I just did a test with my 5D Mark III. I find Mr. Cable's claim that putting an SD card in the card slot slows down the CF card. Groundless.
I am using a 32GB Lexar Professional 600x card and a 32GB Sandisk Extreme Pro SD card. If I am reading correctly he states that if there is no card in the SD card slot the CF card will clear the buffer more quickly. That is not the case on my camera. I loaded up on High Speed 17 shots and each time the buffer clears the exact same time of about 5-7 sec., whether I have an SD card in the slot or not. I am using the second hand from my watch and this is very unscientific....but there is NO CHANGE in the buffer clear of my CF Cards.
Yes. With my SD card ..the buffer clears more slowly than my CF card. Quite a bit in fact. (take about 20 sec.) But my Extreme pro SD card clears MUCH more quickly (LIKE 2x AS FAST ) AS MY 15MB/s SD card. So there is an notable increase in SD card performance as you install faster cards.
I just loaded in the new firmware...so I do not know if that made a difference....but I am VERY happy with this camera. VERY happy.
Perhaps I am misunderstanding his point...but I think that I got it correct.
« Last Edit: June 25, 2012, 08:56:57 PM by infared »
5D III +BG, 5D IV +BG, Canon 15mm f/2.8 Fisheye, Rokinon 15mm f/2.4, Canon 17mm f/4L TS-E, Canon 16-35mm f/4L IS, Sigma 20mm f/1.4 Art, Canon 35mm f/1.4L II, Canon 24-70mm f/2.8 II, Sigma 50mm f/1.4 Art, Canon 85mm f/1.2L, Canon 100mm f/2.8L Macro, Canon 70-200mm f/2.8L IS II & 1.4x III