> Vicente wrote: ... > With a f/4.5 lens, that is 3.5 stops slower the limit is > Ev 4.5 ISO 100 > 1/30 f/4.5 ISO 800 is Ev 6.5 ISO 100 > So, you are only 2 stops from the limit for that lens.
Hi Vincente, According to this argument, there is plenty of light to achieve autofocus. So perhaps it is a failing on the user side: 1) The AF assist beam was probably disabled, likely because it was annoying. 2) The AF sensor was not placed over an area with sufficient contrast (e.g. eyelid, eyebrows, lips) 3) AF performance on my EOS cameras seems to improve when I holding the camera still for a second before actually activating Autofocus. Cheers Julian Loke P.S. See the Autofocus FAQ by Chuck Westfall: http://groups.google.com/groups?ic=1&selm=3956D5C4%2EB35FE0F1% 40nospam.net * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
