Re: Oblique Lighting Condensor Options

The Lomo condenser will fit CZJ scopes, very likely not the Zeiss-West
stuff, but I guess an adapter is made easily. In effect, it is not much
more then an offset for the iris only: a black plate with a hole
clamped under the condenser does the same. All condensers can be used;
the ordinary Abbe was originally designed for directing oblique
'pencil' light beams through the sample (at high NA), not for
brightfield... The directional oblique effect is striking indeed, but
directional. Especially for diatoms, circular oblique is a far better
choice, also well working with highest NA. And a nice DIY project.

At higher NA's, due to sferical abberation, the condenser needs to be
refocussed when used for oblique; with a good (alligned) setup, the
field iris still works for the koehlering procedure!

Rene.

Kevin Cunningham schreef:

> "scopes_r_us" <scopes_r_us@xxxxxxxxx> wrote in message
> news:1126679448.115090.276580@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >I would like to try an oblique lighting setup.
> >
> > I have seen a Lomo condensor (modeled after an early Zeiss design?)
> > that allows one to adjust the offset of the condensor.
> >
> > I have Zeiss, Leitz and Nikon 160mm stands available for use.
> >
> > What options for condensors are available for these stands that allow
> > one to offset the condensor like the Lomo?
> >
> > Thanks for any suggestions, links or advice.
> >
> > SRU
> >
>
> Actually old, short barreled Olympus Vanox systems will do oblique
> illumination. The condenser has two parts and the bottom part can be
> de-centered and rotated. If you did it correctly it looked like a DIC
> variant. Way back in the old days (early 80's) we sales guys would show
> prospective users this feature. All were interested and maybe 2 or 3 used
> it once. As new instruments came out this idea was abandoned.
>
> I don't know if any systems could use oblique or a Lomo condenser.
>
> Kevin Cunningham
> SMS

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