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Old 30th of January 2012 (Mon)   #1
ttownvstrom
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Default Kenko pro 300 1.4 on a 7D with 100-400mm

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.
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Old 30th of January 2012 (Mon)   #2
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

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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Old 30th of January 2012 (Mon)   #3
ttownvstrom
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

Thats interesting.
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Old 30th of January 2012 (Mon)   #4
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

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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Old 30th of January 2012 (Mon)   #5
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

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

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Originally Posted by troyhattemer View Post
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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Old 31st of January 2012 (Tue)   #6
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

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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Old 31st of January 2012 (Tue)   #7
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

I would agree with Mark. It might have to do with IS on the 100-400.
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Old 1st of February 2012 (Wed)   #8
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

I'll try it this weekend with the IS off.
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Old 11th of February 2012 (Sat)   #9
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

I have a 60d with 100-400 and a kenko 1.4 mc4. It focuses but not fast.
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Old 12th of February 2012 (Sun)   #10
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

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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Old 15th of February 2012 (Wed)   #11
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

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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Old 15th of February 2012 (Wed)   #12
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

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Originally Posted by mek501st View Post
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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Old 15th of February 2012 (Wed)   #13
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

Quote:
Originally Posted by troyhattemer View Post
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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Old 15th of February 2012 (Wed)   #14
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

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.
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Old 16th of February 2012 (Thu)   #15
ttownvstrom
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Default Re: Kenko pro 300 1.4 on a 7D with 100-400mm

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.
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