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SIGMA APO 1.4x EX Teleconverter

Reviews Views Date of last review
3 17,095 Thu June 15, 2017
Recommended By Average Price Average User Rating
100% of reviewers $250.00 8.67
SIGMA APO 1.4x EX Teleconverter

Similar in construction and physical parameters to the APO1.4x EX DG but released prior to optimized coatings for digital cameras.

1.4x Tc's discussion/comparison thread.
Price History:

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Junior Member

Registered: January, 2013
Location: Texas
Posts: 32
Lens Review Date: June 15, 2017 I can recommend this lens: Yes | Price: None indicated | Rating: 9 

Pros: Image Quality, light
Cons: For Tele only
Camera Used: Pentax K30, K70   

This Tele-converter 1.4x is the best I ever used in terms of image quality. Vastly superior to all the 4 elements converters out there.
It is also very light and small.

Some negatives though:

- I dislike the 'Sigma EX' finish, it peels after a while.
- Some lenses will transmit their focal info through the Sigma converter, and the camera will believe that the focal is the one of the lens instead of 1.4x that focal. Can be a problem for the stabilization system.

I used it with many lenses, with excellent results: Pentax A 135/2.8, FA* 200/2.8, A 200/4.0. Focusing with manual focus lenses + converter is not easy with modern digital SLRs.
Forum Member

Registered: March, 2011
Location: Ontario
Posts: 65
Lens Review Date: April 16, 2014 I can recommend this lens: Yes | Price: $250.00 | Rating: 8 

Pros: Farily decent 1.4 TC for shorter lenses, AF
Cons: Mount was a bit sloppy
Camera Used: PZ-1, Z1-p, i*stD   

Not too bad, and the AF worked well with larger aperture lenses although it was understandably a bit slower. Was best with lenses under 300mm in FL. Did not work very well with my Tamron 300/2.8 or my Pentax FA* 600/4. Image degradation was noticeable with my A* 200 macro. I sold this to buy the Kenko 1.5 SHQ, which was much less expensive.

Registered: January, 2007
Location: Toronto
Posts: 15,765

2 users found this helpful
Lens Review Date: May 30, 2008 I can recommend this lens: Yes | Price: $250.00 | Rating: 9 

Pros: no noticible loss of IQ
Cons: front element interferes with many lenses

The 1.4x TC is an excellent paring with the APO 70-200 EX lens and offers no noticible loss of image quality on that lens.

The only real drawback with the TC is that sigma's design has the front element very far forward and this does interfere with many lenses. It is definitely not indended as a universal TC, but meant specifically for long sigma lenses, and some pentax lenses.

It should be noted that the TC passes all lens data directly through the contacts, and as a result, focal length and apature reported are those of the prime lens, not the resulting combination. This leads to incorrect focal lenght setting for shake reduction, and on the K10D an error in metering, where it overexposes consistently by 1-1.5 stops. This can be managed by using exposure compensation or manyal exposure settings.
Exposure is NOT impacted when this is used on the *istD. No commnet as to exposure accuracy on other cameras as these are the only 2 I own
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