Norman Chappell schrieb: > > This is easily achieved by the method I mentioned previously which is to; > 1. switch the lens to MF to maintain the focus point determined by A-DEP > mode > 2. switch camera mode to Av > 3. select 1 or 2 stop smaller aperture then A-DEP suggested to achieve > desired CoC > 4. reframe and repress shutter to obtain correct EV reading for scene > (shutter speed will determine if you need IS, monopod, tripod, whatever). > > Thats it. > > This sounds much more complex than it is in practice, especially after > you've done it a few times, but it works. >
Well, thanks for the workaround, I'll give it a try at least. Of course I did know there ARE workarounds (several of them), but my real point is, that IMHO we shouldn't have to use workarounds at all. Applying program shift is a workaround as well, but this seems still acceptable. It just means turning the wheel one or two clicks, which just takes a fraction of a second and can be done without even looking at the aperture values. Now compare this to the procedure described above... You have to change program modes and AF mode ... > The ideal solution would be if Canon were to provide a CF to allow > selection of CoC size. Absolutely agreed. > > Bear in mind however, that if you accept that 0.035mm is good up to 7x5 > prints, then 0.017 is going to be good only up to 14x10. A compromise > becomes almost inevitable as close focus distance will often result in very > small apertures which in turn give very slow shutter speeds unless you use > high speed, higher grain film. Such is life and optical restraints. Yes, there's no free lunch! OTOH, you usually don't look at VERY big prints from the same distance. Also, the resolution of a 35mm film is limited anyway and stopping down too much will not only give slow shutter speeds but also increase diffraction. There's not much of a point in theoretical DOF calculations at small apertures if you don't include diffractional effects. There's also no point in using a CoC value that's smaller than the film can resolve, so there certainly ARE limits, you're quite right. Thomas Bantel * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
