-=FAQ=- Teleconverter/T-Con Tele extender Discussion

So is the kenko pro300 1.4x better then the Sigma APO 1.4x?

It would seem then that the Kenko pro300 2x hooked to a Sigma 100-300mm f/4 would AF in good light?
anyone? I've read about the Kenko's working at f/8

Can't comment on the 2X.. but I have never heard of someone getting a 2X to "fool" a camera into focusing.
I'm not saying it's never happened, only that it seems unheard of.

I've heard of the "tape the pins" trick...can anyone explain which pins to tape? I'm conflictd....I know the 1.4x is the better choice(quality and speed) but after having a crappy one for a week, It left me wanting even more Zoom! So can people post pics of 2x teleconverter pics? Any of them. 70-200mm, 120-300mm, 400mm etc Thanks

Look at the FRONT of your T-con..
The three pins to the left side (counter clockwise) are the ones to tape.

Final question.....Will this work on the Sigma 2x or Kenko only?

There's no guarantee it will work at all,. as I said I've not ever heard of this working on a 2X.

The pin layout is the same on all of the t-cons mentioned though,. so you can try it.

I've tried it with Sigma and Canon 1.4X T-cons with mixed results on various lenses.
The Kenko 1.4x does not require the tape trick as it allready lies to the camera.. no tape needed.

Tape trick is never a sure thing,. sometimes it works, sometimes it doesn't (my experience is that most often it either doesn't work or works very poorly.)

One person may have a 20D and a 100-400mm with a taped 1.4X and it works great,. another may have the exact same gear and it won't work at all...

Most common side effect is extreme hunting and focus "chatter" .. worse case scenerio... you don't heed the warning signs of excessive hunting and keep shooting anyway,. and burn out your focus motor.

Thanks....Sounds like the 1.4x "sure thing" is the better bet

Here is an interesting compairison of the Canon 1.4X and 2.0X teleconverters, to the Kenko Pro 300 1.4X and 2.0X on a Canon 300mm F4 L IS lens.

A Canon 20D (1.6 crop) camera was used in the testing (so you will have an idea about were the "edge" is in the cited results).

See:

http://www.eospix.com/​content-20.html

Enjoy! Lon

I used the Quantaray 2x converter on my 1D and 400 5.6L a few days back. I had af and it worked great... here is a pic handheld

http://static.flickr.c​om/1/122289365_8a71e19​a33_b.jpg

Camera: Canon EOS-1D
Exposure: 0.002 sec (1/500)
Aperture: f/5.6 (actually f11)
Focal Length: 400 mm (1040mm)
ISO Speed: 640
Exposure Bias: 1/3 EV

Jon answered your question.. the original post on the front page of your thread answers these questions. Based on those answers and that your second post asks nothing more specific,. I can't think of another answer to help any further?

I'll reiterate..
Canon and Sigma won't fit.
Tamron will,.
As to AF,. no one can answer this exactly. There is no direct answer other than to repeat what the specs say.. it won't work.

AF is not supposed to work with that lens and body regardless of T-con. this is stated clearly in the first post of this thread.

But it might.

However, even if I had the saem tyoe of camera and same lens and a converter that did allow full AF,. this is no guarantee that it will work with another of the same.

I have the Kenko 1.5x DG SHQ ($86.95 at B&H). In sufficient light, it allows my 70-300 IS to AF just fine. In shade or low light, it hunts endlessly, though.

Used it to snag quite a few pictures at the F1 race in Melbourne (though most came out poorly due to the fencing).

I have the Kenko and the 70-300 IS. In medium to bright daylight, I have no problems with AF. Nothing special, but this one was done with the combination in question.

HOSTED PHOTO
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I just took several shots in my yard with the Kenko Pro300 1.4. This was with the 70-300 IS USM. Using ISO 400, 1/800 f5 with AF. Mexican Bird of Paradise.
http://****/n77r5

Well I just got my Kenko 1.4x Teleplus Pro DG Teleconverter and .....

1. It's fantastic
2. It seems to enable me to focus much closer - I suppose it's because it acts like an extension tube, sitting between my camera and 100-400. It is manual focus though.