> > Hi Chip, > What were you using as a standardised target, and how did you time the > delays? Without standardisation and electronic timing of some > sort (webcam > / camcorder?) I doubt whether you can honestly make these > measurements. You > can't use a target with regular lines or patterns on because the image may > "beat" with the sensor's grid pattern in your cameras. I've had > this happen > occasionally with my EOS3 and it's a weird effect. Tilt the > camera slightly > and it finds focus OK. > I do know that turning AF off makes my EOS cameras react so fast that you > suddenly realise what an overhead AF represents! > > M Stewart Milton Keynes, UK > > >
Hi Milton, I was using CART (open wheel race cars similar to F1 cars but heavier with much more power), racing cars as targets during practice and qualifying. The weather was clear and in full sunlight. The sections I was shooting the cars at they topped out at about 170MPH on the back straight and as slow as 35-40MPH, this was a street course. I have since used my EOS 1n bodies and rented EOS 1nRS bodies at one of the super speedways where the cars reach well over 230MPH. At NHRA drag races I have had no problems capturing the Top Fuel cars (dragsters and funny cars), at over 335MPH as they head almost directly towards my position at the top end using my EF 300 2.8L mounted on an EF 2x. The EOS 5QD was less good at the dragsters but worked O.K. for CART cars though they were not as well focused as high a percentage of the time. Regards, Chip Louie * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
