Product Description

A Teleconverter is a great way to extend the focal length of your lens. This converter will extend the focal length of your lens by 1.4x giving more magnification.

Product Details

• Color: Black
• Brand: Tamron
• Model: AF14C-700
• Dimensions: .70" h x 2.60" w x 2.00" l, .40 pounds

Features

• Increases focal length from same camera position by 1.4x
• Powerful and creative options for your telephoto photography
• Fits easily between lens and camera body
• Includes carry case
• For use with Canon EOS and IX APS cameras

From the Manufacturer
Simply fit a Tamron teleconverter between the lens and the camera body. This increases the focal length and gives 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.

All our AF teleconverters and AF extension tubes for Canon EOS are also compatible with Canon EOS "IX" camera for APS system.

What's in the Box:
Lens and case

Customer Reviews

Auto-Focus Still Works!!!!!
I'm using this teleconverter on a Canon 100-400L lens with my Canon 20D and 5D. The autofocus still functions just as the manufacturer claimed it should, and it even seems to focus just as fast as before. There is a detectable drop in sharpness however, which is to be expected with any teleconverter, especially when you're using a zoom lens. This TC would be an ideal choice for people with prime lenses who need autofocus intact (i.e. for birds in flight) and maybe for zoom lens owners who don't intend to make big enlargements or crop their prints heavily.

I was able to compare it with the more expensive Tamron 1.4x Pro and found absolutely no difference between the two in image quality. Autofocus doesn't even work with the Pro version when you've got a slower lens like mine (f/4.5-5.6) and Tamron even says there's no real advantage to the Pro TC unless you've got a fast 2.8 lens.

I only wish I owned a prime telephoto lens to check if it's worthy of a five star rating.

buying a 400mm lens,someday.
i mainly ordered this for my canon 70-200L lens but noticed a loss of sharpness and not enough zoom for my needs.it did seem to work ok on the 28-105 with no auto focus problems, on both lenses.maybe the canon version is sharper but its a bit over priced.i may sell the 70-200 and get the 100-400L with image stabilize, when i can afford it.

Things missing from description
I opened the box and saw those descriptions were missing from the Amazon product descriptions:

From Tamron manual in the box -

"For best results, use the Tamron tele-converter with telephoto lenses ranging from 50mm to 135mm."

"When used on Digital SLR cameras: This teleconverter is not designed for digital use. We do not guarantee its performance when used on Digital SLR cameras."