Product Description
This product is a dedicated APO teleconverter that can be mounted between select lenses and the camera body to increase the focal length by the power of 1.4. It is compatible with the lens autofocus function, depending on the open-aperture F value of the lens being used, and it works with the AE (Automatic Exposure) function, dispensing with complicated exposure calculations. It also offers maximum photography magnification by 1.4x, without any variation in the minimum focusing distance. Compact and lightweight, this teleconverter converts your lenses into longer focal-length lenses, so you don't have to do a lot of unnecessary footwork.
Amazon.com Product Description
The Sigma APO Teleconverter 1.4x EX DG for Canon Digital SLR Cameras is a dedicated APO teleconverter that can be mounted between select lenses and the camera body to increase the focal length by the power of 1.4. The multi-layer coating reduces flare and ghosting, which is a common problem with digital cameras. The lens also offers maximum magnification without any variation in the minimum focusing distance. Compact and lightweight, this teleconverter can convert your lenses into longer focal-length lenses, so you don't have to do a lot of unnecessary footwork. A case for the lens is included.
Customer Reviews:
Sigma APO Teleconverter 1.4x EX DG for Canon Digital SLR Cameras.......2007-11-21
I did a lot of research on this item before I bought it. Nowhere did I read a bad review or rating and most buyers raved about how their pics remained sharp as a tack with the Sigma 120-300 mm f2.8 lens, but this is not what I experienced. All my pics are now slightly out-of-focus when I use this lens so I no longer use it and mark it off as a bad purchase.
Great match-up with the Sigma 70-200, f2.8 that gives you a 100-300, f4 zoom .......2007-07-14
Optically outstanding when combined with the Sigma 70-200 f2.8 EX DG. This new Sigma EX DG lens and converter is super sharp and great color that stacks up to the famed Canon L series at about 60% of the cost. I see incredible clarity at 800% magnification doing touch ups in Photoshop.
I've used both and wouldn't hesitate a second buying the Sigma DG series again.
Advanced amateur who loves Canon.
Sigma APO Teleconverter 1.4x EX DG for Canon Digital SLR Cameras.......2007-05-29
Not compatable wth Cannon lens only selected Sigma lens
Excellent piece.... worth to buy........2007-03-20
This is an Excellent piece from Sigma, I've tried it on my APO MACRO 150mm F2.8 EX DG HSM and CANON 20D Body,the results was marvelous, no loose of sharpness, seems to be part of the original lens, you can sell your photos even ..What else ..?
The only thing I didn't like is that,with the 150mm macro lens,the 1.4x APO Tele Converter, AF operate between infinity and 0.52m, If the subject is closer than 0.52m, only MF is available,also similar case with 180mm macro ,but with different figures.
With other compatible lenses like (APO 300mm F2.8 EX DG HSM) it work fine with AF.
Finally I recommend this one over the 2X for Sigma compatible MACRO lenses, since the auto focus still working.
Product Description
Increase the versatility by adding a Sigma EX Apo Tele-Converters to Sigma 180mm f3.5 EX lens. By using the 1.4x EX Apo Tele-Converter, you can increase the magnification to up to 1.4:1 or retain same life-size reproduction at an even greater working distance, great for photographing difficult subjects like butterflies or small animals, which can be difficult to approach.
Amazon.com Product Description
Sigma's 1.4X APO teleconverter lens features gives you a high-performance optical design with five elements in three groups. It is optimized for use with long telephoto and telezoom lenses, and is ideally suited for use with the 70-200mm F2.8 APO EX HSM zoom lens. Using 10-pin electrical interfaces, there is no loss of autofocusing speed when these teleconverters are used with compatible HSM type lenses. This model is dedicated to Canon AF SLR cameras.
Customer Reviews:
Bargain alternative to Canon's 1.4x Teleconverter?.......2000-10-20
The Sigma APO teleconverter is a little more than half the price of the Canon teleconverter, and it boasts an APO element to reduce chromatic aberration. I've found this teleconverter to be reasonably sharp, but there is noticeable vignetting when I use it with my Canon 300mm f4. Sigma claims that the teleconverter is designed to be matched with their high-end tlelphoto lenses, and perhaps this is the case. However, I wasn't very satisfied with the performance of this teleconverter.
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