No one is arguing this point. All Bill and I said is that we found it just as easy to focus a particular wide lens as a particular long lens on the D and the DS, physics and science notwithstanding. It was after that that "someone" said we were liars and that we were mistaken, etc. The thing is, rarely if ever are all things equal, and even if everything in the compendium you posted was equal, there's the human element to consider, and no two people are ever equal.
There is no personal opinion wrt our experiences. They are absolute. We put the lenses in question on the camera, stopped them down, and focused. Our comments reflect our experience. In fact. neither Bill nor I have argued against the premise put forth by JCO. All we did was report what we found in our particular situations. I have since tried the with a couple of other lenses, and in every instance I found it just as easy to focus a wide lens as a long lens on the istDS. The pics I took are all equally in focus. Perhaps those of you relying on science and physics should pick up a couple of appropriate lenses, stick 'em on your istD or istDS, and see what your results are instead of quoting the laws of physics, which you did with a large list of qualifiers. Shel > [Original Message] > From: Cory Papenfuss > > You're correct on this JCO. Bill Robb is bating you. Ignore him and > > he'll stop. > > Paul > > Agreed. > > Everything else being equal (aperture, contrast, resolution, > helical gear cut, etc), a longer focal length (e.g. 105mm) will have a > higher "focusing sensitivity" than a wide angle (e.g. 35mm). That's just > plain physics. > > Anyone trying to argue otherwise (e.g. Will Robb) is either > ignoring one or more of these factors, or using the "personal opinion" > argument, to which there is no refute. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
