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11-09-2018, 06:09 AM   #1
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Sigma 1.4 TC DG vs non DG version

Hi
I own sigma 300 2.8 non DG version and I Want to buy TC.
Is there any diferences beetwen two versions?
I Think the non dg will match my lens perfect but may be DG is better.
I have a chance to buy a non dg for a fair price.
What to do?
thanks in advance and sorry bad English

Paco from Spain

11-09-2018, 07:18 AM   #2
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This one?SIGMA APO 1.4x EX Teleconverter:
SIGMA APO 1.4x EX Teleconverter Lens Reviews - Miscellaneous Lenses - Pentax Lens Review Database

Vs. This one?
Sigma 1.4x DG EX APO Teleconverter: Sigma 1.4x DG EX APO Teleconverter Lens Reviews - Miscellaneous Lenses - Pentax Lens Review Database


They both have pretty good ratings.
11-09-2018, 08:45 AM   #3
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Yes.
My lens is a sigma 300 2.8 non DG, wich is the best one for this lens?

Non DG pros is that this tc is exactly for this lens, same age and tecnology and cheaper
DG pros are better coating and flare resitence in theory.

I would know if there is any diferences as autofocus speed and accuracy.

Thanks
11-09-2018, 02:10 PM - 1 Like   #4
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Truly it is very hard to tell without testing. As you say, the older one was designed with the older lens in mind.

I have both. I could test on the A*300mm 2.8 lens for you to see if there is any difference - today I have not used either on that lens.

what camera?

11-09-2018, 03:13 PM   #5
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K3ii&k1ii
11-09-2018, 06:58 PM - 1 Like   #6
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I can do K3ii and K1
11-09-2018, 09:02 PM   #7
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Wild Mark it would be perfect if you can test both or them.
Thnks
4 Days Ago - 1 Like   #8
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Ok here goes. All shots taken with A*300mm 2.8

First series is the K3ii with Sigma AF 1.4x teleconverter at f2.8 and f5.6

https://www.pentaxforums.com/userreviews/sigma-x14-tele-converter-af.html

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Last edited by Wild Mark; 3 Days Ago at 05:48 PM. Reason: wrong teleconverter
4 Days Ago - 1 Like   #9
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Next series is the K3ii with the Sigma APO 1.4x EX teleconverter at f2.8 and f5.6

https://www.pentaxforums.com/userreviews/sigma-apo-1-4x-ex-teleconverter.html
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Last edited by Wild Mark; 3 Days Ago at 05:49 PM. Reason: wrong teleconverter
4 Days Ago - 1 Like   #10
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Next series is the K1 with Sigma AF 1.4x teleconverter at f2.8 and f5.6
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Last edited by Wild Mark; 3 Days Ago at 05:50 PM. Reason: wrong teleconverter
4 Days Ago - 1 Like   #11
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And the last series is the K1 with the Sigma APO 1.4x EX teleconverter at f2.8 and f5.6
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Last edited by Wild Mark; 3 Days Ago at 05:51 PM. Reason: wrong teleconverter
4 Days Ago - 1 Like   #12
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Crops of the Sigma AF 1.4x and Sigma APO 1.4x EX at f2.8

---------- Post added 17-11-18 at 05:04 PM ----------

There is almost no difference between the TCs. With these results I would go for the cheaper option.
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Last edited by Wild Mark; 3 Days Ago at 05:51 PM. Reason: wrong teleconverter
3 Days Ago   #13
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Clarification Needed

My apologies to all. I have NOT tested the DG version. Rather, I have tested the following

Sigma EX 1.4x TC

SIGMA APO 1.4x EX Teleconverter Lens Reviews - Miscellaneous Lenses - Pentax Lens Review Database

Sigma AF 1.4x TC

Sigma X1.4 Tele Converter AF Lens Reviews - Miscellaneous Lenses - Pentax Lens Review Database

Without testing the DG version I would not recommend for the K1 as it might be designed for APS-C (if so it could vignette - but others need to add their experience here)

I have edited prior posts to reflect this error - apologies
14 Hours Ago   #14
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I have got the sigma 2x DG TC. It doesnot vignetye on the K1 , I suposse 1.4 doesnot do with the k1.
12 Hours Ago   #15
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sigma nomenclature
lets be pragmatic about it. in the film era all sigma lenses were full frame, they had to be. the top of the line was the EX series.
when DSLRs first came out, you still bought a film lens because the "digital coatings" were still some time off. so when i bought the Sigma 70-200/2,8 EX and the Sigma 1.4x EX teleconverter this is how the optics were marked.

about 2 years later sigma came out with not only DC lenses for cropped sensors, but also DG lenses, which were full frame lenses with digital coatings. many of their first series were simply the same film lenses with digital coatings.

so what are digital coatings, specially they include coated rear elements to prevent reflections and clouding (reduced contrast) from incident light bouncing off the filter in front of the sensor, which is much more reflective than the emulsion side of film. non digital lenses sometimes have very low contrast when shot on a DSLR or a hazy low contrast donut in the middle of the frame

with the sigma 70-200/2.8 EX (non DG) or with the 1.4 x teleconverter i have never had an issue indicating that sensor reflection was systemic issue with either the lens or the TC

if you are going to purchase a TC today, there is no option for a new TC, you only get the digital one because the standard one went out of production about 14 years ago, but it wont make any noticeable difference in my opinion
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