RE: Digital Camera Resolution WAS: Warning of major NHS IT overspend

["Owen Lewis" <[EMAIL PROTECTED]>]

> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Brian
> Morrison
> Sent: 03 November 2004 15:52
> To: [EMAIL PROTECTED]
> Subject: Re: Digital Camera Resolution WAS: Warning of major NHS IT
> overspend
>
>
> I think that the limiting factor is always going to be the lenses as the
> sensor technology is maturing more rapidly than the old-fashioned
> business of grinding and polishing.

Somewhere I once picked up that, for the final stages of polishing the 200in
lens for the Mt Palomar refractor, some days had to pass between each short
polishing session. This was to avoid distortions that would otherwise have
become uncontrollable, due to local heating of the glass during the
polishing.

Owen