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I just bought a used d50 it came with no cf card so I bought a Lexar professional 32 GB udma and a San Disk Extreme 64 GB udma7 when I put the sandisk in and try to formate the camera says can not formate card change card. And when I put the Lexar card in, the camera wont even turn on. can you tell me if I got a bad camera or is it a problem with it not being able to read those bigger cards
I am guessing you may mean the EOS 50D camera.
The most likely problem is that your CF cards have a capacity that is way too large for the camera. You need a FAT32 CF card. There are not all that many of those still available for sale as new. Look for cards with capacities in the 2-16GB range.
Go to the Canon support site for the 50D. Looks like firmware 1.0.9 will update camera to accept more recent UDMA 7 CF cards.
"Firmware Version 1.0.9 incorporates the following changes.
1. Optimizes the camera’s performance when using certain UDMA 7-compatible CF cards released in February 2012 or later.
2. Corrects wording in the Dutch language menu screen"
"A firmware update will not upgrade the older hardware."
Actually in this case, it will. I usually recommend you don't upgrade FW unless there is a benefit that you need. You need this one. However, I also recommend you stick with 16GB or lower.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.