Re: Canon kit lens review critiques show a pattern

On Mon, 25 Jul 2005 02:34:57 +0100, David Littlewood
<david@xxxxxxxxxxxxxxxxxx> wrote:

>In article <p0s7e1lqioj7hg58hvaodgu6dhkgu0pqus@xxxxxxx>, RichA
><none@xxxxxxxx> writes
>>>>
>>>I suspect one of the major reasons is that microscope lenses - like
>>>microcircuit process lenses - are designed to work correctly at one set
>>>of conjugate distances. They also have a very small field of view. The
>>>need for flexibility in working photographic lenses, and the hugely
>>>larger FoV, create much more serious constraints. And, as I said before,
>>>remember the example of enlarger lenses.
>>>
>>>David
>>
>>One thing about microscope performance from that era is it can be
>>improved by using more highly corrected (Plossl, orthoscopic)
>>eyepieces from telescope companies. They will allow you to view
>>a much more highly corrected (especially at the edges) field, even
>>compared to the so-called, "compensation eyepieces" from the
>>microscope.
>>-Rich
>
>I had not heard this. However, the different manufacturers used
>different criteria for correction (of CA). Some corrected entirely
>within the objective, using a "neutral" eyepiece; others (like Zeiss)
>under-corrected the objectives and arranged the balance of correction in
>the eyepiece. Using unmatched pairs of components can result in loss of
>quality. Worth a try, though, if I can find someone with the relevant
>type of eyepiece (and it fits!).
>
>David

That's the rub. The astronomical eyepieces don't fit the microscopes
from back when. Astro eyepieces come in three barrel sizes, 0.96",
1.25" and 2." Microscope eyepieces are slightly smaller than 0.96"
Newer microscopes carry larger diameter eyepieces, but they still
don't match, so adapters are needed.
But compared to those ancient Huygens-style microscope eyepieces,
they kill them. You can purchase a set of decent Plossl eyepieces
for about $80 so they are definitely a bargain.
Last time I checked out Zeiss's latest compensating eyepieces for
their modern scopes, they were over $500/ea.
-Rich
.

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