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Mark 4 mystery?
Jesse Beals, Photographer
Tracyton | WA | USA | Posted: 10:36 AM on 01.24.15
->> So I am wondering if any of you have had this issue. We are on a four day event and one of our Mark 4's is acting weird. When we blast off an 8 frame action sequence we get one in focus, then 2 soft, 3 back focused sharp and the last 2 in focus again.

First I thought it was the lens so I pulled the 70-200 Series 1 lens and replace it with a 70-200 IS II lens. Same issues again even with a new lens. So we pulled the second lens off and tried it with a third 70-200 lens and again we get this odd focus sequence.

We have all the Mark 4's set to the same settings across the board yet this one body won't focus in a (8) frame burst. Camera looks to be trying to grab at the subject instead of locking in. I would have thought it was a lens focus issue not the body acting up.

Thought I might ask since I am on location and can't send off the body tell Monday.
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Colin Hackley, Photographer
Tallahassee | FL | USA | Posted: 11:23 AM on 01.24.15
->> Check the screws on the lens mount of the camera and the lenses to make sure they are tight. Clean the camera mount and lens mount contacts with rubbing alcohol. Look inside camera mirror box and make sure it is clean and there isn't a stray fiber blocking the AF sensor. Reset camera body to factory settings. Say a prayer to the deity of your choosing.
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Kevin Krows, Photographer
Forsyth | IL | USA | Posted: 11:25 AM on 01.24.15
->> Jesse - This is going to sound strange, but whenever odd things have happen to me on any of my 1 series I have simply reinstalled the firmware again. Many times this makes "strange things" disappear just as fast as they appeared. I also clear all settings back to the defaults and then reinstall my settings as well.

May not work but it's worth a try. Let us know if that works.
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Margaret Bowles, Photographer
Winter Park | CO | | Posted: 2:47 PM on 01.24.15
->> I had this happen with one of my Mark IV's and it was a problem with the mirror mount. I thought I was losing my mind. I had to send it in twice before they finally fixed it.
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Thread Title: Mark 4 mystery?
Thread Started By: Jesse Beals
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