skibum5 wrote:
droopy1592 wrote
skibum5 wrote
droopy1592 wrote
davenfl wrote
You have to read the white papers on the new autofocus design for the 7D/1D4.
You have to have enough light to utilize the minimum shutter speed for maximum high frame rate of the Digic 4 system. This operates the same way on the 1D3 (Digic 3) and 1D4. The frame rate will slow if you cannot obtain exposure at a high enough shutter speed.
For example and directly out of the 1D4 (same for 7D) white paper:
11-2 Continuous Shooting Speed:
- Maximum 10 frames per second
- For all image recording quality setting in both One-Shot AF and AI-Servo AF at
1/500 second and higher shutter speeds
Therefore on a 7D/1D4 if your exposure is below 1/500 the frame rate begins to drop off. This has been discussed here in FM and other forums. You only get the 8(7D) and 10 (1D4) frames per second is you have enough light for the minimum high frame rate shutter speed. Obviously and logically your not going to get maximum frame rate if the shutter speed is 1/60 of a second. Gosh people it's really logical, think about it.
Dave Reading fail Dave! That is not the case! Go back and read the thread please. Even if you want black frames with no light in manual mode and set your shutter speed at 1/500s it will still drop down to 4fps. And no, all digic 3 and 4 cameras do not do it. 40D and 50D don't do it, nor does the 1D mkiii. again, so what?
does a 50D actually get more than 4 frames a second in focus in that lighting in ai servo?
even the horrible soccer field i shot at night didn't have lighting poor enough to drop it to 4fps yeah actually i have... A local night HS football game to be exact. To fight blur my shots were @ISO 6400 or greater and on the edges of the field i'd drop to 4fps.
Thanks. ok, well if you are ISO6400, f/2.8, 1/500th that is pretty extreme
but what makes you think it would produce anything close to 8fps of in focus pics in that lighting? maybe better to drop to 4 and get 2 or 3 in focus rather than 1 or 2?
does the 50D actually do well there??
Center point it does just fine. Dont know what all the fuss is about the 50D but I thought the center point rocked at focusing action. Pics might just be good at tiny sizes but it's still rapid fire. Did another football (church flag though) game with the 7D and got some slow down as the evening went on.