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2 61606 9/27/2013
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Keywords: Sigma Canon Minolta Nikon Pentax Sony TC 1.4X AF EX APO tested


Registered: December 2008
Posts: 31
Sigma 1.4X EX DG APO review by andre_
Review Date: 9/27/2013 Would you recommend the product? Yes | Total Spent: None indicated| Rating: 7 

Pros: Awsome with 150mm Macro
Cons: No AF over f5.6 (Nikon), de facto only for Sigma lenses

I use this TC with the Sigma 150mm f2.8 Macro (pre-OS) on a Nikon, and the results are outstanding.
Even with the D800 the ensamble is sharp enough at full aperture ("f4"), and a razor when stepped down.

Almost no decay in the bokeh and absolutely no CA in any condition.

But, but...
This Converter is mechanically incompatible virtually with every lens but Sigma.
This could be not an issue, since the compatible Sigma lenses have a particular design for mounting the TC, and the results are very high in average.

But, again...
With Nikon mount, Sigma has limited the AF functionality when the luminosity of the lens+TC is over f5.6.
But both my D800 and D600 have an AF system that works well til f8!
And also my old D2x and D700 worked well, covering the electric contact in order to "cheat" with the electronics and hide the TC to the body.

Why the hell I cannot use the autofocus with my Sigma 500mm f4.5 plus the teleconverter ("f6.3" as result)?

Pity, because the optical results are decent, but an MF lens of over 700mm is impractical, at least.

Registered: October 2005
Posts: 12
Sigma 1.4X EX DG APO review by sivrajbm
Review Date: 9/18/2007 Would you recommend the product? Yes | Total Spent: $160.00| Rating: 9 

Pros: Sharp, Fast, good construction
Cons: None

A Very Good TC for the $$$. On my 70-200 it is as sharp as without the TC. I didn't notice any degradeing of speed or IQ. The colors are still vibrant and the contrast is still good. Sigma scores again.


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