Query about EF and Plan Leitz objectives

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selwyn.stleger@gmail.com - 29 Apr 2007 10:16 GMT

Please can someone tell me the difference between Leitz EF and Plan
achromatic 160 mm objectives? Also, did they co-exist or did one
preceed the other?

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Kevin Cunningham - 29 Apr 2007 15:20 GMT

> Please can someone tell me the difference between Leitz EF and Plan
> achromatic 160 mm objectives? Also, did they co-exist or did one
> preceed the other?

The EF ("Even Field") objectives were make at the same time as the plans.
EF was a way to cover up the fact that these were Achromats with a fancier
name. Now the Plans preceded the EF by quite a period of time but for the
time the EF were produced they were produced along with the Plans. If you
can choose between them I'd jump on the Plans though my faves are the NPL
Flourotars.

Thanks,

Kevin Cunningham
SMS

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selwyn.stleger@gmail.com - 29 Apr 2007 17:10 GMT

> <selwyn.stle...@gmail.com> wrote in message
>
[quoted text clipped - 15 lines]
> Kevin Cunningham
> SMS

Thanks Kevin, that's most helpful.

Selwyn

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Natural Science Forum / Physics / Optics / April 2007

Query about EF and Plan Leitz objectives