Re: Plan sure, does apo or fl matter now?
- From: Kevin Cunningham <smskjc@xxxxxxxxxxxxxx>
- Date: Sun, 19 Apr 2009 06:05:16 -0700 (PDT)
On Apr 18, 10:12 pm, Rich <n...@xxxxxxxxxxx> wrote:
I understand the need for plan objectives, but given we can remove most
chromatic aberration from images today, are apo or fl objectives as
important today as before?
Geez, yes! Chromatic aberration has nothing to do with plan
correction, plan is flat field. Now just how flat field depends on
the maker.
Flourites and Apos have higher NA, and NA is the only number you
really need when examining a microscope since NA equals detail. Plan
lenses can be made using Achromats, Flourites or Apochromats, these
are the crucial details, then plan correction is nice. Achromats are
the most used objectives since they are cheap to make.
You might want to take a look at the Olympus or Nikon sites, they have
excellent stuff on microscopes. My book is a nice read too.
Thanks,
Kevin Cunningham
SMS
.
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