Lost autofocus on 40D when using ST-E2 and 2 580EX
I lost auto focus on 40D when using ST-E2 and 2 580EX II. I tried multiple lenses, including EF 50mm f/1.4 and EF 70-200mm f/2.8L; the 40D would not auto focus. When I switched to a 30D body everything worked. What happened to the autofocus on the 40D and what can I do to get it back?
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You may just have the left auto focus points selected. You don't say which camera model you have. If on the back of your camera you can see a button with an icon showing 5 small white blocks in a plus sign in a white box press this to select the auto focus points. It should show the available auto focus points and then use the left/right (wheel) button to change the selection
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)."
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.
You need to send it in for service. The more you use it with the "noise", the more you are potentially damaging the auto-focus drive mechanism of the lens. The sound you are hearing is most likely the gears and whatnot grinding away at each other because they were knocked out of place by the impact of the fall. I don't know how much this will cost, but I would say somewhere in the $200 range would not be unbelievable. Sorry I don't have any good news, but I have "bounced" a lens or two in my time.
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 -