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FORUMS Photography Talk by Genre Bird Talk 
Thread started 30 Jan 2012 (Monday) 15:37
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Kenko pro 300 1.4 on a 7D with 100-400mm

 
ttownvstrom
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Jan 30, 2012 15:37 |  #1

I bought a Kenko pro 1.4 TC to use on my 100-400mm on my 7D because its supposed to auto focus. It does, just not very well. I was out on a clear sunny day and the shots that I got it to work on were great, very sharp. I take bird shots and a majority of the time it would hunt badly and not focus. At one time I was trying to take photos of waterfowl on a pond and it would not focus no matter what. I'm was very happy with the results when it worked but I can't shoot birds fighting it like that. I was using single shot and spot focus, should I have used some other settings or should I make someone a good deal on a slightly used TC.


Canon 7D2, Canon 100-400mmV2, Tamron 60mm macro, Tamron 10-24mm and Canon 400mm 5.6

  
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troyhattemer
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Jan 30, 2012 15:41 |  #2

I use that same TC on my 7D and the 400mm f5.6. I couldn't get the center point to work very good but the outer points work extremely well and focus really fast.




  
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ttownvstrom
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Jan 30, 2012 15:45 as a reply to  @ troyhattemer's post |  #3

Thats interesting.


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Grizz
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Jan 30, 2012 15:57 |  #4

I have an older Kenko Pro 1.4 DG. It works fine with my 60D and my 400 5.6, center point focus.

I had a 100-400 and this same Tele would work hit and miss with that lens.

Go figure.


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No ­ Angle
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Jan 30, 2012 17:41 |  #5

If that is the case I may have to grab one for my 400. I want more reach.

troyhattemer wrote in post #13795903 (external link)
I use that same TC on my 7D and the 400mm f5.6. I couldn't get the center point to work very good but the outer points work extremely well and focus really fast.


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2slo
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Jan 31, 2012 13:52 as a reply to  @ No Angle's post |  #6

A possibility which occurs to me here is that the 100-400 is IS which, when IS is switched on, will affect AF speed. Possibly using a TC will cause a further increase in time for AF to lock. I find this when using the TC on my 300mm f/4, best to use it without IS on for faster AF. Similarly the comment above about the quick AF when using the 400 f/5.6. That lens doesn't have IS. Could be all or part of the issue I think.




  
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Grizz
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Jan 31, 2012 23:21 |  #7

I would agree with Mark. It might have to do with IS on the 100-400.


Craig * Canon 7D Mark II * 60D * 10D * Tamron SP 150-600 f/5-6.3 Di VC USD * EF 400 5.6L USM * EF 17-40 4.0L USM * EF 70-210 4.0 * EF 28 2.8 * EF 50 1.8 MK1*Flickr (external link)

  
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ttownvstrom
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Feb 01, 2012 09:04 as a reply to  @ Grizz's post |  #8

I'll try it this weekend with the IS off.


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jhayesvw
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Feb 11, 2012 21:06 as a reply to  @ ttownvstrom's post |  #9

I have a 60d with 100-400 and a kenko 1.4 mc4. It focuses but not fast.



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nordlysBW
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Feb 12, 2012 04:33 as a reply to  @ jhayesvw's post |  #10

I also find it dead slow with IS on, but then again Ithink another factor that explains the to-and-fro AF hesitation is low contrast between the main subject and background.

I tried that yesterday with a far from picture filling goldeneye swimming in an ice-free river pool bathed in the golden brownish evening light and the AF took its time. So it was hit-and-miss to get the duck at all before it would dive for food again.




  
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mek501st
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Feb 15, 2012 04:52 as a reply to  @ nordlysBW's post |  #11

I found mine to work wonderfully .... I have lots of shots with this combination. However, I use the tripod and keep the IS off


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hollis_f
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Feb 15, 2012 06:10 |  #12

mek501st wrote in post #13900886 (external link)
I found mine to work wonderfully .... I have lots of shots with this combination. However, I use the tripod and keep the IS off

You need to update your gear list as neither the 7D nor the 100-400 are mentioned.


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Muteki
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Feb 15, 2012 13:29 |  #13

troyhattemer wrote in post #13795903 (external link)
I use that same TC on my 7D and the 400mm f5.6. I couldn't get the center point to work very good but the outer points work extremely well and focus really fast.

I have the same setup, no pin-taping. Same center point problem. However, I find the focus to be quite slow, especially for BIF, and hunts a lot. Any particular setting you use?


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No ­ Angle
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Feb 15, 2012 17:49 |  #14

I tried a DGX Pro 300 1.4 today and AF works sort of but the light was poor today with the rain. I had it on center point. I do not think it will work with BIF though.


7D / 70-200 F4L IS / 400 5.6L / 50mm 1.8 / 18-55 Kit / CS5 plus other software.
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ttownvstrom
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Feb 16, 2012 16:44 as a reply to  @ No Angle's post |  #15

I tried it on one of the outer focus points with the IS on this weekend and it focused fast and just about everytime. It was very cloudy and I was takeing shots of a Common Goldeneye that was swimming very fast and all the shots were pretty soft. Maybe this weekend I'll have some sunlight and see if I can get decent IQ then.


Canon 7D2, Canon 100-400mmV2, Tamron 60mm macro, Tamron 10-24mm and Canon 400mm 5.6

  
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Kenko pro 300 1.4 on a 7D with 100-400mm
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