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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 04 Aug 2012 (Saturday) 10:42
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EF 100-400 and Canon Extenders

 
moltengold
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Aug 04, 2012 10:42 |  #1

Can anyone tell me plz
is the canon extender x1.4 work fine auto focus with this lens on the 7D ?
or it will be manual focus ?
i want to know before buying this extender
Thanks


| Canon EOS | and some canon lenses

  
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jmcgee131
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Aug 04, 2012 10:48 |  #2

It should be manual only, on the long end. I believe only the 1D series is capable of AF on f8 which is the f-stop you would be with the 100400 + 1.4 TC. I have read that some of the sigma TC will allow AF in bright conditions, but not reliably.


Feed back #1#2
Learning to read light one click at a time.

  
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moltengold
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Aug 04, 2012 11:05 |  #3

Thanks a lot


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inernets
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Aug 04, 2012 11:37 as a reply to  @ moltengold's post |  #4

you can use the tape trick to gain auto focus. You can read more from the link below, there is also a link to a website (bottom of post) that shows you how to do it.

http://www.flickr.com/​photos/ehambrick/59603​89495/ (external link)

If you plan on using the 1.4x III extender on this lens i suggest you lower your expectations. Auto focus does NOT work unless you do the "Tape trick" which you tape 3 pins on the lens that attaches to the body, which tricks the camera into thinking there is not extender on and you can use the center focus only.

<b>You HAVE to use this setup on sunny days</b>. The photo above was pushing it, late in the day, but i was able to auto focus with that light. Auto focus is SLOW and very annoying. It may take 5 to 10 seconds to lock on, so if you are doing wildlife it can easily make you miss shots.. with that being said i was able to get some awesome action shots and wildlife shots with the extender and tape trick. For example, you can see below a Great Blue Heron fishing while a Cormorant drifts by. In great light you will be able to focus quickly, only noticing a slight delay.

<b>So with the 1.4x extender on my full frame body and the 100-400mm</b>, that gives me 140-560mm. It is long enough to hand held without too much lose of quality. If you were shooting on a cropped camera like a 7D or my back up, a 40D, i have seen people report problems with the photos being blurry while hand held...

IMAGE: http://farm7.staticflickr.com/6150/5960389495_07b772cf07_z.jpg
IMAGE LINK: http://www.flickr.com/​photos/ehambrick/59603​89495/  (external link)
Canon 100-400mm L + 1.4x III Extender - 100 vs 400 (external link) by Evan Animals (external link), on Flickr


Here is a link to the tape trick:
http://www.michaelfurt​man.com/taping_the_pin​s.htm (external link)

I have used the 5D II + tape trick on extender + 100-400mm with some great results. You need a lot of light for the auto focus to work well. You can read the flickr review above for more info on that. If you do do the tape trick, be careful because if you keep your lens in a very hot place for long periods of time (like your car on hot summer days) the tape can stick to your lens mount and it can be difficult to remove. If this happens you will have to clean the contact points where the tape was, no big deal. If you want i can show pictures of 100-400mm with extender

1D III - 1D II - 5D II - 50D - 40D - EOS M.
16-35mm, 24-105mm, 100-400mm, 40mm 2.8, 50mm 1.4, 85mm 1.8, 135mm 2.0 . 1.4x III, 2x III. 270ex, 270exII, 430ex, 600ex

  
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moltengold
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Aug 04, 2012 15:25 |  #5

Thanks internets
for all the info


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wayne.robbins
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Aug 04, 2012 21:22 |  #6

I don't have a 100-400L. While using a 1.4x TC with it should make AF not work- and you might be able to pull off autofocus with the tape trick- there are other tricks that can help.
1. You can pre-focus- get it in the neighborhood.
2. If you have a focus limiter ( Don't have a 100-400L- so I don't know if it does )- use it.
3. Use live-view. You probably won't need the tape trick to do this. Pre-focusing might help. A focus limiter- if you got one- helps.


EOS 5D III, EOS 7D,EOS Rebel T4i, Canon 70-200 f/2.8 IS II, Canon 24-105L, Canon 18-135 IS STM, 1.4x TC III, 2.0x TC III, Σ 50mm f/1.4, Σ 17-50 OS, Σ 70-200 OS, Σ 50-500 OS, Σ 1.4x TC, Σ 2.0x TC, 580EXII(3), Canon SX-40, Canon S100
Fond memories: Rebel T1i, Canon 18-55 IS, Canon 55-250 IS, 18-135 IS (Given to a good home)...

  
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1Tanker
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Aug 04, 2012 21:40 as a reply to  @ wayne.robbins's post |  #7

It blows my mind, how many people are too lazy too search anything. Although the search on this site is pretty lame, there are 100's of threads regarding this, filters, 50/1.8 vs 50/1.4, 24-105 vs. 24-70, etc. etc.


Kel
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Skul
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Aug 05, 2012 07:28 |  #8

I, also use the tape trick with a 5D Mkll. It works, and as mentioned by others, slow.
In even slightly shaded conditions, it can be very iffy to no worky.:D




  
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Lowner
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Aug 05, 2012 09:02 |  #9

Same here, the tape trick does the business. I don't find it slow in shady conditions, it just keeps going.


Richard

http://rcb4344.zenfoli​o.com (external link)

  
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modchild
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Aug 05, 2012 16:30 |  #10

I've used my Kenko Pro300 DGX 1.4x converter on a Canon 100-400 L and retained AF on my 550D, 60D, 7D, 5D2 and 5D3. The DGX version doesn't need any pins taping and it reports correctly in the EXIF too. It slowed down the AF very slightly and it AF'd in all but dull light and there was negligable loss in IQ 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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gocolts
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Aug 05, 2012 21:20 |  #11

modchild wrote in post #14818085 (external link)
I've used my Kenko Pro300 DGX 1.4x converter on a Canon 100-400 L and retained AF on my 550D, 60D, 7D, 5D2 and 5D3. The DGX version doesn't need any pins taping and it reports correctly in the EXIF too. It slowed down the AF very slightly and it AF'd in all but dull light and there was negligable loss in IQ too.

Good to hear- yours is one of the most positive reports on this. My Canon 400mm f/5.6L was pretty good with that Kenko TC, I am hesitant to push my luck on a 100-400L, but it sounds like I should maybe give it a shot with my 7D.




  
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EF 100-400 and Canon Extenders
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