Question about Canon EF 600mm f/4L Lens

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Autofocus with extender 2.0

Don't work

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With the EOS-1D series, EOS-1v and EOS-3, AF is possible, but with the center focusing point only

Posted on Apr 21, 2014

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Posted on Jan 02, 2017

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JZ300 Autofocus not working


Beyond sand getting in, the lens may have been damaged from the impact if it fell on the lens while extended. It may need to be serviced by a technician.

Apr 13, 2014 | FUJIFILM FinePix JZ300 Digital Camera

1 Answer

I have a weird problem. When i put the 50mm 1.8 on my D90 it continues to autofocus even when I switch the camera body to M mode instead of AF with the switch. I would like to be able to manually focus...


You probably have a problem with the A/M switch on the body-- flipping that switch should extend or contract the autofocus pin that drives the lens. This particular lens doesn't have its own focus motor, so there's no way that it could be focusing on its own without the pin from the body driving it.

Try taking the lens off of the camera and looking at the autofocus pin as you flip the switch from auto to manual focus.

Mar 10, 2011 | Nikon Normal AF Nikkor 50mm f/1.8D...

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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

Communication Error and Bad Autofocus in Canon 17-85mm lens


clean both the lens's contact and body's, if corrosion use nice emery paper.

Aug 19, 2017 | Canon EF-S 17-85MM F/4-5.6 IS USM Lens

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Lens compatability


Apparently, the extender is designed to work only with specific lenses. B&H Camera has a chart available here showing which lenses it is compatible with. Note that even if the extender will fit on a specific lens, autofocus capability is not always possible. All the lenses listed are professional series ("L") lenses, and I don't see any 75-300 or 18-200 listed.

Jan 26, 2009 | Canon Extender EF 2x II Lens Converter

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Canon Extender EX 1.4x ii not autofocussing


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. 
c9a9700.jpg

Jan 13, 2009 | Canon Extender EF 1.4x II Lens

1 Answer

Autoocus doesn't work


The first thing to check is that autofocus is enabled on the camera body.

The auto/manual focus selector switch is located on the front of the camera, just below the lens release button (on the left side as you look through the view finder). Make sure that the white dot on the selector lines up with the white dot under the AF (autofocus).

If this does not solve the problem, make sure that your lenses are set to autofocus mode as well.

Dec 25, 2008 | Nikon CA-1104-SMK for D70SLR

1 Answer

Autofocus function will not work on Canon 17 40mm 1.4 EF lens


Since the problem is limited to this lens, I highly doubt that you would have to replace the cameras AF sensors.
Since you only have the problem with this lens, I am afraid that you will have to get the lens repaired. Is the lens also 3 years old? Did you get it with MACK extended warranty?
Sometimes, Canon do these kinds of repairs for free, if they discover that there was some manufacturing error that caused it to fail. So be sure that you get it to a certified canon workshop. 
I hope this helps, 
/Chris

Nov 24, 2008 | Canon 35mm f/1.4L EF USM Autofocus Lens

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I have a canon ixus 70. When I use the zoom facility the pictures become blurred. WHY


Believe it to be a camera fault. Reason: zoom feature makes the lens extend for telephoto work, therefore, the autofocus feature should be working at any distance you set the lens for and your shots should be clear. Could be an autofocus problem or the lens and CCD are misaligned at the telephoto position. Have the camera checked by a qualified repairperson. Get an estimate first. You may want to ask this question at the Canon website also.  

Aug 22, 2008 | Canon Cameras

1 Answer

Quantaray 2x AF for Nikon


A 2x tele-extender will rob you of two stops of light. This is simply a matter of physics: you're looking at only one quarter of the scene, so you'll only get one quarter of the light.

You specified neither the camera body you're using nor the lens you're using the tele-extender with. Most Nikon bodies will not autofocus with lenses slower than F/5.6. (Actually, they might, but F/5.6 is what Nikon specifies.) With the two-step penalty, a lens would have to be F/2.8 or faster in order to autofocus.

The solution is to either get a faster lens ($2000 or so) or to switch off the autofocus and go manual.

May 11, 2008 | Quantaray (261660245) for Nikon AF Lens...

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