- Dec 26, 2007
- Reaction score
i noticed the 40d uses CF, its so much bigger than SD or those memory sticks of the same capacity. what stops canon from using these physically smaller memory cards?
Historically... (and I still think now) CF cards have higher performance and greater capacity than SD cards. More data lines larger physical size to fit more inside.
There was a time that CF cards were pretty much all you had in the market too... (based on the much older PCMCIA standard) Both Nikon and Canon used CF cards. Some of Canon's higher end professional bodies used both CF and SD cards. Nikon just recently started switching to SD cards in their lower end... the high end Nikon D3 still uses CF cards. CF cards were adopted early and a change now would probably mildly annoy photographers with CF cards already in their stash.