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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 17 Feb 2007 (Saturday) 18:38
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Q about Canon EF 1.4x II and Kenko 1.4x Pro 300 converters

 
daletu
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Feb 17, 2007 18:38 |  #1

I am thinking about getting a 1.4x converter for my Canon EF 100-400mm F4.5-5.6L.
It's going to be either Canon 1.4x or Kenko 1.4x Pro 300.
But I have some questions before I decide which one I want to get.

I know AF will not work on both converters unless I use the tape trick.
And I also heard using tape trick on Canon 1.4x converter will have risk of destroying the AF motor.

I don't understand why?
What about Kenko 1.4x?
Will tape trick on Kenko 1.4x have risk too?


Dale
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1D MK III / 5D MK II / 35mm F1.4L / 50mm F1.4 / 85mm F1.2L II / 16-35mm F2.8L II / 24-70mm F2.8L / 70-200mm F2.8L IS / 1.4x II Extender / 580EX ... more

  
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Big ­ WIll
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Feb 17, 2007 18:47 |  #2

Can you explain the Tape trick?

I believe the Kenko gives very good results, the Canon version is slightly better but at a lot more money!

I just bought a Kenko Pro 300 1.4x converter off eBay! So will be posting some shots soon!


Computers blur the boundaries... We are being released from the suddenness of photography, the suddenness of the shutterhttp://www.photography​-on-the.net …p?p=1606920&pos​tcount=132

  
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daletu
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Feb 17, 2007 19:12 as a reply to  @ Big WIll's post |  #3

I read somewhere saying that you cann tape the first 3 pins on the converter to make AF work.

Thanks! I will love to see some shots.


Dale
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1D MK III / 5D MK II / 35mm F1.4L / 50mm F1.4 / 85mm F1.2L II / 16-35mm F2.8L II / 24-70mm F2.8L / 70-200mm F2.8L IS / 1.4x II Extender / 580EX ... more

  
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runninmann
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Feb 17, 2007 19:21 |  #4

In good light, I can achieve AF with the Kenko and the EF 70-300 f/4-5.6 IS at 300 mm.


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jrsforums
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Feb 17, 2007 23:02 |  #5

daletu wrote in post #2726459 (external link)
I am thinking about getting a 1.4x converter for my Canon EF 100-400mm F4.5-5.6L.
It's going to be either Canon 1.4x or Kenko 1.4x Pro 300.
But I have some questions before I decide which one I want to get.

I know AF will not work on both converters unless I use the tape trick.
And I also heard using tape trick on Canon 1.4x converter will have risk of destroying the AF motor.

I don't understand why?
What about Kenko 1.4x?
Will tape trick on Kenko 1.4x have risk too?

Both TC's will act the same way. The Kenko is good, but a bit soft on the edges. The Canon is much sharper all around.

As you look at the end of the TC which attaches to the lens, you will see a row of of 11 pins. These are electrical contacts to transmit info from the lens and the camera. Tape off the 3 left-most pins. I use a small bit of gaffers tape, but any non-residue tape will work.

This will fake the camera into not "seeing" the TC and you will have AF....somewhat slowed, particularly in low light, but it will still work. The 100-400 seems OK with the 1.4x...with 2x it hunts too much.

Actually I do not tape the pins on the TC. On the 100-400 I tape the pins on the lens (mirror image to the TC pins). This way the TC works on the 100-400 "faking" the camera to think it is still max. f/5.6 at 400mm, but will properly report it's (TCs) presence when used with the 70-200 f/2.8.

The "hunting" is what could damage the AF motor...if the person doing it was silly enough to keep trying to use the lens that way...i.e. continually failing to AF properly and "hunting" from end to end.


John

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jrsforums
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Feb 17, 2007 23:07 |  #6

runninmann wrote in post #2726633 (external link)
In good light, I can achieve AF with the Kenko and the EF 70-300 f/4-5.6 IS at 300 mm.

The 70-300f/4-5.6 does not have the extra pins (total 11) to report the presence of a TC, so no TC pin taping is required. The only Canon lenses that due are those which will work with Canon TCs.
http://www.bhphotovide​o.com …ts/canon1_4xExt​ender.html (external link)
(needs to be updated to include '70-200 f/4.0 IS L')


John

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daletu
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Feb 18, 2007 04:54 |  #7

jrsforums wrote in post #2727576 (external link)
Both TC's will act the same way. The Kenko is good, but a bit soft on the edges. The Canon is much sharper all around.

As you look at the end of the TC which attaches to the lens, you will see a row of of 11 pins. These are electrical contacts to transmit info from the lens and the camera. Tape off the 3 left-most pins. I use a small bit of gaffers tape, but any non-residue tape will work.

This will fake the camera into not "seeing" the TC and you will have AF....somewhat slowed, particularly in low light, but it will still work. The 100-400 seems OK with the 1.4x...with 2x it hunts too much.

Actually I do not tape the pins on the TC. On the 100-400 I tape the pins on the lens (mirror image to the TC pins). This way the TC works on the 100-400 "faking" the camera to think it is still max. f/5.6 at 400mm, but will properly report it's (TCs) presence when used with the 70-200 f/2.8.

The "hunting" is what could damage the AF motor...if the person doing it was silly enough to keep trying to use the lens that way...i.e. continually failing to AF properly and "hunting" from end to end.

Thank you very much for your detail explanation.
It makes much more sense now.

So if I tape the pins, I should probably still use manual focus to avoid the lens trying to hunt for the focus point.


Dale
www.daletuphoto.com (external link)
1D MK III / 5D MK II / 35mm F1.4L / 50mm F1.4 / 85mm F1.2L II / 16-35mm F2.8L II / 24-70mm F2.8L / 70-200mm F2.8L IS / 1.4x II Extender / 580EX ... more

  
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Adi7r
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Feb 18, 2007 07:15 |  #8

daletu wrote in post #2726459 (external link)
I am thinking about getting a 1.4x converter for my Canon EF 100-400mm F4.5-5.6L.
It's going to be either Canon 1.4x or Kenko 1.4x Pro 300.
But I have some questions before I decide which one I want to get.

I know AF will not work on both converters unless I use the tape trick.
And I also heard using tape trick on Canon 1.4x converter will have risk of destroying the AF motor.

I don't understand why?
What about Kenko 1.4x?
Will tape trick on Kenko 1.4x have risk too?

Here's a link with the Kenko Pro 300dg attached to a Sigma 50-500mm. Tripod mounted.

https://photography-on-the.net/forum/showthre​ad.php?t=276947
https://photography-on-the.net/forum/showthre​ad.php?t=273768


Adi
flickr (external link)
ephotozine (external link)

  
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SkipD
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Feb 18, 2007 07:27 |  #9

daletu wrote in post #2728573 (external link)
Thank you very much for your detail explanation.
It makes much more sense now.

So if I tape the pins, I should probably still use manual focus to avoid the lens trying to hunt for the focus point.

Just don't tape the pins, and use manual focus. If you're going to use manual focus anyway, there's no reason to risk buggering up the connectors with adhesive.


Skip Douglas
A few cameras and over 50 years behind them .....
..... but still learning all the time.

  
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Q about Canon EF 1.4x II and Kenko 1.4x Pro 300 converters
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