Zeiss altes DIC

[Rene]

Dear all,

I am trying to get my Standard-DIC fitted with the right lenses, but do not know how perfect the homogenity of the background can be.

This is a planachro 6.3x (new Zeiss logo) with the middle-old DIC (condenser prism IIII, 0.63 nA pol toplens, exact Koehler position, tube-slider III). Objective performs perfect in brightfield, but gives inhomogenous background in DIC.  Is this acceptible or should I hand it back?

Full extinction setting:


work-setting, little bit heavier on the image then visually:


Thanks, René

[Blitzi72]

Hello René!

I just started a thread a couple of days ago in respect to the "old DIC" from Zeiss. You can find it here: http://www.mikroskopie-forum.de/index.php?topic=15037.0

It would be great if you could contribute with your pictures and comments there - as the intention of this thread was to establish kind of a "reference-library" of combinations from lenses and prisms of the "old DIC".

Regarding your pictures: In my opinion they look pretty ok (especially the first one). Maybe you can achieve somewhat more homogenious background by lowering the condenser a notch or two... As I found out, in respect to DIC, it is somtimes appropriate to move away from the "exact Köhler" illumination. I usually start at "exact Köhler" and then try to modify condenser or aperture settings to achive maximum contrast and homogenity of background.

Hope that helps!

P.S. Given that you own the "other" Planchromats build for the "old DIC" I would highly appreciate, if you could post some pictures as a reference in "my thread" as well, in order to build up that library

Thanks


Christian