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Archive 2008 · 100-400 with Kenko TC AF????
  
 
tanglefoot47
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p.1 #1 · p.1 #1 · 100-400 with Kenko TC AF????


I heard today that the Kenko pro 300 1.4 TC will AF with the 100-400 is this true?

Thanks

Mike



Jan 23, 2008 at 03:41 AM
adam613
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p.1 #2 · p.1 #2 · 100-400 with Kenko TC AF????


If you tape the right pins, the Kenko Pro 300 1.4 TC will *try* to autofocus no matter what you put in front of it. Whether it will succeed is an entirely different question

I tried it once and it didn't work. But that was early in the morning. You might do ok in bright sunlight.

Edited on Jan 23, 2008 at 03:46 AM



Jan 23, 2008 at 03:45 AM
tanglefoot47
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p.1 #3 · p.1 #3 · 100-400 with Kenko TC AF????


This is what I heard but I was just checking. I tried the tape trick with the Canon TC and didn't like the performance so that was the end of that. I am using a cheap Tamron and works great


Jan 23, 2008 at 03:47 AM
floris
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p.1 #4 · p.1 #4 · 100-400 with Kenko TC AF????


I love the performance on my 100-400 and taped kenko TC.

http://florisvanbreugel.smugmug.com/photos/242289976-XL.jpg

100% crop:
http://florisvanbreugel.smugmug.com/photos/242296351-XL.jpg

It's a little finicky, and takes some patience and practice and whatnot, but it can certainly deliver in the right hands.




Jan 23, 2008 at 04:06 AM
CKrueger
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p.1 #5 · p.1 #5 · 100-400 with Kenko TC AF????


If you didn't like the performance of the Canon (and assuming you didn't have a bad copy), The Kenko isn't going to be "better enough" to make you happy. From all accounts, the Canon/Kenko/Tamron/Sigma 1.4x TCs are very similar.

FWIW, my 100-400 with my Kenko 1.4x will AF a lot better with my 5D than my 350D. The former is usable in decent light. The latter is poor in anything but broad daylight.



Jan 23, 2008 at 06:22 AM
tanglefoot47
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p.1 #6 · p.1 #6 · 100-400 with Kenko TC AF????


Hey CK

The performance I was talking about is when the pins were taped. I had a heck of a time with the lens trying to lock on. It the lens wanted to hunt like crazy. I am wanting the Kenko because I was thinking it would AF on the 100-400 I know it won't be better than the Canon but they are very close.

You mention your Kenko will AF but is that with the pins taped?



Jan 23, 2008 at 06:52 AM
bruceali
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p.1 #7 · p.1 #7 · 100-400 with Kenko TC AF????


I use a Tamron 1.4 TC with my 100-400, doesn't need pin covering, does AF, and works perfect.
Bruce



Jan 23, 2008 at 07:07 AM
Fred Relaix
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p.1 #8 · p.1 #8 · 100-400 with Kenko TC AF????


bruceali wrote:
I use a Tamron 1.4 TC with my 100-400, doesn't need pin covering, does AF, and works perfect.
Bruce


Is it the 1.4x Teleplus Pro 300 DG Teleconverter for Canon EOS? Which camera are you using?



Jan 23, 2008 at 08:09 AM
keithreeder
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p.1 #9 · p.1 #9 · 100-400 with Kenko TC AF????


Fred beat me to it - the body is important in this question.

The 100-400mm/Kenko 1.4x/30D combo works very well in my experience, but the 40D? Forget it.




Edited on Jan 23, 2008 at 09:11 AM



Jan 23, 2008 at 09:10 AM
Fred Relaix
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p.1 #10 · p.1 #10 · 100-400 with Kenko TC AF????


Keith, this is surprising that the 40D does not work as well as the 30D, considering the (supposed) improved AF. Did you have to tape the pins in order to get the 30D to AF with the 100-400/Kenko 1.4x. Same question with the 40D? Thanks!


Jan 23, 2008 at 09:47 AM
 

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Pixel Perfect
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p.1 #11 · p.1 #11 · 100-400 with Kenko TC AF????


Fred Relaix wrote:
Keith, this is surprising that the 40D does not work as well as the 30D, considering the (supposed) improved AF. Did you have to tape the pins in order to get the 30D to AF with the 100-400/Kenko 1.4x. Same question with the 40D? Thanks!


It appears as though Canon has now enforced the f/5.6 limit with the 40D much more thoroughly.



Jan 23, 2008 at 10:07 AM
keithreeder
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p.1 #12 · p.1 #12 · 100-400 with Kenko TC AF????


Hi Fred,

pins taped both times.

It would appear that the increased sensitivity of the 40D's centre AF sensor compared to the 30D puts extra demands on the AF system when we're trying to fool it into playing nicely with a minimum f/5.6 aperture lens, and it reacts accordingly.

Fair enough, really - it was never supposed to work.

Funnily enough though, AF is OK if you use one of the 40D's peripheral AF points.



Jan 23, 2008 at 01:04 PM
rachp
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p.1 #13 · p.1 #13 · 100-400 with Kenko TC AF????


tanglefoot47 wrote:
This is what I heard but I was just checking. I tried the tape trick with the Canon TC and didn't like the performance so that was the end of that. I am using a cheap Tamron and works great


I am using the cheap Tamron on my 400 f5.6 and 40D and it works great, too. So, if you like the performance with the Tamron why are you looking at the Kenko? Do you not like the image quality? Just wondering



Jan 23, 2008 at 02:14 PM
tanglefoot47
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p.1 #14 · p.1 #14 · 100-400 with Kenko TC AF????


Haven't used the Tamron yet but I know it will AF also I believe the Kenko is one of the best there is in the after market


Jan 23, 2008 at 11:49 PM
CKrueger
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p.1 #15 · p.1 #15 · 100-400 with Kenko TC AF????


tanglefoot47 wrote:
Hey CK

The performance I was talking about is when the pins were taped. I had a heck of a time with the lens trying to lock on. It the lens wanted to hunt like crazy. I am wanting the Kenko because I was thinking it would AF on the 100-400 I know it won't be better than the Canon but they are very close.

You mention your Kenko will AF but is that with the pins taped?


Yes, the Kenko 1.4x on a 100-400 makes it an f/8 lens on the long end. It will AF on the 1D bodies (which can use the center AF point at f/8), but it will not AF on any of Canon's others, including my 5D and 350D.



Jan 24, 2008 at 10:36 PM
CKrueger
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p.1 #16 · p.1 #16 · 100-400 with Kenko TC AF????


keithreeder wrote:
The 100-400mm/Kenko 1.4x/30D combo works very well in my experience, but the 40D? Forget it.


Fred Relaix wrote:
Keith, this is surprising that the 40D does not work as well as the 30D, considering the (supposed) improved AF. Did you have to tape the pins in order to get the 30D to AF with the 100-400/Kenko 1.4x. Same question with the 40D? Thanks!


Could you guys expound upon that? This is the first I've heard of the 40D being particularly bad at f/8.

I've got a 350D and 5D right now and I was hoping to get a crop body with a center-point AF as/nearly as good as the 5D. The 40D was at the top of my list until I heard this....



Jan 24, 2008 at 10:46 PM
Rocketball
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p.1 #17 · p.1 #17 · 100-400 with Kenko TC AF????


tanglefoot47 wrote:
I am using a cheap Tamron and works great



Mine works great too on my 20D. Have not heard of any issues with the 40D, but it's definately someting I'm going to watch for.



Jan 25, 2008 at 12:12 AM
TEASER
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p.1 #18 · p.1 #18 · 100-400 with Kenko TC AF????


bruceali wrote:
I use a Tamron 1.4 TC with my 100-400, doesn't need pin covering, does AF, and works perfect.
Bruce



Bruce is right on:

my 40D, TAMRON-F AF Tele converter / 100-400 AF works great



Jan 25, 2008 at 01:19 AM
jkurkjia
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p.1 #19 · p.1 #19 · 100-400 with Kenko TC AF????


TEASER wrote:
Bruce is right on:

my 40D, TAMRON-F AF Tele converter / 100-400 AF works great


By any chance have you had an opportunity to compare optical quality with your Tamron-F (I'm assuming it's a 1.4X) versus the Canon 1.4X converter? I already own the Canon 1.4X but would pick up the Tamron in a heartbeat if I thought it would work well enough for me.

Regards,

Joe Kurkjian



Jan 25, 2008 at 02:01 AM
BogongBreeze
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p.1 #20 · p.1 #20 · 100-400 with Kenko TC AF????


CKrueger wrote:
Could you guys expound upon that? This is the first I've heard of the 40D being particularly bad at f/8.

I think you've misunderstood. The 40D is not 'bad' at f8, it has one of the best AF systems in its class and works well at any aperture .

The autofocus of the 40D, like the 5D and other xxD and xxxD bodies, is designed to work with lenses that when opened to their maximum aperture are at f/5.6 or wider - which is all canon ef and ef-s lenses and most after market lenses.

It is designed to not AF with lenses that have a maximum aperture smaller than f/5.6 (in other words, it won't work with an f/8 lens - this is different from an f/5.6 lens stopped down - for which AF WILL work). This means that it theoretically won't work with a f/5.6 lens that has a 1.4 adapter, making the total lens maximum aperture f/8. Neither will the AF of any canon body except the 1 series.

You can get around this limitation by fooling the body that you're using a f5/6 lens, by using a tamron teleconverter with no electronics, or by taping the pins on a kenko or canon teleconverter. This trick works with the outer focus points of the 40D, but not so well (if at all) with the highly sensitve centre point. The taping trick should also work with the 5D, 30D, 20D, 10D, and xxxD series.


Edited on Jan 25, 2008 at 02:07 AM



Jan 25, 2008 at 02:06 AM
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