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Old 22nd of August 2012 (Wed)   #1
hessleman
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Default 100 400 canon EF IS lens

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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Old 22nd of August 2012 (Wed)   #2
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Default Re: 100 400 canon EF IS lens

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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Old 23rd of August 2012 (Thu)   #3
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Default Re: 100 400 canon EF IS lens

See http://photography-on-the.net/forum/....php?t=1220466
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Old 23rd of August 2012 (Thu)   #4
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Default Re: 100 400 canon EF IS lens

Quote:
Originally Posted by hessleman View Post
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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Old 23rd of August 2012 (Thu)   #5
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Default Re: 100 400 canon EF IS lens

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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Old 25th of August 2012 (Sat)   #6
jhayesvw
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Default Re: 100 400 canon EF IS lens

Quote:
Originally Posted by TSchrief View Post
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


phoebe on tumbleweed 560 by jhayesvw, 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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Last edited by jhayesvw : 25th of August 2012 (Sat) at 17:58.
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Old 26th of August 2012 (Sun)   #7
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Default Re: 100 400 canon EF IS lens

Quote:
Originally Posted by TSchrief View Post
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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Old 26th of August 2012 (Sun)   #8
TSchrief
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Default Re: 100 400 canon EF IS lens

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Originally Posted by hollis_f View Post
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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Old 26th of August 2012 (Sun)   #9
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Default Re: 100 400 canon EF IS lens

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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Old 26th of August 2012 (Sun)   #10
TSchrief
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Default Re: 100 400 canon EF IS lens

Quote:
Originally Posted by hollis_f View Post
Er, nope. It gives you a 560mm lens.
Quote:
Originally Posted by TSchrief View Post
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.
Quote:
Originally Posted by nightcat View Post
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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Old 26th of August 2012 (Sun)   #11
hollis_f
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Default Re: 100 400 canon EF IS lens

Quote:
Originally Posted by TSchrief View Post
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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Old 26th of August 2012 (Sun)   #12
TSchrief
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Default Re: 100 400 canon EF IS lens

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Originally Posted by hollis_f View Post
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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Old 26th of August 2012 (Sun)   #13
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Default Re: 100 400 canon EF IS lens

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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Old 27th of August 2012 (Mon)   #14
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Default Re: 100 400 canon EF IS lens

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.

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Quote:
Originally Posted by modchild View Post
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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