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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 22 Aug 2012 (Wednesday) 13:54
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100 400 canon EF IS lens

 
hessleman
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Aug 22, 2012 13:54 |  #1

Could anyone advise me on any third party 1.4 tele convertor i can use on a canon 7D and 100 400 EF lens and still have auto focus. Thanks




  
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Skul
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Aug 22, 2012 17:01 |  #2

Sorry, I don't know of any.
If you use the "tape trick", it will AF to a point.
Re-set to center point AF.
It's slow and tends to hunt, even in bright light.
(at least my 5D, does)




  
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Maxdave
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Aug 23, 2012 10:18 as a reply to  @ Skul's post |  #3

See http://photography-on-the.net …/showthread.php​?t=1220466


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ed ­ rader
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Aug 23, 2012 10:21 |  #4

hessleman wrote in post #14892669 (external link)
Could anyone advise me on any third party 1.4 tele convertor i can use on a canon 7D and 100 400 EF lens and still have auto focus. Thanks

even on a 1d body the 100-400 + 1.4 TC focusses painfully slow and with only center point and the IQ is suckish.


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TSchrief
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Aug 23, 2012 11:36 |  #5
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Using a 1.4X at 400mm with an APS-c body gives you a 900mm f/8 lens. The IS will be useless and God himself couldn't hand-hold that combination. Get a really nice tripod.


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jhayesvw
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Aug 25, 2012 17:55 |  #6

TSchrief wrote in post #14896579 (external link)
Using a 1.4X at 400mm with an APS-c body gives you a 900mm f/8 lens. The IS will be useless and God himself couldn't hand-hold that combination. Get a really nice tripod.

shot handheld with my 60d 100-400L and Kenko 1.4 TC with auto focus

IMAGE: http://farm8.staticflickr.com/7030/6820521781_099a8c6342_b.jpg
IMAGE LINK: http://www.flickr.com/​photos/jhayesvw/682052​1781/  (external link)
phoebe on tumbleweed 560 (external link) by jhayesvw (external link), on Flickr

This is the cheap $129 kenko that can be purchased at B&H.
I have heard the pro 300 is even better.

honestly though I think cropping the 400 gave the same or slightly better results without a hit in AF


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hollis_f
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Aug 26, 2012 05:02 |  #7

TSchrief wrote in post #14896579 (external link)
Using a 1.4X at 400mm with an APS-c body gives you a 900mm f/8 lens.

Er, nope. It gives you a 560mm lens.


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TSchrief
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Aug 26, 2012 06:51 |  #8
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hollis_f wrote in post #14907752 (external link)
Er, nope. It gives you a 560mm lens.

Mr. Hollis, here is my calculation:
400 X 1.4 (for the TC) X 1.6 (for APS-c) = 896 (35mm/FF equivalent).

OP stated he is using a 7D. Am I not thinking properly? I will admit, it has happened before.
Thanks.


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nightcat
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Aug 26, 2012 07:00 |  #9

When using a crop camera, the 1.6 factor is understood and not figured in the math when discussing an extender. The general thinking would agree with Hollis that the 1.4 will give you a 560mm lens. Thinking to the contrary creates confusion.




  
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TSchrief
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Aug 26, 2012 07:05 |  #10
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hollis_f wrote in post #14907752 (external link)
Er, nope. It gives you a 560mm lens.

TSchrief wrote in post #14907903 (external link)
Mr. Hollis, here is my calculation:
400 X 1.4 (for the TC) X 1.6 (for APS-c) = 896 (35mm/FF equivalent).

OP stated he is using a 7D. Am I not thinking properly? I will admit, it has happened before.
Thanks.

nightcat wrote in post #14907927 (external link)
When using a crop camera, the 1.6 factor is understood and not figured in the math when discussing an extender. The general thinking would agree with Hollis that the 1.4 will give you a 560mm lens. Thinking to the contrary creates confusion.

Ok. Thanks for the correction and for the explanation. I will remember that.


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hollis_f
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Aug 26, 2012 07:06 |  #11

TSchrief wrote in post #14907903 (external link)
Mr. Hollis, here is my calculation:
400 X 1.4 (for the TC) X 1.6 (for APS-c) = 896 (35mm/FF equivalent).

OP stated he is using a 7D. Am I not thinking properly? I will admit, it has happened before.
Thanks.

Using a crop sensor does not change the focal length of a lens.


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TSchrief
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Aug 26, 2012 07:08 |  #12
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hollis_f wrote in post #14907939 (external link)
Using a crop sensor does not change the focal length of a lens.

Yes sir. I am aware of that. I just made the mistake of using both TC and crop-factor in my calculation. Thanks for setting me straight.


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modchild
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Aug 26, 2012 07:59 |  #13

It wont change the focal length of the lens, but it will change the equivalent field of view to an approximate 900mm. Anyhow, if you use a Kenko Pro300 DGX 1.4x TC you can still AF a 100-400 on a 7D body. It's not quite as fast and it does suffer when the light fails, but you should get decent speed and accuracy with it. I had the same combo running on a 5D2, T2i (550D), 60D as well as the 7D for weeks before I sold the 100-400 and got some really good photos handheld. With the Kenko Pro300 DGX you don't have to tape any contacts and it reports the aperture and distance correctly too.


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Maxdave
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Aug 27, 2012 10:32 |  #14

Confirmed in field for me too ... IS and AF retained at all focal lengths on both 7D and 5DM2 with Kenko 1.4X Pro 300 DGX. This is NOT the case with the prior Kenko 1.4X Pro 300 DG.

Maxdave

modchild wrote in post #14908010 (external link)
It wont change the focal length of the lens, but it will change the equivalent field of view to an approximate 900mm. Anyhow, if you use a Kenko Pro300 DGX 1.4x TC you can still AF a 100-400 on a 7D body. It's not quite as fast and it does suffer when the light fails, but you should get decent speed and accuracy with it. I had the same combo running on a 5D2, T2i (550D), 60D as well as the 7D for weeks before I sold the 100-400 and got some really good photos handheld. With the Kenko Pro300 DGX you don't have to tape any contacts and it reports the aperture and distance correctly too.


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100 400 canon EF IS lens
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