Re: what microcopy
- From: Dr Engelbert Buxbaum <engelbert_buxbaum@xxxxxxxxxxx>
- Date: Sat, 13 Jan 2007 14:00:05 -0400
tax wrote:
my brother in law,14 yo is interested in microcopy, i have a simple question
:what kind of microspy i can buy and what caracteristic i have to consider
much important
May be it would be best not to start with a microscope, but a magnifying
glass (jewelers type with 10 times magnification). If the child develops
a real interest in science (documented for example by the drawings of
the things (s)he observes) and reads up on the subject, one could
consider buying a microscope later.
The most important thing to realise about microscopes is that
magnification is not important - resolution is. Resolution is largely
determined by the numerical aperture (n.a.) of the objective, this
should be marked on each objective. If it's not, forget that
"microscope".
The minimum requirement stated above puts you in the 400--500 US$ price
range for a student microscope. A course microscope (with Koehler
illumination) sells for about 3 times that price and a fully fledged lab
microscope is about 100 times that expensive. Clearly not the sort of
money you want to invest for a brief spell of fancy - hence my advise
about the magnifying glas.
May be the child could also use a microscope in school or in a local
microscopic society. That would have the advantage that (s)he would be
taught the proper technique of using it and of preparing samples - not a
trivial task.
Don't get me wrong: microscopy can be a very rewarding, lifelong hobby.
And possibly even a carreer. But a 20 $ styrofoam packed "microscope"
from a toy shop will start neither.
.
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