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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 28 May 2007 (Monday) 11:37
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why does the canon 1.4x tc af so sloooow

 
tekkie
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May 28, 2007 11:37 |  #1

I was very surprised at how much the canon 1.4x tc II sucks at af, it jumps back and forth 4-5 times before it focuses, compared to my tamron that focuses pretty much instantly

I tried this on my 20d with both the 100-400L and the 400 5.6L and had the same result, I figured the canon one would be better at af but definetly not. I tried it with and without the tape trick, actually without the tape trick the af did not work at all .

I have not looked to see the diff in IQ but to me its pretty much pointless if the AF sucks that bad you will not get many bird shots because by the time it focuses the bird will be gone lol

I will stick with my tamron.


Canon 1DMKII, 7D, 5DMKII, 1D MKII
Canon 500L, 100-400L
, 70-200 2.8L, 17-40L, 24-105L, 24mm 2.8,50mm 1.4, 85mm 1.8, 135mm 2.8 SF, 100mm Macro
Canon 430 & 580 flashes

  
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SaSi
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May 28, 2007 12:06 |  #2

TCs are for faster than f/5.6 lenses. This is why without taping the contacts the camera refuses to AF with the TC attached.

Some lenses seem to take TCs better than others. For example, I was able to use the 500/4 with a non-registering 2xTC with full AF at top speed, while for whatever reason, my EF100/2.8 macro with Sigma 2xTC would hunt like crazy and then stop unfocused.

The official reason why the Canon TCs cause a drop on AF speed is that due to the loss of light, AF can become tricky. So the camera reduces AF speed to compensate for that and reduce hunting.




  
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mspringfield
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May 28, 2007 12:16 |  #3

It all depends on the lens you attach it to. Both of the lenses you chose are already pretty slow to begin with. Adding a TC will only multiply the slowness.

Try it on a faster lens it is very usable.


Michael Springfield - Chattanooga, TN
Canon 1DsMkIII, Canon EOS M, Canon 70-200mm 2.8L IS, Canon EF 1.4x II

  
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tekkie
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May 28, 2007 12:17 |  #4

the hunting with the canon is crazy compared to the tamron

I figured that if you used a canon tc that is designed for something like the 400mm that it would have worked much better than the tamron :(

oh well at least its just a rental and I wont have to keep it :)


Canon 1DMKII, 7D, 5DMKII, 1D MKII
Canon 500L, 100-400L
, 70-200 2.8L, 17-40L, 24-105L, 24mm 2.8,50mm 1.4, 85mm 1.8, 135mm 2.8 SF, 100mm Macro
Canon 430 & 580 flashes

  
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cosworth
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May 28, 2007 12:19 |  #5

Don't forget the limitations of your body mated to a system that is optimized for more expensive bodies.

Should still work well and I suspect sometihng is amiss as many other don't have this issue.

Maybe post a shot with exif intact and we can see all your camera setings - maybe a CF isn't set right or something.


people will always try to stop you doing the right thing if it is unconventional
Full frame and some primes.

  
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tekkie
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May 28, 2007 12:35 |  #6

yeah it would probably fair better on a 1D I am sure :(

the thing that urks me is the tamron is better :(

no custom settings set other than iso expansion which should not matter

I just tested it again with the 400, focused on part of a telephone transformer pole took almost 3 seconds, switch to the tamron TC and it did it in about 1. I tried the same tests on numerous objects by switching the tc back and forth with the exact same objects / setting and almost every time the tamron was faster. In a couple of instances they were the same speed. Its a bright sunny day here so even at 100 iso my shutter times were around 400.

oh well I was just curious how they faired up against each other now I know :)


Canon 1DMKII, 7D, 5DMKII, 1D MKII
Canon 500L, 100-400L
, 70-200 2.8L, 17-40L, 24-105L, 24mm 2.8,50mm 1.4, 85mm 1.8, 135mm 2.8 SF, 100mm Macro
Canon 430 & 580 flashes

  
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crn3371
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May 28, 2007 12:36 |  #7

Technically, your 20D needs f5.6 or faster to autofocus. You're loosing 1 stop with the tcon so to expect your 20D to autofocus at all at f8 is asking a lot. Taped pins, or not, everything I've read says that autofocus with a tcon on those two lenses is going to be iffy at best, unless you're using a 1 series body.




  
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cosworth
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May 28, 2007 12:41 |  #8

Good point crn3371. There will be a point where the 100-400 won't work (zoom and aperture). You may think about sticking a speedlight on there with the flash disabled for the AF-assist beam. See if that helps.

The Canon most likely says "I can't focus accurately so I'm quitting" where the Tamron fools or allows (somehow) for the lens/camera combo to say "I'll try to focus,but not accurately".

Sounds hocus pocus but electronics never truly behave according to plan I find.


people will always try to stop you doing the right thing if it is unconventional
Full frame and some primes.

  
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ed ­ rader
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May 28, 2007 12:51 |  #9

tekkie wrote in post #3280056 (external link)
I was very surprised at how much the canon 1.4x tc II sucks at af, it jumps back and forth 4-5 times before it focuses, compared to my tamron that focuses pretty much instantly

I tried this on my 20d with both the 100-400L and the 400 5.6L and had the same result, I figured the canon one would be better at af but definetly not. I tried it with and without the tape trick, actually without the tape trick the af did not work at all .

I have not looked to see the diff in IQ but to me its pretty much pointless if the AF sucks that bad you will not get many bird shots because by the time it focuses the bird will be gone lol

I will stick with my tamron.

that was my experience with the canon TC too. on my 70-200L f4 IS and 300L f4 IS the kenko pro just AFs faster and IQ is just as good if not better.

ed rader


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5D4, 80d, 16-35L F4 IS, 24-70L II, 70-200L F4 IS II, 100-400L II, sigma 15 FE, sigma 14 f1.8 art, tc 1.4 III, 430exII, gitzo 3542L + markins Q20, gitzo GT 1545T + markins Q3T, gitzo GM4562

  
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tekkie
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May 28, 2007 12:53 |  #10

ed rader wrote in post #3280400 (external link)
that was my experience with the canon TC too. on my 70-200L f4 IS and 300L f4 IS the kenko pro just AFs faster and IQ is just as good if not better.

ed rader

good to hear, at least its not just me :)


Canon 1DMKII, 7D, 5DMKII, 1D MKII
Canon 500L, 100-400L
, 70-200 2.8L, 17-40L, 24-105L, 24mm 2.8,50mm 1.4, 85mm 1.8, 135mm 2.8 SF, 100mm Macro
Canon 430 & 580 flashes

  
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ed ­ rader
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May 28, 2007 12:56 |  #11

tekkie wrote in post #3280416 (external link)
good to hear, at least its not just me :)

i was pretty disappointed with the canon TC. i sold my kenko TC without first trying the canon because i figured the canon would be better.

after a couple of outtings i bought another kenko and sold the canon.

ed rader


http://instagram.com/e​draderphotography/ (external link)
5D4, 80d, 16-35L F4 IS, 24-70L II, 70-200L F4 IS II, 100-400L II, sigma 15 FE, sigma 14 f1.8 art, tc 1.4 III, 430exII, gitzo 3542L + markins Q20, gitzo GT 1545T + markins Q3T, gitzo GM4562

  
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tekkie
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May 28, 2007 12:58 |  #12

cosworth wrote in post #3280356 (external link)
Good point crn3371. There will be a point where the 100-400 won't work (zoom and aperture). You may think about sticking a speedlight on there with the flash disabled for the AF-assist beam. See if that helps.

The Canon most likely says "I can't focus accurately so I'm quitting" where the Tamron fools or allows (somehow) for the lens/camera combo to say "I'll try to focus,but not accurately".

Sounds hocus pocus but electronics never truly behave according to plan I find.

If I put the tamron on the 100-400 there is no issue it focuses fine, the canon is slower

I just tried it with the 430 on their and no difference with the af

oh well


Canon 1DMKII, 7D, 5DMKII, 1D MKII
Canon 500L, 100-400L
, 70-200 2.8L, 17-40L, 24-105L, 24mm 2.8,50mm 1.4, 85mm 1.8, 135mm 2.8 SF, 100mm Macro
Canon 430 & 580 flashes

  
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tekkie
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May 28, 2007 13:01 |  #13

ed rader wrote in post #3280423 (external link)
i was pretty disappointed with the canon TC. i sold my kenko TC without first trying the canon because i figured the canon would be better.

after a couple of outtings i bought another kenko and sold the canon.

ed rader

yeah I wanted to see if I wanted to change my 100-400 for the 400 5.6 and figured at the same time I will test the canon tc, glad I did that first or I would be in the same position as you were :)


Canon 1DMKII, 7D, 5DMKII, 1D MKII
Canon 500L, 100-400L
, 70-200 2.8L, 17-40L, 24-105L, 24mm 2.8,50mm 1.4, 85mm 1.8, 135mm 2.8 SF, 100mm Macro
Canon 430 & 580 flashes

  
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ed ­ rader
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May 28, 2007 13:41 |  #14

tekkie wrote in post #3280432 (external link)
If I put the tamron on the 100-400 there is no issue it focuses fine, the canon is slower

I just tried it with the 430 on their and no difference with the af

oh well

your point is really getting muddied here.

bottom line in the kenko (tamron) works better than the canon TC.

that's my experience too.

ed rader


http://instagram.com/e​draderphotography/ (external link)
5D4, 80d, 16-35L F4 IS, 24-70L II, 70-200L F4 IS II, 100-400L II, sigma 15 FE, sigma 14 f1.8 art, tc 1.4 III, 430exII, gitzo 3542L + markins Q20, gitzo GT 1545T + markins Q3T, gitzo GM4562

  
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cookie99
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May 28, 2007 13:56 as a reply to  @ ed rader's post |  #15

Yes folks I agree.

Canon 1.4 works great on 135 F2 but sucks on the 300 F4 IS so I am buying the Tamron to use on my 70-200 and 300.

Sad but true.


Chris Cooke "Me transmitte sursum, Caledoni"
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why does the canon 1.4x tc af so sloooow
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