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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 26 Dec 2009 (Saturday) 19:22
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300mm f2.8L AF Trouble

 
canonnoob
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Dec 26, 2009 20:33 |  #16

Fathom_this wrote in post #9267706 (external link)
Yes, it is on. It records images and works fine with the lens in MF. Just nothing with the AF.

alrighty.. not being a jerk just had to ask..


David W.

  
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canonnoob
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Dec 26, 2009 20:34 |  #17

DDCSD wrote in post #9267717 (external link)
Try pushing the AF-on and * button to focus. The previous owner of your MkIII may have had focus removed from the shutter button.

If that doesn't work, try to reset the MkIII to factory defaults.


didnt even think of that!!! very good point..


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blackhawk
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Dec 26, 2009 20:45 |  #18

DDCSD wrote in post #9267717 (external link)
Try pushing the AF-on and * button to focus. The previous owner of your MkIII may have had focus removed from the shutter button.

If that doesn't work, try to reset the MkIII to factory defaults.

That's the first thing I would, better yet do a hard reset by pulling both batteries for a minute or so. This should clear the volatile memory which can become corrupted.

There are a lot of custom functions in that cam, it's complicated. Sounds like a setting issue. Also check the firmware version.
Contacts can be cleaned with isopropyl alcohol, but don't allow any to get inside the cam.


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DDCSD
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Dec 26, 2009 20:46 |  #19

canonnoob wrote in post #9267723 (external link)
didnt even think of that!!! very good point..


I had the exact opposite happen to me. I switched my AF back to the shutter button (I always use the * button) the other day so my family could use my camera. I couldn't figure out why I couldn't get it to AF when I finally went to use it!


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DDCSD
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Dec 26, 2009 20:47 |  #20

Isn't there an AF stop switch or something on that lens as well that corresponds with a Cfn?


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Fathom_this
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Dec 26, 2009 20:48 |  #21

DDCSD wrote in post #9267717 (external link)
Try pushing the AF-on and * button to focus. The previous owner of your MkIII may have had focus removed from the shutter button.

If that doesn't work, try to reset the MkIII to factory defaults.

Alright, now we are getting somewhere. After resetting to default, the AF does move when depressing the shutter half-way. I think all is normal now.

Thank you both for taking some time to help the rookie.


Joel
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Dec 26, 2009 20:56 |  #22

Fathom_this wrote in post #9267775 (external link)
Alright, now we are getting somewhere. After resetting to default, the AF does move when depressing the shutter half-way. I think all is normal now.

Thank you both for taking some time to help the rookie.

Glad all is well. Nothing like having $6,500+ worth of camera gear that isn't working right to get the heart rate up to dangerous levels. :lol:


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rakesh
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Dec 26, 2009 21:20 |  #23

I'm also using 300/2.8 and what I found is that when I click the shutter button half on my 40D/7D with 300/2.8 mounted, the Lens motor keeps on spurring and I don't feel that IS is working properly. I checked it on 100-400 lens and as soon as IS and focus is fixed, motors stops rotating. Can any one advise me on this behaviour of the lens.


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Fathom_this
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Dec 26, 2009 21:28 |  #24

DDCSD wrote in post #9267818 (external link)
Glad all is well. Nothing like having $6,500+ worth of camera gear that isn't working right to get the heart rate up to dangerous levels. :lol:

Exactly. The book doesn't really help much on that type of issue either. Just a bit of trial and error and some help from those in the know.

Thanks again.


Joel
EOS 1d Mk III | EOS XSi | EF 300mm f/2.8L IS USM | EF 70-200 f/2.8L IS USM | EF 50mm f/1.8 MkI(metal mount) | EF-S 55-250mm f/4-5.6 IS |1.4x TC II | monopod, tripod, and filters

  
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300mm f2.8L AF Trouble
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