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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
Hatchling
8 posts
Joined Aug 2012
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
Member
92 posts
Joined Oct 2011
SE Texas
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=1​220466


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ed ­ rader
"I am not the final word"
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Joined May 2005
silicon valley
Aug 23, 2012 10:21 |  #4

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.


http://instagram.com/e​draderphotography/ (external link)
5D3, 7d, 16-35L f4 IS, 24-70L II, 70-300L, 100-400L II, 14L II, 15mm FE (sigma), gitzo, markins, benro

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TSchrief
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Aug 23, 2012 11:36 |  #5
banned

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
Cream of the Crop
Joined Jan 2011
Tucson AZ
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'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

Jeremy
7d, 100-400L, 17-55 2.8 IS, Sigma 10-20, 50mm 1.8, 18-55 IS,430 exII
My Flickrexternal link

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hollis_f
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Aug 26, 2012 05:02 |  #7

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.


Frank Hollis - Retired mass spectroscopist
Give a man a fish and he'll eat for a day. Teach a man to fish and he'll complain about the withdrawal of his free fish entitlement.
Gear Websiteexternal link

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TSchrief
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Aug 26, 2012 06:51 |  #8
banned

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.


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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 #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.


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hollis_f
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Aug 26, 2012 07:06 |  #11

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.


Frank Hollis - Retired mass spectroscopist
Give a man a fish and he'll eat for a day. Teach a man to fish and he'll complain about the withdrawal of his free fish entitlement.
Gear Websiteexternal link

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TSchrief
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Aug 26, 2012 07:08 |  #12
banned

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.


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modchild
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Lincoln, Uk
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.


EOS 5D MkIII, EOS 70D, EOS 650D, EOS M, Canon 24-70 f2.8L MkII, Canon 70-200 f2.8L IS MkII, Canon 100 f2.8L Macro, Canon 17-40 f4L IS, Canon 24-105 f4L IS, Canon 300 f4L IS, Canon 85 f1.8, Canon 50 f1.4, Canon 40 f2.8 STM, Canon 35 f2, Sigma 150-500 OS, Tamron 18-270 PZD, Tamron 28-300 VC, 580EX II Flash, Nissin Di866 MkII Flash, Sigma EM 140 Macro Flash and other bits.

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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 #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.


5D3,1D4,S90,iPhone 6,GoPro Hero 4 Silver,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,EF300 f/4L IS,EF100-400L I IS,Kenko DGX 1.4X,RRS&Pro-Media L-Brackets,Manfrotto MHXPRO-3WG,Sirui 306&K-20,Giottos MT-7371&MH-3300,Velbon ElCarmagne 530,Phottix&Canon Remotes,Manfrotto Roller 50,Lowepro Backpack,ThinkTank Retro 20&Modular System,OpTech straps,Lexar/San Disk Cards

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100 400 canon EF IS lens
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