Re: [ATM] zone challenge

["Nils Olof Carlin" <nilsolof.carlin@telia.com>]

Steve,

(I' have been travelling and haven't had a chance to read the digests
collecting!)

>     http://www.visi.com/~mkoehler/zoneone/zoneone.html
>
> As I mention in the report, I would like to hear from anyone who gets the
right
> null the first time.  What technique did you use?  Please don't inundate
the
> lists with reports of your answers, especially if they follow my
prediction that
> most people will read about .004" inside the proper null.

This is very tell-tale. at
http://web.telia.com/~u41105032/couder/zcalc.htm
I have a discussion about how the polynomial coefficients affect the images.
If you had drawn the profiles just on top of each other, not one reversed,
you would have seen how one curve bulges a little up, the other down near
the middle. As a rule of thumb, I would say for the innermost zone, the
inner radius should not be less than half the outer radius to give a
reasonably similar light profile (at least if the zone width is the maximum
I recommend).

Nils Olof




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