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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 14 Oct 2014 (Tuesday) 17:35
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TC's..........

 
Rgpracer
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Oct 14, 2014 17:35 |  #1

Wanting to buy a 1.4 or 2x TC for my 70-200 F4. I put a WTB on the site, and after talking to several people, think that I want to go with a Kenko brand. One of our members has a Sigma 1.4 and 2x for sale if I am interested.
I don't know anything about the sigma brand. I like their lenses, but what about quality TC matched to my 70-200? Good/bad/indifferent? Many people have given me advice on the Kenko and the Canon, but have not heard anything about the Sigma's.
Thanks to all.
ICT



  
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timbop
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Oct 14, 2014 21:14 |  #2

definitely NOT a 2x TC; they hurt image quality a lot and unless you have a 1 series or 5d mark 3 then a 2x TC on your 70-200/4 will not auto focus. Kenko or sigma should be about the same


Current: 2x5DM3, 8mm fish, 17-40/4, 24-105/4IS, 35/2IS, 70-200/4IS, 85/1.8, 135/2, 580's and AB800's
Formerly: 7D, 300D, 5D, 5DM2, 20D, 50D, 1DM2, 17-55IS, 24-70, 28-135IS, 40/2.8, 50/1.8, 50/1.4, 70-200/2.8IS, 70-300IS, 70-200/2.8, 100 macro, 400/5.6, tammy 17-50 and 28-75, sigma 50 macro & 100-300

  
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RileyNZL
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Oct 15, 2014 00:09 |  #3

If your wanting to use a 2x you might want to look at getting a 70-200 f2.8? Alternately, just by one a tamron/sim 150-600mm for half the price and probably get better IQ and AF speed then using a 2x on another lens.

Also from what I've seen, using the same brand extender as the lens seems to give the best performance (ie sigma extender on a sigma lens), although I don't know where kenko fits into that.


Canon 1Dx |Canon 6D|Canon 24-70 F2.8 L MkII|Canon 16-35 F4 L|Sigma 70-200 F2.8 EX OS|Canon 400mm f5.6 L|Sigma 50mm F1.4|Canon 600EX's|Gitzo Explorer Tripod|

  
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2n10
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Oct 15, 2014 10:19 |  #4

timbop wrote in post #17213350 (external link)
definitely NOT a 2x TC; they hurt image quality a lot and unless you have a 1 series or 5d mark 3 then a 2x TC on your 70-200/4 will not auto focus. Kenko or sigma should be about the same

The Kenko Pro TC will focus on a camera as it does not report to the camera. Focus will be spotty and lighting will need to be very good with good contrast. The outside focus points will need to be chosen also as the inner points do not work well with the Kenko TC on.


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johnf3f
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Oct 15, 2014 15:30 |  #5

I have compared the Sigma extenders directly with the Canon Mk2 extenders and I preferred the Canon ones - but not by much!
More importantly I don't think you are going to get much benefit from using extenders on your 70-200 F4. Nothing against your lens but it was never designed for this sort of use and though it will work it won't be at it's best You really need the sharpest (preferably fast) prime lenses to get the benefit of extenders. My 70-200 is the F2.8 IS version and whilst it functions well with extenders the results are not great, if you need more reach it is better to buy a longer lens when funds allow.


Life is for living, cameras are to capture it (one day I will learn how!).

  
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alann
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Oct 17, 2014 08:13 |  #6

RileyNZL wrote in post #17213527 (external link)
If your wanting to use a 2x you might want to look at getting a 70-200 f2.8? Alternately, just by one a tamron/sim 150-600mm for half the price and probably get better IQ and AF speed then using a 2x on another lens.

Also from what I've seen, using the same brand extender as the lens seems to give the best performance (ie sigma extender on a sigma lens), although I don't know where kenko fits into that.

Unless you combine email a Canon X2 I I I with the 70-200 III. Had both and although the Tammy had more reach it was no where as consistently as sharp as the Canon combo. Tammy is a great lens but not the most consistent in IQ


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Tom ­ Reichner
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Oct 17, 2014 09:39 |  #7

alann wrote in post #17217857 (external link)
Unless you combine email a Canon X2 I I I with the 70-200 III.

Could you please explain this statement? I have read it and read it again, and the use/inclusion of the word "email" does not make any sense to me. What is it, exactly, that you mean?


"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".

  
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ShotByTom
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Oct 17, 2014 09:44 |  #8

Not sure about the other brands, but I use a Canon 2x version II with my 6d and 70-200 2.8 IS and is works very well, focus is fine and image quality is excellent.


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FEChariot
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Oct 17, 2014 10:32 |  #9

Tom Reichner wrote in post #17217987 (external link)
Could you please explain this statement? I have read it and read it again, and the use/inclusion of the word "email" does not make any sense to me. What is it, exactly, that you mean?

Yes that's an iPhone autocorrect if I ever saw one. Confused here too.


Canon 7D/350D, Σ17-50/2.8 OS, 18-55IS, 24-105/4 L IS, Σ30/1.4 EX, 50/1.8, C50/1.4, 55-250IS, 60/2.8, 70-200/4 L IS, 85/1.8, 100/2.8 IS L, 135/2 L 580EX II, 430EX II * 2, 270EX II.

  
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bob_r
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Oct 17, 2014 10:55 |  #10

I have Sigma's TCs and they work similar to Canon's. They only fit certain lenses and they do report so you'll lose AF with most cameras when you exceed F/5.6. Here are some 100% crops using a 7D and a 200mm f/2.8L lens - 1.4X first then 2X shot from the same distance.


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Canon 7D, 5D, 35L, 50 f/1.4, 85 f/1.8, 135L, 200L, 10-22, 17-55, 70-300, 100-400L, 500D, 580EX(2).
Sigma 150 macro, 1.4X, 2X, Quantaray 2X, Kenko closeup tubes, Yongnuo YN685(3), Yongnuo YN-622C-TX. Lots of studio stuff.
** Image Editing OK **

  
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alann
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Oct 17, 2014 12:05 |  #11

FEChariot wrote in post #17218071 (external link)
Yes that's an iPhone autocorrect if I ever saw one. Confused here too.

drop the "email and change to 2xIII + 70-200II IQ will be as good as or better than a 100-400. Been doing it for years.


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TC's..........
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