Re: APO and IR

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On  9 Dec 96 at 16:49, Robert Long wrote:

> On Mon, 09 Dec 1996 14:01:46 +0000 (GMT), you wrote:
> 
> |(those who once followed the APO discussions on rec.photo.*, about a=20
> |year ago, with Bob Salomon participating also, know that not even the=20
> |experts use two different definitions)

(PS: the 'not' in the above is a typo)
 
> And it was my understanding from at least one post in those
> discussions that the fancy footwork required to maintain relatively
> linear focusing behaviour throughout the visible spectrum can, in some
> cases, result in *poorer* behavior in the IR spectrum.

Those are probably Sigma badged....;-))

Not sure whether that was a real world example or an 
extrapolation from the graphs in a worst case scenario.

I stick with the Leica definition....*someone* has to set the 
definition anyway....;-))

 
--
Bye,

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      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]

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Topic No. 10