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Thread started 06 Feb 2018 (Tuesday) 14:13
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Canon Extender II

 
John ­ Sheehy
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Feb 08, 2018 14:42 |  #16

00derek wrote in post #18559418 (external link)
I don't own any extenders but I was considering the Canon 2X (II or III) - I had heard tales of it losing AF and wanted some advice. In a previous post on POTN I was told it loses AF at 400mm, but I can see from the discussion here that it's about the aperture not the focal length. A TC may work better at the minimum zoom than maximum, but I'm sure no one bolts on a TC to shoot at 200mm with a 100-400 zoom.

My body is a Canon 5D mk IV.

Sounds like 1.4X III is the one I should be looking into.

Thank you all.

That's a good first step. You might be more inclined to use it than a 2x. A 2x needs a faster lens to AF well (if at all), and if you want AF, a 1.4x will work with more equipment and circumstances.




  
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cristphoto
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Feb 08, 2018 16:15 as a reply to  @ post 18559418 |  #17

On my 5D4 if I use the 100-400 with the 1.4 extender (ver2) I have 9 focus points still available. When I use the same lens combination on my 5D3 or 1D4 I only have the center focus point available. If at all possible I would stay clear of the 2x converters. First because you lose af on most (not all) lenses. Second image quality drops off much more than when using the 1.4 tc's. Hope this helps.


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CyberDyneSystems
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Post edited 6 months ago by CyberDyneSystems. (2 edits in all)
     
Feb 08, 2018 16:46 |  #18

With the 5D4, you will get usable AF with either the 1.4XII or III
You will not get any AF with the either 2X.

If you use the 1.4XII you will get a small group of 9 usable AF points in the center. If you use the 1.4X III you get all AF points :)

With the latest lens and body, like you have, it really will be worthwhile going for the version III.


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00derek
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Feb 09, 2018 18:18 as a reply to  @ CyberDyneSystems's post |  #19

ordering the 1.4x III in 3,2,1....




  
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Snydremark
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Feb 09, 2018 19:52 |  #20

00derek wrote in post #18559418 (external link)
I don't own any extenders but I was considering the Canon 2X (II or III) - I had heard tales of it losing AF and wanted some advice. In a previous post on POTN I was told it loses AF at 400mm, but I can see from the discussion here that it's about the aperture not the focal length. A TC may work better at the minimum zoom than maximum, but I'm sure no one bolts on a TC to shoot at 200mm with a 100-400 zoom.

My body is a Canon 5D mk IV.

Sounds like 1.4X III is the one I should be looking into.

Thank you all.

Correct; if you want AF w/ the TC, you need a 1.4. For best results, the MkIII is your target. I use the Mk III 1.4 w/ the newer 100-400 on occasion, w/ the 7DII and it works relatively well. I don't bother with flying things as it's too slow even then, but it works ok for stationary or slower moving, ground targets.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
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TeamSpeed
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Feb 09, 2018 20:28 |  #21

Bassat wrote in post #18558990 (external link)
I mean that it is way too slow to be of any use for moving targets, and way too inaccurate to use for stationary targets. As in: may as well not have it. It tries, it even locks and beeps, but the targets are not in focus. As in: it doesn't work.

The Kenko 1.4x worked pretty well with the 100-400L when I had that lens. I would often run the 1.4x at the zoo on the lens, and on a nice day, it did well, AF locked on, etc. All with the older bodies too, because either I taped the 3 reporting pins, or the TC didn't report, I don't remember which.


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apersson850
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May 18, 2018 16:31 |  #22

Sorry if I was unclear. What I meant is that the AF characteristics is determined by the smallest maximum aperture a lens has. So an f/4-5.6 lens will be an f/5.6 lens from an AF point of view, regardless of which zoom setting you currently have.
It's a common misunderstanding that it's the ability to allow brighter light to hit the AF sensor that's the reason for an f/2 lens having higher precision AF than an f/5.6 lens. But it's not. You can go out in the blinding sun with an f/11 lens, and get more light on the AF sensor than with an f/1.4 in dim light. But the f/1.4 lens will allow high precision AF anyway, whilst the f/11 lens (like an f/5.6 + 2X extender) will not AF at all, in spite of the illumination being brighter on the AF sensor with the f/11 lens.

Higher precision AF is accomplished by AF sensors with the left and right part further apart. For that to work in the secondary image forming lens system above the AF sensor, the light rays entering that optics must be far enough apart in the lens. If the aperture is too small, that's not possible, regardless of how bright the light is.

The AF system usually has its own aperture, which will make all lenses larger than f/2.8 to still be no more than f/2.8. The light rays far apart in an f/1.2 lens are frequently not accurate enough to make AF better, so its better to cut them away and avoid having them distort the result.


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RPCrowe
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Jun 09, 2018 17:52 |  #23

I think that this has been answered above but, let me give you my take:

First of, I never shoot with the 2x TC. I have heard that it produced acceptable results with the 70-200mm f/2.8L IS II lens but, I don't use that lens...

I have the 70-200mm f/4L IS lens and have previously used the 1.4x Mark-I TC on that lens (as well as on the 300mm f/4L IS) on a 7D Mark-I camera. I now have a 7D Mark-2 and a 6D Mark-2 as well as a 1.4x Mark-III TC which works very well with the 100-400mm f/4.5-5.6L IS II lens on both cameras.

I no longer use a TC on my 70-200mm lens since I can easily switch to the 100-400mm which will give me better results and a wider focal range tan the 70-200mm lens with a 1.4x TC.


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