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Sigma 1.4x DG EX APO Teleconverter

Reviews Views Date of last review
6 30,781 Wed July 22, 2015
Recommended By Average Price Average User Rating
100% of reviewers $170.83 8.33
Sigma 1.4x DG EX APO Teleconverter

SIGMA EX APO DG Tele Converter. The DG means optimised for digital, but it is very similar to it's predecessor the Sigma EX APO 1.4x.

The new multi layer lens coating and lens design reduce flare and ghost, which is a common problem with digital cameras and also creates an optimum color balance through the entire zoom range.

Visit for compatibility details.

This PF thread is a comparison and discussion of 1.4x tc's. And this one is a discussion of diffraction issues.
Price History:

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New Member

Registered: October, 2009
Location: Millersville, MD
Posts: 7

1 user found this helpful
Lens Review Date: July 22, 2015 I can recommend this lens: Yes | Price: $225.00 | Rating: 10 

Pros: Very sharp
Cons: Pentax lens incompatibility
Camera Used: K5   

I bought one of these a few years ago. Shooting text at a distance, I found the lens to be very sharp. It compared well to the Tamron AF MC4 1.4x in sharpness.

The issue with this lens is that it is ever so carefully designed to only fit Sigma glass. You can put a Pentax lens on it (the 300 DA in my case) but the locking pin on the mount is cleverly placed so as as to only permit my Sigma telephoto on it. With the Pentax lens, the locking pin will not click in.

You can use it on a Pentax lens, but don't carry the lens around while mounted on the teleconverter or it will work its way free and take a nose dive...

Its an excellent lens, otherwise.

Registered: May, 2008
Location: London, UK
Posts: 982
Lens Review Date: May 15, 2011 I can recommend this lens: Yes | Price: $180.00 | Rating: 9 

Pros: Best TC I have ever owned
Cons: Only works with some Sigma lenses

Works extremely well with the Sigma 70-200mm APO EX (about 6yrs old, I think!) on the K-5, and "snaps" on in autofocus very rapidly - provided that the lens+TC is not already focused at a very different distance. However, if the lens+TC is focused at a very different distance then it can hunt.

Nevertheless, autofocus is much snappier than with the Sigma 2x version.

Results seem to be very good so far (although I have not made a critical comparison) on the K-5, and were always very good on the GX-10 with the same lens.

Bought cheaply in the UK about 2-yrs ago for 125 (about $180US ??) as a stock-clearance item from a big dealer when the normal price was nearer 170 - and they are now well over 200/$300
Senior Member

Registered: November, 2007
Location: Isle of Skye, Scotland
Posts: 262
Lens Review Date: August 12, 2010 I can recommend this lens: Yes | Price: $200.00 | Rating: 9 

Pros: Excellent optical and build quality
Cons: Not a 'universal' converter, expensive

It is important to note that this is not a 'universal' teleconverter (although to be fair, it isn't marketed as one either). The front element protrudes, so if the rear element of the lens to be fitted is flush with mount (such as a DA*50-135mm) you can't use it. There is a list of compatible Sigma lenses on the Sigma site at, but it should fit other third party lenses given the above caveat, but try it first.
Build quality is excellent. Used with my Sigma 100-300mm f4 there is little drop-off in quality and autofocus is retained, although it does sometimes hunt in low light. Also fine with my second-hand 300mm f2.8, although I'm still testing that one! Not cheap (I picked up a reconditioned model - list price is over 200) but then this is supposed to be pro grade equipment...
Site Supporter

Registered: August, 2009
Location: Elko, Nevada
Posts: 1,289

3 users found this helpful
Lens Review Date: April 29, 2010 I can recommend this lens: Yes | Price: $220.00 | Rating: 5 

Pros: Very well built
Cons: Didn't work with my lens

This really isn't a review of the teleconverter since I can't use them. It is actually a review of Sigma and the fact that their website doesn't provide the necessary information.

I purchased this TC (as well as the 2x TC) to use with my Sigma APO 70-200mm f/2.8 EX DG HSM II lens. Unfortunately I found that they did not work. When I reviewed the paperwork provided with these teleconverters my lens was not mentioned. Needless to say I am disappointed, particularly when the Sigma website was not clear about this at all. So, to help anyone else who may be considering picking up either of these TCs, the following lenses are listed in the paperwork as compatible.
  • Sigma APO Macro 180mm f3.5 EX IF - Manual Focus = Both
    Sigma APO 300mm f2.8 EX - Autofocus = Both
    Sigma APO TELE MACRO 300mm f4 - 1.4 = Autofocus - 2 = Manual Focus
    Sigma APO TELE MACRO 400mm f5.6 - Manual Focus = Both
    Sigma APO 500mm f4.5 EX - Manual Focus = Both
    Sigma APO 800mm f5.6 EX - Manual Focus = Both
    Sigma APO 50-500mm f4-6.3 EX RF = Manual Focus = Both
    Sigma APO 70-200mm f2.8 EX
= Autofocus = Both
Senior Member

Registered: November, 2007
Location: Bay area, CA
Posts: 192
Lens Review Date: September 9, 2008 I can recommend this lens: Yes | Price: $100.00 | Rating: 8 

Pros: Sharp, low profile
Cons: Only fit certain lens

This adapter has shown to be very sharp coupled with the 70-200 f2.8, makes a great 300mm f4 for birds and sports. It also works well with the Sigma 70mm macro and probably all Sigma DG lens of longer focal length.

the shallow design has a disadvantage: it wouldn't work with shorter focal lens, as the rear glass element of the lens will interfere with the coupler (But then again.. i don't know if this is symptomatic of all TC or just specific to this TC)

would have give it a 9 if not for the in-compatibility.
Veteran Member

Registered: March, 2007
Location: Queensland, Australia
Posts: 668
Lens Review Date: March 22, 2008 I can recommend this lens: Yes | Price: $100.00 | Rating: 9 

Pros: Cheap (for me, don't know about you!), does what it says on the box, pairs nicely with 70-200 f2.8
Cons: Slight reduction in AF speed, but that's expected

Picked this up for only AU $119 (currently about US$105), brand new, from a shop here in Adelaide, Australia. Was on backorder too so it was a damn good price!

Doesn't noticeably degrade image quality of the 70-200 f2.8, only adds 140g to the weight of the camera. 98-280 f4 for $119 - why not?? Which is 147-420 f4 on APS-C crop too!

Comes with dinky little cubic case and front & rear caps.
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