Question about Canon Extender EF 1.4x II Lens

1 Answer

Canon Extender EX 1.4x ii not autofocussing

I have an EOS 40D with a 100-400 is usm lens. I just traded in my original EX 1.4x for a new EX 1.4x ii on the understanding that it would autofocus this lens. But it doesn't. Any ideas??

Posted by on

  • johnnoR Feb 27, 2009

    I've just bought a Canon 100-400mm lens, and my Canon 1.4 II extender prevents the autofocus from working. Taping the three end terminals brings SOME autofocus, but not at the full extension (400mm) end. The camera (40D) 'hunts' while autofocus tries to function, but it generally fails. Approximate MANUAL focussing seems to help the AF complete the job - but this is not what I had anticipated for wildlife photography.
    Any comments would be appreciated.


×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 36 Answers

The EOS 40D only use auto focus up to aperture 5.6. Only the 1-series use auto focus up to aperture 8. The adapter adds 1 stop to the lens aperture. Since the 100-400 is a 4.5-5.6, the aperture range with the extender mounted will be 6.3-8.
There is a work around though. Just place a thin strip of insulating tape over the three pins on the lefthand side (lens side of the extender). No damage will occur to the camera or teleconverter. 
Canon Extender EX 1.4x ii not autofocussing - c9a9700.jpg

Posted on Jan 19, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I'm looking for new drivers


Hello. Click HERE to view and download the drivers you need for your Canon EOS 40D.

Select your OS (Operating System - Windows XP, Vista, 7, etc.) and choose a category (Software, Firmware, etc). Download and save the driver to your computer. Run and install it properly!

I hope I helped!
If you have any other questions, please leave a reply!

Thank you for using FixYa!

May 29, 2011 | Canon EOS 40D Digital SLR Camera Digital...

1 Answer

40D flash will not pop up


i had this same problem with my 40D . you have to press the flash pop button and smack the side of the camera with your palm at the same time it clicks

Jan 12, 2011 | Canon EOS 40D Digital SLR Camera Digital...

1 Answer

Hi- purchased the Extender EF 2X II; it seems fine with my fixed focus 300mm, but the auto-focus doesn't operate with my 70-200mm EF IS USM zoom, in any mode. Any suggestions? Thanks G


You haven't stated which body you have but the AF will not work with the extender if the effective lens aperture is too low (remember that a 2x extender doubles the focal length but halves the effective aperture).

Canon's own website states: "Autofocusing does not operate if the effective maximum aperture is greater than f/5.6 (greater than f/8 on the EOS 1V and EOS 3)."

Aug 01, 2010 | Canon Extender EF 2x II Lens Converter

1 Answer

I have error 99 on my canon eos 40d. i have tried cleaning the gold contacts, replacing the lens, changing the battery. nothing worked. what do I do? thanks


you should google it i think you should take it to a repair shop. have fun look at this link http://www.lensrentals.com/news/2008.12.31/canon-err99 have fun!!

Feb 19, 2010 | Canon EOS 40D Digital SLR Camera Digital...

1 Answer

Cant adjust below f/5.6 on a eos 40d


You are correct in thinking that it should be possible to set the aperture wider than f/5.6 at the wide end of the zoom range.  My best guess is that the lens is defective.  I'd suggest returning it for a replacement.

Dec 21, 2008 | Canon EF-S 17-85MM F/4-5.6 IS USM Lens

1 Answer

Cannon lenses


All canon EF lenses (and compatibles e.g. Sigma EX) can be used with both analog and digital  EOS-bodies. Depending on the sensor size (usually smaller than a 35 mm negative) a crop-factor due to the smaller field of view must be considered.  Example: Canon EF 50mm/1.8 lens used on a digital EOS (40D, crop factor 1.6) equals a 80mm lens (50mm x 1.6) compared to analog cameras using 35mm film. Some digital EOS-models can also use EF-S lens-series.

Nov 28, 2008 | Canon EOS 40D Digital Camera

1 Answer

My Canon 40D can't handle bright yellow and reds. It blurs the detail and overly saturates the subject (flower close-ups) - so that the bright red poppy is overly saturated and lacks detail even though...


By the way are these RAW images? What type of lense are you actually using, check this

EOS-1Ds Mark III EOS-1D Mark III EOS-1D Mark II N
EOS-1Ds Mark II EOS-1D Mark II EOS-1Ds
EOS-1D EOS 5D EOS 40D
EOS 30D EOS DIGITAL REBEL XSi/EOS 450D EOS DIGITAL REBEL XTi/EOS 400D DIGITAL
Compatible Lenses
EF 14mm f/2.8L USM EF 28-70mm f/2.8L USM
EF 14mm f/2.8L II USM EF 28-135mm f/3.5-5.6 IS USM
EF 20mm f/2.8 USM EF 28-200mm f/3.5-5.6
EF 24mm f/1.4L USM EF 28-200mm f/3.5-5.6 USM
EF 28mm f/1.8 USM EF 28-300mm f/3.5-5.6L IS USM
EF 35mm f/1.4L USM EF 70-200mm f/2.8L USM
EF 50mm f/1.2L USM EF 70-200mm f/4L USM
EF 50mm f/1.4 USM EF 70-200mm f/2.8L IS USM
EF 85mm f/1.2L USM EF 70-200mm f/4L IS USM
EF 85mm f/1.2L II USM EF 100-400mm f/4.5-5.6L IS USM
EF 100mm f/2.8 Macro USM EF-S 60mm f/2.8 Macro USM
EF 135mm f/2L USM EF-S 10-22mm f/3.5-4.5 USM
EF 180mm f/3.5L Macro USM EF-S 17-55mm f/2.8 IS USM
EF 200mm f/2.8L USM EF-S 17-85mm f/4-5.6 USM
EF 200mm f/2.8L II USM EF-S 18-55mm f/3.5-5.6
EF 16-35mm f/2.8L USM EF-S 18-55mm f/3.5-5.6 II
EF 16-35mm f/2.8L II USM EF-S 18-55mm f/3.5-5.6 USM
EF 17-35mm f/2.8L USM EF-S 18-55mm f/3.5-5.6 II USM
EF 17-40mm f/4L USM EF-S 18-55mm f/3.5-5.6 IS
EF 24-70mm f/2.8L USM EF-S 55-250mm f/4-5.6 IS
EF 24-105mm f/4L IS USM -

Jun 30, 2008 | Canon Cameras

1 Answer

Indoor photography


If you're on a budget, the 50mm f/1.8 II is a great deal, $100ish, f/1.8 is great for low light.

If you have a bit more cash, the 50mm f/1.4 has better build quality (the 1.8 is all plastic) and much better autofocusing (its USM so its fast and quiet, as well as more reliable) and its also slightly sharper.

If you want a zoom, from canon theres the 17-55 f/2.8, which has image stabilizer and USM focusing.
Also, the 24-70mm f/2.8L, which has USM, and since its an L lens, fantastic optical quality. However, it will run you over a thousand most likely.

From sigma, theres several zoom options, the 28-70mm F2.8 EX DG, 24-70mm F2.8 EX DG MACRO, and 24-60mm F2.8 EX DG. All under $800 or so.

Dec 03, 2007 | Canon EOS 400D / Rebel XTi Digital Camera...

Not finding what you are looking for?
Canon Extender EF 1.4x II Lens Logo

534 people viewed this question

Ask a Question

Usually answered in minutes!

Top Canon Cameras Experts

kakima

Level 3 Expert

100140 Answers

TC CAMERA REPAIR.Com...

Level 2 Expert

164 Answers

old marine
old marine

Level 3 Expert

1660 Answers

Are you a Canon Camera Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...