Junior Member Registered: January, 2013 Location: Texas Posts: 32 | Review Date: June 15, 2017 | Recommended | 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.
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Forum Member Registered: March, 2011 Location: Ontario Posts: 89 | Review Date: April 16, 2014 | Recommended | 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.
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Site Supporter Registered: January, 2007 Location: Toronto Posts: 17,869 2 users found this helpful | Review Date: May 30, 2008 | Recommended | 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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