1ds MK2 & 8gb cf card problem

Mark_Cohran wrote in post #6068458
Well, my experience in electronics leads me to believe that the card is especially sensitive to power spikes. Attaching and detaching the lens would certainly change the power demand on the camera system, but what I don't understand is why it would do it if the camera is turned off when you change the lens.

well, I could bring the card and the camera both (the card works fine on my M3) when we get together for the NW meet and you could experience it if you want to...it's strange.

Permagrin wrote in post #6068466
well, I could bring the card and the camera both (the card works fine on my M3) when we get together for the NW meet and you could experience it if you want to...it's strange.

Oh, I believe you. I've seen some pretty weird electronic malfunctions in my day. I think you have a card that's just overly sensitive to power fluctuations.

I've never heard that before. I've changed lenses before while the camera was on but, never lost photos. Wierd...

Well so far kinda so good.
I haven't lost any pictures yet since switching cards which is a good thing, but was out shooting birds and after about 350 shots I couldn't view the photos I was taking.
Just a big question mark came up on screen, and said couldn't enlarge image.

Once back home all pictures were on the card and able to be downloaded though. A bit strange.

wow that is strange!

I haven't had any trouble since switching cards.

robbie321 wrote in post #5991979
When in doubt... SanDisk

+!
Ditto

Hi,

whilst searching for Firmware for my 1D Mark II to make it AF with my Sigma 500mm F4.5 EX HSM and a Canon Mark 1.4x II TC I came across version 1.2.6 which states -

This firmware update (version 1.2.6) includes the following improvements:

• Fix the phenomenon wherein the camera does not detect the capacity correctly when high-capacity recording media are initialized.

It is available HERE

I use an 8GB Sandisk Extreme IV CF card, and assorted 4GB CF cards in my 1DsII without any of the problems described here, fortunately.