Re: Question re Olympus Universal Condenser

Dearest Herr Rohringer,

AADD?

I shouldn't really be answering, but as it seems you put a lot of
effort in replying, so let me be a good citizen and talk back. I gave
you two clear reasons of how an oil immersion objective behaves, or
indeed any immersion lens, when used without oil. From the condenser
point of view, imho the glare is more of a problem then the introduced
sferical abberation. Nevertheless, the effect in the whole is minimal,
but sure if you go to very critical side-by-side viewing you might see
this effect. I have tried to put this in perspective: slight
variations between coverglass/mounting medium thickness have far
greater effect on image quality, but very few people bother to take
that into account.

You showed us before an Ap image of yours made WITH immersed condenser
on your BX. So why can't you do this comparison yourself?

So if I have to answer again a question like this:
"Does this mean that for best results one should always oil the top
oil lens on
the Olympus universal condenser? "
I can only think of one straightforward answer: Obviously. But if you
would ask: Is it worth the trouble of oiling the condenser for nA<1? I
would say no, not for me, never seen the difference. In brightfield,
that is. But you might have to anyway, if the DIC system needs the top
lens oiled, even for nA<1.

R.v.W.


.

Relevant Pages

  • Re: immersion objectives with NA <1.0 - useable dry?
    ... > If an oil immersion lens has an iris that allows the N.A. to be reduced ... > I'm finding oil to be a messy deterrent to using high powers. ... You should not use these lenses without immersion liquid as these lenses ...
    (sci.techniques.microscopy)
  • Re: Zeiss Lens nomenclature/relative merit
    ... while others apparently do not require oil. ... Would a lens which does not require oil be more desirable, ... One point to watch out for: the more complex lenses of the 160mm era are generally excellent value on the second hand market, but do watch out for delamination. ... Note that, whatever tube length and class of objectives you use, pairing them with the correct eyepieces is important. ...
    (sci.techniques.microscopy)
  • Re: AC pressure switch field replaceable?
    ... Also, however much a system leaks R12, it ... Condenser size and air flow is the main issue on r134a retro fits. ... The issue of oil is also less of a problem on systems ...
    (rec.autos.tech)
  • Re: Double vs Single Condenser Lens
    ... involved fabricating a new lens board, fabricating a new neg holder, ... purchasing a new enlarging lens and replacing the condenser. ...
    (rec.photo.darkroom)
  • Re: Photomicrography ... objective questions (and general advice)
    ... E200-F only supports Koehler illumination with its Abbe condenser. ... uses a quirky relay lens to make Koeher illumination work. ... Don't buy a new scope if you budget is below US$3000. ...
    (sci.techniques.microscopy)