Sigma APO DG EX 2x TC

jayman_1975 · 02-10-2015, 06:34 PM

Anyone have any experience with this? I have the 1.4 and was thinking of buying this one to put on my 100-300 F4 to get me to 600mm. Would I be at F8 with this one?

**sergysergy** · 02-10-2015, 06:42 PM

I liked the Sigma 1.4x on my 70-200. The 2x not so much. It was not terrible but you could tell that quality was not as good.

**clackers** · 02-10-2015, 06:53 PM

Originally posted by jayman_1975

Anyone have any experience with this? I have the 1.4 and was thinking of buying this one to put on my 100-300 F4 to get me to 600mm. Would I be at F8 with this one?

Unfortunately, you will be - and that's wide open. Good luck getting auto focus to work as advertised, Jayman! :-(

**sergysergy** · 02-10-2015, 06:54 PM

With good light I had no problems.

VoiceOfReason · 02-10-2015, 06:58 PM

I've gotten a 2x tc to work with my Sigma 150-500 at 500 and AF, but the IQ left something to be desired. It still worked both in good light with a high contrast target or the moon at night!

**Lowell Goudge** · 02-10-2015, 11:14 PM

I use the 1.4x and 2x sigma TCs with my APO 70-200/2.8 EX (non DG non macro version) all the time.

I have found for most things the quality is excellent. I have even coupled the two together to get out to 560mm and been able to achieve auto focus lock, when you do this,my ou must put the 1.4 behind the 2x due to the protruding front elements, the 1.4 x is to thin to accept the 2x behind it.

My lens is an early sigma lens, from the end of the film era. I have seen reviews and reports that suggest newer versions, especially those with Macro in the lens name, get soft at longer focal lengths.

I can't say on the 100-300 how performance will be, other than to try, but I note you may not get AF confirmation with the lens being at F8 other than in extremely bright conditions.

zman · 02-11-2015, 08:57 AM

Originally posted by Lowell Goudge

I have even coupled the two together to get out to 560mm

I have the same lens and TC's and never thought to combine them. Can't wait to try it out. Thanks for the idea.

jayman_1975 · 02-12-2015, 11:40 AM

Thanks for the info. I think I'll just stick to my 1.4.

Stavri · 02-12-2015, 11:50 AM

I used my 100-300mm f4 with a 2x tc but didn't like the results. The lens loses about 30% AF speed in nailing focus (but the 100-300 is plenty fast as it is) The 2x is meant to cater to the faster f2.8 lenses. The 1.4x was a better match in my experience

jeallen01 · 02-13-2015, 11:54 AM

Sold my Sigma 2x as the autofocus with the 100-300 F4 was pretty poor - the 1.4x is much better (same effect with both the original K-5 and the K-3)

**clackers** · 02-13-2015, 05:12 PM

To keep within the f5.6 advice for AF, 2× is good for f2.8 lenses, 1.4x for f4 ones. All bets are off beyond that.

Anyway, for wildlife amongst foliage etc you'd MF to stop getting razor sharp images of twigs. :-)

02-10-2015, 06:34 PM	#1
jayman_1975 Veteran Member Join Date: Jun 2014 Posts: 385	Sigma APO DG EX 2x TC Anyone have any experience with this? I have the 1.4 and was thinking of buying this one to put on my 100-300 F4 to get me to 600mm. Would I be at F8 with this one?

02-12-2015, 11:50 AM	#9
Stavri Veteran Member Join Date: Aug 2014 Location: at a Bean & Leaf Photos: Albums Posts: 1,832	reached the IQ threshold I used my 100-300mm f4 with a 2x tc but didn't like the results. The lens loses about 30% AF speed in nailing focus (but the 100-300 is plenty fast as it is) The 2x is meant to cater to the faster f2.8 lenses. The 1.4x was a better match in my experience

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02-10-2015, 06:42 PM	#2
sergysergy Site Supporter Join Date: Jan 2011 Photos: Gallery Posts: 5,170	I liked the Sigma 1.4x on my 70-200. The 2x not so much. It was not terrible but you could tell that quality was not as good.

02-10-2015, 06:53 PM	#3
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by jayman_1975 Anyone have any experience with this? I have the 1.4 and was thinking of buying this one to put on my 100-300 F4 to get me to 600mm. Would I be at F8 with this one? Unfortunately, you will be - and that's wide open. Good luck getting auto focus to work as advertised, Jayman! :-(

02-10-2015, 06:54 PM	#4
sergysergy Site Supporter Join Date: Jan 2011 Photos: Gallery Posts: 5,170	With good light I had no problems.

02-10-2015, 06:58 PM	#5
VoiceOfReason Site Supporter Join Date: Jun 2010 Location: Mishawaka IN area Photos: Albums Posts: 6,124	I've gotten a 2x tc to work with my Sigma 150-500 at 500 and AF, but the IQ left something to be desired. It still worked both in good light with a high contrast target or the moon at night!

02-10-2015, 11:14 PM	#6
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,887	I use the 1.4x and 2x sigma TCs with my APO 70-200/2.8 EX (non DG non macro version) all the time. I have found for most things the quality is excellent. I have even coupled the two together to get out to 560mm and been able to achieve auto focus lock, when you do this,my ou must put the 1.4 behind the 2x due to the protruding front elements, the 1.4 x is to thin to accept the 2x behind it. My lens is an early sigma lens, from the end of the film era. I have seen reviews and reports that suggest newer versions, especially those with Macro in the lens name, get soft at longer focal lengths. I can't say on the 100-300 how performance will be, other than to try, but I note you may not get AF confirmation with the lens being at F8 other than in extremely bright conditions.

02-11-2015, 08:57 AM	#7
zman Pentaxian Join Date: Sep 2009 Location: Western NY Photos: Albums Posts: 515	Originally posted by Lowell Goudge I have even coupled the two together to get out to 560mm I have the same lens and TC's and never thought to combine them. Can't wait to try it out. Thanks for the idea.

02-12-2015, 11:40 AM	#8
jayman_1975 Veteran Member Join Date: Jun 2014 Posts: 385 Original Poster	Thanks for the info. I think I'll just stick to my 1.4.

02-13-2015, 11:54 AM	#10
jeallen01 Pentaxian Join Date: May 2008 Location: London, UK Posts: 1,697	Sold my Sigma 2x as the autofocus with the 100-300 F4 was pretty poor - the 1.4x is much better (same effect with both the original K-5 and the K-3)

02-13-2015, 05:12 PM	#11
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	To keep within the f5.6 advice for AF, 2× is good for f2.8 lenses, 1.4x for f4 ones. All bets are off beyond that. Anyway, for wildlife amongst foliage etc you'd MF to stop getting razor sharp images of twigs. :-)