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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 17 Apr 2011 (Sunday) 23:26
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100-400 w/extender won't work

 
olcoach
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Apr 17, 2011 23:26 |  #1

Hi, When I put a 1.4 or 2.0 extender on my canon 100-400 lens the lens motor doesn't work. The motor works on the lens when the extenders aren't on and the motor works on other lenses when the extenders are on but not on the 100-400. Anybody have any ideas? Thanks, Mike




  
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Apr 17, 2011 23:27 |  #2

What camera? And what TC?


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YouTellMe
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Apr 17, 2011 23:33 |  #3

sounds like its refusing to AF because its not a 1series body due to the aperature raised.


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Apr 17, 2011 23:39 as a reply to  @ post 12242957 |  #4

Manual focus...and have fun! ;)


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K6AZ
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Apr 18, 2011 00:15 |  #5

1Tanker wrote in post #12242978 (external link)
Manual focus...and have fun! ;)

Heck with that... time for a 1D body, the IIn is pretty cheap now. ;)


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argyle
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Apr 18, 2011 06:39 as a reply to  @ K6AZ's post |  #6

Tape the pins on the TC...the AF will then work. There are threads that explain which pins need to be taped, you can also google it. I use the Kenko Pro 300 DG 1.4 with my 100-400 and it works fine with the pins taped...it may hunt in low light, but with good light no problem (may not be ideal for BIF or sports, but for some subject matter its adequate).


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Apr 18, 2011 06:50 |  #7

Have a look here
http://www.michaelfurt​man.com/taping_the_pin​s.htm (external link)
It will AF with a 1.4,mine does with a Kenko ,cant speak for Canon but as argyle says it is slow and it needs lots of light.
Its f8 with a 1.4 and f11 with a 2*.
It wont work even with the pins taped on a 2*


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K6AZ
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Apr 18, 2011 12:05 |  #8

argyle wrote in post #12244117 (external link)
Tape the pins on the TC...the AF will then work. There are threads that explain which pins need to be taped, you can also google it. I use the Kenko Pro 300 DG 1.4 with my 100-400 and it works fine with the pins taped...it may hunt in low light, but with good light no problem (may not be ideal for BIF or sports, but for some subject matter its adequate).

Even with a 1D and the EF 1.4x II BIF are hit or miss. TCs on the 100-400 do fine on slow or non-moving subjects but you really need an f/4 or faster lens to shoot action without having to roundfile most of the shots.


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Apr 18, 2011 12:15 |  #9

During my trip to Australia from 19 Feb - 30 Mar, I had a Canon 100-400mm and for the days when I used that lens on my T2i, I was in manual focus mode anyway, just for the sake of ensuring I got what I wanted and not something that happened across the FOV during open aperture.

:)

1D body would be good idea though (hmmm...I feel money flying out of my pocket already).


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troutfisher
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Apr 18, 2011 12:16 |  #10

K6AZ wrote in post #12245849 (external link)
Even with a 1D and the EF 1.4x II BIF are hit or miss. TCs on the 100-400 do fine on slow or non-moving subjects but you really need an f/4 or faster lens to shoot action without having to roundfile most of the shots.

Thanks for that , I was considering a 1d11n so it would AF for BIF with this combo but I wont bother now


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K6AZ
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Apr 18, 2011 12:21 |  #11

troutfisher wrote in post #12245917 (external link)
Thanks for that , I was considering a 1d11n so it would AF for BIF with this combo but I wont bother now

I would really suggest an f/4 lens for BIF or action. I took the 100-400 with me on a trip to CA a few months ago and it did fine for a lot of things but BIF were a real disappointment. When I use the 70-200 f/4 IS with the TC I can nail BIF easily.


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olcoach
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Apr 18, 2011 21:15 as a reply to  @ K6AZ's post |  #12

Hi, The camera I am using is a 40D and the extender(s) are both Canon. All I've found indicates it should work but... Thanks for all your help. Mike




  
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Apr 18, 2011 21:17 |  #13

olcoach wrote in post #12249275 (external link)
Hi, The camera I am using is a 40D and the extender(s) are both Canon. All I've found indicates it should work but... Thanks for all your help. Mike

AF won't work on that body with f/5.6 or slower lenses without taping the pins. You need to either tape the pins or use a f/4 or faster lens for AF functionality.


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monty28428
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Apr 18, 2011 21:21 |  #14

No they wont work unless you tape the pins. 40D will not AF at f/8.

I've had good luck taping the pins on a 1.4x in good light on the 100-400.




  
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100-400 w/extender won't work
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