Re: Auto-focus on digital SLRs.

"nospam" <nospam@[EMAIL PROTECTED]
> wrote in message 
news:220220081234494217%nospam@[EMAIL PROTECTED]
> In article <47Gvj.2472$g81.875@[EMAIL PROTECTED]
>, Anon
> <abuse@[EMAIL PROTECTED]
> wrote:
>
>> Remember auto-focus is a contrast detection system,
>
> on a dslr, it's a phase detection system (unless in live view mode on
> some cameras).  point&shoots use contrast detection.

True, but whichever system is used they all need to be able to detect some

difference in contrast.

Try getting a dslr to focus on a white card or a blank wall when there's 
nothing else in view...