 300mm to 620mm.
I have learned that shutter priority is best and let the camera control aperture. F8,9,10,11 being the best. I took photos at a canoe race today from shore and got pretty descent shots. The Kenko pro 1.4 supposedly the same as this Tamron just different names. I do recommend this if you need longer reach but can't afford Nikons high end lenses. [...]

Tele Converter for Nikon D80
I wasn't very impressed with this for my Nikon D80 SLR. It was my understanding from the website this would work with digital cameras, but the literature received with the lens indicated this is not the case. My photos with this were a bit fuzzy. Not satisfactory at all and I returned it.