On 11/24/02 4:06 PM, "Chris Brogden" <[EMAIL PROTECTED]> wrote:
> On Sun, 24 Nov 2002, KT Takeshita wrote: > >> Also, for any critical aperture control, the aperture ring is the only >> way. AV wheel is always the approximation. Full of measurment data to >> prove it. Even Pentax manufacturing people say so, although in low >> voice. > > I didn't know that. When have they said it? I was just lurking and do not wish to get dragged into any heavy discussion :-) but I thought everybody knew this. This was discussed a few years ago in PDML to a great extent as well. I personally saw a post by a Pentax manufacturing person in certain technical discussion, but I did not think it was any secret. Pentax did have models with AV wheel and they did not wish to say that it was not accurate. Let's just say that AV wheel control is less accurate than the aperture ring. Please do not balk at me as I never checked or understood where this error comes from (electro-mechanical but perhaps P�l knows better), but I remember accepting it true. >> Canon loves the approximation. If you feel their focusing is faster, >> but Z-1p hunts to the last bit of focus adjustment, that's because >> Canon's focus algorithm stops at certain range of approximation way >> before any Pentax focusing system stops dead on. > > Again, I didn't know this. Where did you hear this? It's all over the place. Some of the Japanese camera magazines are extremely technical and there are all kinds of technical analysis there. But Canon's focusing algorithm is well known. But you can't tell the difference through their viewfinder anyway :-). Maybe I will dig out this info when I have time. Cheers, Ken
