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Cameras, Lenses and Accessories: Discuss Canon Teleconverters...Will all teleconvertors work with EF and EF-S lenses, or should I look a bit more carefully before purchasing? Thanks...
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Old 30-09-2008, 16:19   #1 (permalink)
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Canon Teleconverters

Will all teleconvertors work with EF and EF-S lenses, or should I look a bit more carefully before purchasing?

Thanks
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Old 30-09-2008, 16:28   #2 (permalink)
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Re: Canon Teleconverters

Not got good knowledge of Canon gear, bit I think you have to watch out for the rear element of the lens touching the converter lens elements if it protrudes from the mount.

Someone who knows for sure will be along soon.
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Old 30-09-2008, 16:46   #3 (permalink)
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Re: Canon Teleconverters

The quick answer is no. There's a list of compatible lenses here...

Canon Extender EF Lenses - Canon UK

For maximum compatibility, I'd recommended the Kenko TCs which do not have a protruding element and will fit most Canon and third-party lenses. You may lose autofocus with any TC, depending on the max aperture of the lens. The 1.4x TCs are better here - you still lose one stop of aperture but they should work with lenses f/5.6 and faster, or L-series lenses f/4 and faster. There's a little trick to get L-series lenses working better with 2x TCs where you normally need a max aperture of f/2.8 for AF to work, but I'll leave that for now.
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Old 30-09-2008, 16:49   #4 (permalink)
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Re: Canon Teleconverters

ok - thanks for th link... I will have a read
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Old 30-09-2008, 16:50   #5 (permalink)
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Re: Canon Teleconverters

There's also a Blue Peter style 2 minute non destructive modification to kenko Teleconvertors to allow auto focus on lenses f5.6 and lower.

Mind you it may work with all teleconvertors
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Old 30-09-2008, 16:59   #6 (permalink)
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Re: Canon Teleconverters

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Originally Posted by Chris H View Post
There's also a Blue Peter style 2 minute non destructive modification to kenko Teleconvertors to allow auto focus on lenses f5.6 and lower.

Mind you it may work with all teleconvertors
Sticky back plastic?

Or electrical tape perhaps?
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Old 30-09-2008, 17:02   #7 (permalink)
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Re: Canon Teleconverters

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Originally Posted by Slicker View Post
Will all teleconvertors work with EF and EF-S lenses, or should I look a bit more carefully before purchasing?

Thanks
They will only work with L lenses, Here is a list of compatible lenses ---> Clickity Click, this covers both .1x4 & 2x. I have hired both just now but not had much chance to test them. You could hire them here Clicky Here 12 quid each for a week to find out which suits you best before buying

HTH

Whoops! some fast typers here LOL

Last edited by Chilliman; 30-09-2008 at 17:04. Reason: Too slow in typing and got called away halfway through reply LOL
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Old 30-09-2008, 17:04   #8 (permalink)
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Re: Canon Teleconverters

wow - only with L lenses. I didn't expect to here that....
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Old 30-09-2008, 17:07   #9 (permalink)
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Re: Canon Teleconverters

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Originally Posted by Chris H View Post
There's also a Blue Peter style 2 minute non destructive modification to kenko Teleconvertors to allow auto focus on lenses f5.6 and lower.

Mind you it may work with all teleconvertors

And probably burn your camera out
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Old 30-09-2008, 17:17   #10 (permalink)
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Re: Canon Teleconverters

No, it's safe enough.

Most (all?) L-series lenses have 10 contacts, whereas other lenses have only 7. If you tape over the extra three contacts, you can get AF working on f/4 L-series lenses with a 2x TC.
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Old 30-09-2008, 17:17   #11 (permalink)
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Re: Canon Teleconverters

And probably not burn out the camera I use it on mine.

One small peice of sticky tape accross 3 pins, stops the camera detecting it has a teleconvertor on it. The camera then auto focuses without problem
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Old 30-09-2008, 17:40   #12 (permalink)
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Re: Canon Teleconverters

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Originally Posted by Chilliman View Post
They will only work with L lenses,
Quote:
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wow - only with L lenses. I didn't expect to here that....
That is because the information is incorrect

I have just tried a Kenco 1.4x Pro300 DG convertor on a Canon 50mm f/1.8 and a Tamron 28-75 f/2.8 lenses with my Canon 20D and both work perfectly. I know this is not an exhaustive list but those are the only non L lenses I own.
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Old 30-09-2008, 17:52   #13 (permalink)
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Re: Canon Teleconverters

To clarify.... As I said in post #3 above, the Kenko and most third-party TCs should work with any lens (subject to AF limitations with slow lenses). The Canon 'Extenders' are guaranteed to work only with the lenses listed in the link I gave. That's because they have a protruding front element which can foul the rear element of the lens.

So, unless you really want to pay for the Canon ones, the Kenko Pro300 TCs are cheaper and have wider compatibility.
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Old 30-09-2008, 19:19   #14 (permalink)
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Re: Canon Teleconverters

Which three pins do I tape Chris/Paul please? I didn't know that and as I have both the 1.4x and the 2x TC it is something I'd love to try.

Cheers,
Rob

Added: I assume it is the three furthest away from the larger contact end. Just had a look at them and that would make sense, assuming it is three together but I could be completely wrong. Cheers.

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Old 30-09-2008, 19:23   #15 (permalink)
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Re: Canon Teleconverters

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To clarify.... As I said in post #3 above, the Kenko and most third-party TCs should work with any lens (subject to AF limitations with slow lenses). The Canon 'Extenders' are guaranteed to work only with the lenses listed in the link I gave.
Sorry, my bad. I missed the Canon bit and wrongly thought we were talking about Canon compatible TC's
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Old 30-09-2008, 19:31   #16 (permalink)
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Re: Canon Teleconverters

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That is because the information is incorrect

I have just tried a Kenco 1.4x Pro300 DG convertor on a Canon 50mm f/1.8 and a Tamron 28-75 f/2.8 lenses with my Canon 20D and both work perfectly. I know this is not an exhaustive list but those are the only non L lenses I own.

They won't fit on a canon 1.4x
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Old 30-09-2008, 19:33   #17 (permalink)
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Re: Canon Teleconverters

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Originally Posted by Chris H View Post
And probably not burn out the camera I use it on mine.

One small peice of sticky tape accross 3 pins, stops the camera detecting it has a teleconvertor on it. The camera then auto focuses without problem
Yes you are over working the focus motor heard of quite a few going
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Old 30-09-2008, 19:49   #18 (permalink)
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Re: Canon Teleconverters

Here's what you do but first lets point out you DO THIS AT YOUR OWN RISK

But it works anyways

Looking into the front of the teleconvertor there are a row of tiny pins. The pins you need to cover with tape are the first 3 going clockwise.

These 3 pins tell the camera there is a teleconvertor fitted. So if you cover them up the camera has no idea and so will still autofocus down to quite low light levels.

DO NOT PUT YOUR 50MM nifty 50 plastic fantastic on it because it will hunt for focus from near to far focus and can damage that lens.

I use this method to allow me to fit my 100-400 and 1.4 convertor for moon shots



With the 40d I get 1.6 x 1.4 x 400mm which equates to 896mm lens
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Old 01-10-2008, 07:48   #19 (permalink)
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Re: Canon Teleconverters

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With the 40d I get 1.6 x 1.4 x 400mm which equates to 896mm lens
No actually you get 1.4 x 400 which equates to 560mm lens on a camera body that has a crop factor of 1.6x. It does not alter the true length of the lens. I guess thats a subject for a different thread though
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Old 01-10-2008, 09:48   #20 (permalink)
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Re: Canon Teleconverters

wow - I didn't think this would be quite as confusing as all of this.

I think the best thing to do is to look for a Kenco TC rather than getting the Canon - seeing as I have no L lenses as yet....

I assume the Kenco will be fine if/when I buy L lenses?
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Old 01-10-2008, 10:08   #21 (permalink)
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Re: Canon Teleconverters

Yes - the Kenko TCs are good, and can be used with any Canon or third-party lenses (subject to the AF considerations mentioned earlier).

Kenko do (at least) two quality ranges. The cheaper ones are supposed to be OK, but I (and Steve) have the Pro300 and these work very well. The 1.4x TC is a safer bet with regard to AF. You lose 1 stop of aperture (so an f/4 lens becomes f/5.6) compared with 2 stops for a 2x TC (f/4 becomes f/8).
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Old 01-10-2008, 10:27   #22 (permalink)
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Re: Canon Teleconverters

ok, got that..

thanks for the info! Helpfull as always!
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Old 01-10-2008, 16:13   #23 (permalink)
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Re: Canon Teleconverters

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Originally Posted by Slicker View Post
wow - I didn't think this would be quite as confusing as all of this.

I think the best thing to do is to look for a Kenco TC rather than getting the Canon - seeing as I have no L lenses as yet....

I assume the Kenco will be fine if/when I buy L lenses?
The Kenko is great for the money i bought one to go with my 300mmF/2.8L thinking if it was ok i would get the Canon and shift the Kenko but i can't see the point of getting the Canon know
here's one with Kenko Pro 300DG but don't expect it to work as well on a zoom lens
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Old 01-10-2008, 17:07   #24 (permalink)
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Re: Canon Teleconverters

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here's one with Kenko Pro 300DG but don't expect it to work as well on a zoom lens
I am curious as to why you think the TC would not work as well on a zoom lens?
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Old 01-10-2008, 18:04   #25 (permalink)
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Re: Canon Teleconverters

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I am curious as to why you think the TC would not work as well on a zoom lens?

It will work but picture quality is not great
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Old 01-10-2008, 18:59   #26 (permalink)
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Re: Canon Teleconverters

So you are saying that a TC's quality is dependant on the lens and not the TC?

I would disagree with that as it is impossible for the same item to be variable when there are no moving parts or variables in the part itself. The same model of TC could perform slightly differently to another same model, but the performance of the same TC does not change due to attaching it to a different lens. Assuming you are using the same camera then the only difference is the quality of the lens that you are using with it and I will accept that lesser quality lenses will give a poorer overall result but that has nothing to do with how the TC performs and has everything to do with the quality of the lenses.

You are implying that the TC's quality is variable depending on the lens it is used with it, which simply is not the case. It is a little like saying the camera's quality changes depending on the different lenses you may use, the end result will be different yes, but its all to do with the glass and not the camera.
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Old 01-10-2008, 19:06   #27 (permalink)
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Re: Canon Teleconverters

What i meant was the picture quality is not as good on a zoom as it is with a prime
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Old 01-10-2008, 19:13   #28 (permalink)
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Re: Canon Teleconverters

gsgary

I see where your coming from but as you must admit bringing quality into a subject is in itself subjective.

I use mainly L glass on my Canon and they are zoom lenses, there must be a slight payoff somewhere but you can't bring that into the equation. The image quality on a zoom is affected by the zooming and not a TC.

I use my Kenko Pro 300 1.4tc on my 100-400L and to be honest I think the biggest factor is camera shake even with stabilisation rather than any image degradation caused by my TC.
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Old 01-10-2008, 20:26   #29 (permalink)
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Re: Canon Teleconverters

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Originally Posted by gsgary View Post
What i meant was the picture quality is not as good on a zoom as it is with a prime
I agree with that in general, however that has nothing to do with the TC.

The quality of any TC is the same as any other same TC, no matter which lenses you use it with. If you use better lenses then yes, you will get better results but that has nothing to do with the TC itself.
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