One black line and one white line is a "PAIR"
of lines to me. Why would you need 4 lines
to make up a pair?
J
C
O
----------------------------------------------------------------------------
----
J.C. O'Connell mailto:[EMAIL PROTECTED] http://jcoconnell.com
----------------------------------------------------------------------------
----
-----Original Message-----
From: Keith Whaley [mailto:[EMAIL PROTECTED]
Sent: Monday, September 15, 2003 11:17 AM
To: [EMAIL PROTECTED]
Subject: Re: Lens resolution
Hi Mark,
One of anything cannot be a pair.
You have lines and spaces to work with.
A line "pair" cannot be construed to be one line & one space. It's got
to be two lines & two spaces.
One of each does not constitute a pair; two of each does.
So it seems to me.
keith
Mark Roberts wrote:
>
> "Bob Blakely" <[EMAIL PROTECTED]> wrote:
>
> >The wording, line pairs per mm, implies two black lines and two white
lines
> >in as much as "pairs" is plural and also because there are many more than
> >two lines in the target. This would mean that line pairs per mm would be
> >half of lines per mm.
>
> Hmm. At least one source I've seen regarded one black line and one white
> line as a "pair".
>
> --
> Mark Roberts
> Photography and writing
> www.robertstech.com
