So what is the deal with these. I have a 7D and use sandisk extreme cards. I pay about $170 for an 8gb card. I go to birds as art and Artie uses Delkin cards and has the 8gb 420X for $59! Why so cheap and will there be a noticeable difference with my 7D?
Sorry if this is a basic question but looking st speeds, I dont see how they are so cheap.







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