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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 10 Jul 2013 (Wednesday) 17:29
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2X III on a 70-200 2.8 II

 
scpictaker
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Jul 10, 2013 17:29 |  #1

Does this combo work, the 2X III extender on the 70-200 2.8 II L ? thinking of buying an extender and wondering if the AF will still function. Thanks


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Invertalon
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Jul 10, 2013 17:44 |  #2

Yes it does... It does slow it down, but completely usable for the most part for static shooting. It is OK for servo, but accuracy is quite a bit lower with the 2x III. IQ remains really good, however, stopping it down to f/6.3 or f/7.1 sharpens it up quite a bit from f/5.6.


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TheLensGuy
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Jul 10, 2013 18:20 |  #3
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It focuses extremely slow and it also does hunt focus a lot back and forth. Lastly, you really need to step it down to at least 7.1 for acceptable sharpness. Wide open at 5.6, it's really not great.




  
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richi914
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Jul 10, 2013 19:02 |  #4

some examples


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scpictaker
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Jul 10, 2013 20:01 |  #5

Thanks for the info!


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Invertalon
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Jul 10, 2013 20:10 |  #6

TheLensGuy wrote in post #16109022 (external link)
It focuses extremely slow and it also does hunt focus a lot back and forth. Lastly, you really need to step it down to at least 7.1 for acceptable sharpness. Wide open at 5.6, it's really not great.

Extremely slow?

I thought it was quite snappy to be honest. Not bare-lens fast, but not 85L slow, either. As long as not going from MFD to infinity, it was extremely quick on the 5D3.

IQ wide open is a bit soft, but a slight stop down improved it quite a bit and extremely sharp at f/7.1.


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TheLensGuy
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Jul 10, 2013 20:47 |  #7
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Invertalon wrote in post #16109339 (external link)
Extremely slow?

I thought it was quite snappy to be honest. Not bare-lens fast, but not 85L slow, either. As long as not going from MFD to infinity, it was extremely quick on the 5D3.

IQ wide open is a bit soft, but a slight stop down improved it quite a bit and extremely sharp at f/7.1.

85L is a portrait lens. 2x TC on a 70-200 is a bird/reach/etc lens, totally different beasts. The AF speed for me using the 2x with the zoom was useless. It is just way too slow to track anything moving, planes, helicopters, cars, it's just not easy to use.

In terms of the sharpness, I have 200L along with 70-200 IS II, and the two does not even compare with the TC. If this is acceptable to you, then I guess that's what matters:

http://imageshack.us/a​/img823/9374/1or7.jpg (external link)

vs

http://imageshack.us/a​/img507/5010/6w3b.jpg (external link)

These were both shot at 7.1 I believe.




  
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kin2son
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Jul 10, 2013 20:56 |  #8
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TheLensGuy wrote in post #16109417 (external link)
85L is a portrait lens. 2x TC on a 70-200 is a bird/reach/etc lens, totally different beasts. The AF speed for me using the 2x with the zoom was useless. It is just way too slow to track anything moving, planes, helicopters, cars, it's just not easy to use.

lol seriously? Those are easy to track with the combo. Bad technique?

Granted when I try to catch little Bifs such as winter swallow it was extremely difficult, frustrated tbh, but cars, planes and such is easy as, as long as you weren't talking about F1 cars going at 250km/h, or Fighter jets in mid air :p


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TheLensGuy
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Jul 10, 2013 21:21 |  #9
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kin2son wrote in post #16109445 (external link)
lol seriously? Those are easy to track with the combo. Bad technique?

Granted when I try to catch little Bifs such as winter swallow it was extremely difficult, frustrated tbh, but cars, planes and such is easy as, as long as you weren't talking about F1 cars going at 250km/h, or Fighter jets in mid air :p

Yes, I have bad technique, I also don't know much about photography let alone focusing on moving objects. Who needs a 6k glass when you get can a 2k one and attach a $400 converter to it, because it focuses fast enough.




  
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gabebalazs
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Jul 10, 2013 21:58 |  #10

I "only" have a Sigma 70-200 2.8 OS and a Sigma 2x APO EX DG tc and I think the AF speed is still very good. Of course here I'm not talking about twilight conditions.
But I sometimes use this combo coupled with my 7D (or T4i) for some wildlife shots (whenever I don't feel like lugging my 120-300 2.8 OS around).
I've never really had any problems with its AF speed, and even do some BIF occasionally.

I would assume the Canon 70-200 II and 2x III would be at least as good, probably better.


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scpictaker
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Jul 10, 2013 22:14 as a reply to  @ gabebalazs's post |  #11

All I would use it for is for the Loons and the Bald Eagles at our lake.


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Canon 5D MKIII l 7D MKII l 24-105L l 16-35 L II l Sigma 50 1.4 ART l 70-200 2.8 L II l 24-70L l EOS M l 2X III l Rok 14mm

  
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Jul 10, 2013 22:21 |  #12

My 2X III slows down AF from MFD to infinity when used on my 70-200L II and my 200L II. TLG, are you saying that on your 200L IS, the drop in AF speed is not so severe?




  
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Rallynut
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Jul 10, 2013 23:12 as a reply to  @ scpictaker's post |  #13

I used this combo a couple of times for air shows. The focus is slower but the real problem is carrying it around all day!


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Trevor
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Tapeman
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Jul 10, 2013 23:26 |  #14

I think the combo is very usable. Are there better ways to get to 400mm? Sure. If you are going to shoot at 400mm all the time get a 400mm prime. If you are going to carry the 70-200 and want to get to 400mm occasionally, get the converter.


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scpictaker
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Jul 10, 2013 23:26 |  #15

That looks good!


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2X III on a 70-200 2.8 II
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