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Author Topic: 5D MARK III - does not read CF card  (Read 4675 times)


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5D MARK III - does not read CF card
« on: July 30, 2012, 12:43:59 PM »
HI Guys
If I insert my 8GB Lexar Pro 300x UDMA CF card into my mark 3 - in the viewfinder I geat a message saying
Card1 cannot be accessed - reinsert\change card - I have tried another card (brand new) but still same problem. Both cards works on my computer and laptop - and external USB card reader. I have formatted the cards several times. The mark 3 can access the sdhc cards no problem - its the CF cards. I do not get an error Code. I have tried using the camera to format  the cards - but it says 'cannot format - change card'.

Thanks in advance


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Re: 5D MARK III - does not read CF card
« Reply #1 on: July 30, 2012, 12:46:59 PM »
That doesn't sound good. Especially with a brand new card. Give Canon warranty services a call.
5D mark 2, 5D mark 3, EF 17-40mm f/4L,  EF 24-105mm f/4L IS USM, EF 135mm f/2L, EF 85mm f/1.8
Film Cameras: Mamiya RB67, RB-50, RB-180-C, RB-90-C, RB-50, Perkeo I folder, Mamiya Six Folder (Pre-WWII model)


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Re: 5D MARK III - does not read CF card
« Reply #2 on: July 30, 2012, 04:12:20 PM »
time to call Canon

i use the 32gb 1000x and absolutely love it...blazing fast...looks like your card slot has some issues...

does SD work?

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Re: 5D MARK III - does not read CF card
« Reply #3 on: July 30, 2012, 05:02:58 PM »
Get some good light and look into the card slot at the pins.  A magnifying glass might help.
Look for pins that are bent over.  They symptoms are of a bent pin.  Bent pins in the camera body are a serious issue with CF cards, it doesn't happen too often, but when it does, it can be expensive.  I've had a 50% success in fixing them, and my job involved engineering and testing things like this in a lab. 
Being a high reliability company, we would not even consider putting a product on the market with pins in the power side of the interface.  Power gets bent and touches ground or other circuit element, and the whole camera is slagged.  If not, its just a few hundred to replace the card socket.
A really really poor design, but its worked its way into being a standard for many years now.
Thats why many cameras use SD cards.  They might not be as fast, but if they fail, you toss a cheap card rather than the camera.