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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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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

Aug 22, 2012 13:54



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Skul
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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)

Aug 22, 2012 17:01



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Maxdave
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See http://photography-on-the.net .../showthread.php?t=1​220466

Aug 23, 2012 10:18 as a reply to Skul's post 17 hours earlier.

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ed ­ rader
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hessleman wrote in post #14892669external 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.

Aug 23, 2012 10:21

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TSchrief
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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.

Aug 23, 2012 11:36

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jhayesvw
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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'S 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
Aug 25, 2012 17:55

Jeremy
7d, 100-400L, 17-55 2.8 IS, Sigma 10-20, 50mm 1.8, 18-55 IS,430 exII
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hollis_f
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TSchrief wrote in post #14896579external 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.

Aug 26, 2012 05:02

Frank Hollis - Retired mass spectroscopist
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TSchrief
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hollis_f wrote in post #14907752external 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.

Aug 26, 2012 06:51

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nightcat
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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.

Aug 26, 2012 07:00



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TSchrief
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hollis_f wrote in post #14907752external link
Er, nope. It gives you a 560mm lens.

TSchrief wrote in post #14907903external 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 #14907927external 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.

Aug 26, 2012 07:05

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hollis_f
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TSchrief wrote in post #14907903external 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.

Aug 26, 2012 07:06

Frank Hollis - Retired mass spectroscopist
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TSchrief
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hollis_f wrote in post #14907939external 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.

Aug 26, 2012 07:08

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modchild
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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.

Aug 26, 2012 07:59

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Maxdave
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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 #14908010external 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.

Aug 27, 2012 10:32

5D3,1D4,S90,GPS-E2,2x580EX,430EX,90EX,​Rokie 8,Siggy 8-16,EF17-40L,Samy SYTS24-C 24TS,EF24-105L IS,EF50 f/1.4,EF85 f/1.8,EF70-200 f/4L IS,EF100-400L IS,Kenko DGX 1.4X,RRS & Pro-Media L-Brackets,Sirui 306/K-20,Giottos MT-7371/MH-3300/VR,Velbon El Carmagne 530,Phottix & Canon Remotes,Lowepro Backpack,ThinkTank Retrospective 20 & Modular System,OpTech straps,Lexar & San Disk Cards

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100 400 canon EF IS lens
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