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6.9.2011

On paper, a tele-converter with a only a modest 40% magnification and one that costs a minimum of a couple of hundred looks like a poor return. When it's only 2 centimetres in length, even more so.I considered and tried one with my old Nikkor 80-400 VR a few years ago but that lens cannot accept teleconverters as the rear lens element is flush with the lens mount. Now, that's been replaced by the Sigma 150-500mm OS, which DOES accept a converter and this one is matched for it.I also wanted a converter for my (also matched) Sigma 70-200mm f2.8 APO; which in effect comes a 100-280mm f4, on my Nikon full-frame D700. Or, a 140-420 f4 on my DX Nikon D7000.Those impressive statistics are of any use only if the lens can still be used at maximum aperture, with confidence.Results so far show that one can. A 1.4 converter loses one stop of light and many pro's, specially sports photographers will use their camera maker's own converters without question.This Sigma is superbly engineered, made in Japan and is a real pleasure to use. Solidly made, nicely finished, it instils confidence. With a 'matched' Sigma lens, not only is AF and OS (optical stabilising) assured, but the effective aperture is displayed on the camera and in any metadata. I should say that Sigma do not suggest that AF is usable with the 150-500. That seems to be the case, now that I've tried it. But when you consider that an already slow max aperture of f6.3 becomes a very dim f9. The lens/camera just doesn't seem to try to autofocus. Whilst the 150-500mm is very usable in its normal state, I couldn't tame it handheld. Results looked OK but camera shake just took the edge off, despite the optical stabilising. But, we are talking about a focal length of 700mm (on FX format) and about 850mm on DX and previously such magnifications didn't exist, and frankly it's insane not to only use this combo on a tripod!I also wanted a decent converter for my pro-quality Tamron 70-300mm SP VC USD. To turn it into a 100-400mm on the D700 and a 140-560mm on the D7000. This was chancing things as Sigma, quite understandably, do not recommend any other lens' usage other than their own. They wouldn't, would they? But, not only does the AF work fine, but the VC (vibration control) really kicks in and one can more easily handle the extended focal length. The modest spec of this converter means even wide open, the Tamron still gives a crisp image, though, as with any lens attached to it, stopping down a stop should improve that further. On scrutiny, (image viewed at 'actual pixels', in Photoshop) centre was still crisp, sharp and contrasty but edges were lagging and the inner corners, frankly, soft. Having said that, other teleconverters I've used before had colour fringing along with those poor corners and into the edges, also. Along with simply an obvious compromise in the middle. The higher spec Sigma 70-200mm f2.8 Apo fares better than the Tamron, which is to be expected and I'm sure fixed focal, fast telephotos, will give the best, with very little compromise. I can't afford any of those; one of the reasons why I use a teleconverter in the first place!However, I've had better results with the cropped frame D7000 and Tamron. I can only presume that the FX Tamron is using more of the centre of the image when used on the DX D7000. A shot of the moon just after dawn, handheld (with VC) focal length 560mm could be cropped and every crater is crisply shown - I was really amazed! I suspect that atmospheric haze softens such an image more than a poor lens but this you could almost see where Armstrong & Co landed.Pro sports or wildlife snappers often only need the centre of the image as the action could well be even further away than the extra magnification can get them to. This converter used for such shooting will definitely not disappoint anyone. Landscapes that need overall sharpness, less so, but photos still look good. Remember also, that haze at infinity reduces contrast enormously, as does heat haze and images may initially look disappointing, compared to ones at a lesser focal length.At the end of the day, flexibility and practicality are a good teleconverter's main attributes. This one is the one to aim for; you may get better with Nikon's or Canon's own but they're even more expensive and if you, like many of us own and use independent lenses, I would suggest that this being the ultimate.
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16.6.2020

I had toyed with the idea of buying the Canon 1.4X Mk3 extender, to extend the reach of my 100-400mm Canon L series Mk1 lens but couldn't really justify £400. Having already got a Sigma 2X EX DGO extender used with my Sigma 70-200mm 2.8, I found that it unexpectedly fitted and worked with the Canon 100-400. I wanted the 1.4X to extend the reach but without too much image degradation. This extender gives brilliant results, the autofocus works quickly with both of the aforementioned lenses on Canon 80d and Canon Eos R bodies. I have compared shots at 400mm (without converter) against this with 1.4X (560mm) and am hard pressed to see any difference in image quality.Neither Canon or Sigma will admit that this combination works, but it does. Save the circa £200 pounds and invest elsewhere. Just to test the theory a little further (and a bit of fun), I stacked the 1.4X with the 2X on the 100-400... It worked! autofocus only in the middle on my EOS R (though Autofocus did not work at all with Canon 80D). Shots were useable but less contrast and more noise (not really recommended). Clearly I can only speak for the combinations above (and of course even canon extenders don't work with all canon lenses). I wanted to 'put this out there' as I could not find the answers anywhere online. Excellent quality bit of kit, highly recommended.
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15.4.2018

First things first: this only works with certain lenses. Sigma publish a compatibility list on their website, so check that first. If you try and mount an incompatible lens on this, the protruding front element might grind against the back element of your lens and cause damage. I use this with the Sigma 70-200mm f/2.8 APO EX DG HSM Optical Stabilised Telephoto Lens Canon Fit. It works wonderfully on both my cropped sensor and full frame sensor bodies. With the teleconverter, the length is increased to 98-280mm, which on a crop sensor camera is the equivalent of 157-448mm when taking the 1.6 x crop factor into account. I haven't spotted any impact on image quality,neither does the autofocus speed or accuracy seem any slower. So it does exactly what it says with no real compromise except the fact the maximum aperture is reduced from f2.8 to f4 (par for the course with teleconverters). Great bit of kit. Also comes with front and rear caps and a good (if slightly oversized) lens pouch.
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28.11.2010

For specific use with specific Sigma internal focus (IF) lenses, this 1.4x EX DG APO teleconverter delivers superb additional magnification without any loss of image quality (IQ).It can be, or seems to be expensive for what it is, but if you need the additional focal length for use on a Sigma telephoto lens, this is the one to go for as it's perfectly matched with the parent lens with an aperture of F4 or less to retain auto focus and you only lose 1 stop of light, so on an f4 lens it will equate to f/5.6 or on an f/2.8 lens, f/4.

22.10.2017

Arrived in good time in good order, for use on my Canon 5D Mark ll with a Sigma APO 150-500 F5-6.3 DG OS HSM, you loose auto focus but the steady feature still operates. 1 stop light loss doesn't seem to be too much of a problem, a carbon fibre monopod is a big help. You must make sure the converter fits the lens you plan to use it with, there are two 1.4x and two 2x by Sigma.

1.12.2012

I shall keep this short and sweet. The Sigma 70-200mm f2.8 is great enough. When this is on the end of it, even more of a result. It gives you 280mm, and yes ok, the f-stop goes down to f4, but there is no drop in performance that i have noticed. So brilliant!

27.3.2015

Definitely fits the Sigma 105mm Macro lens and also the 150 - 500 tele-zoom lns, but doesn't match with other (non-Sigma) lenses I have.Not an issue, but it would have been handy if it had alson fitted ordinary Nikkor/Nikon lenses.

18.10.2016

A decent bit of kit. Turns my Sigma f2.8 70-200 lens into an f4 98-280 which equates to an f4 147- 420 lens on my 1.5 crop factor Nikon D3200. Great for wildlife shots! No comprise to the quality of photos taken by my camera.

24.3.2014

Bought this with the 180mm f2.8 Macro and it works very well.Image quality does not seem to be affected.Does exactly what it says on the tin.

14.5.2017

This unit is constantly on my Nikon camera - works really well when taking sports photography

5.10.2014

Excellent image quality. It's never off my Sigma 120-300 f2.8

14.7.2017

Works just as it should, nothing more to say

18.7.2014

excellent even works in af on my 70-300.

21.1.2016

very good

4.8.2014

OK

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