CZJ Epival Instandsetzung

[vonsth]

Hi Enzo,

The condensor is not related to the serial numbers of the interphako - this will not solve the interference-problem.

Concerning the diaphragms: Of course the size-relation between the rings needs to match, maybe you have some available with just one ring? I attach an image of the ones I used for the images above - they are located maybe 1cm below the original aperture of the pancratic and then focused and aligned with one of the rings of the interphako-slider. Or you block the outer one with the aperture of the pancratic and just use the inner ring?

Concerning the interference: If the rings match or not should not matter. If correctly aligned, then in the back-focal-plane (with betrandlense pulled) it needs to be possible to have only one color using the vertical/horizontal adjustment knobs and then change this color with the measurement-wedge on the right side of the interferometer. If this condition cannot be reached there seems to be a misalignment. Compare also: https://www.mikroskopie-forum.de/index.php?topic=37305.0, where Carsten changed slightly the angle of the top-interphako-wedge. (However, for the last post: there is no magic material, it´s just two glas-wedges, finely matched in their combined thickness to the interferometer, and turned to the correct almost-zero angle, with opaque regions on the first one.)
Maybe you do get it running - seeing any interference at all really means, that the device should be working and was once matched - otherwise if you are off by >10-15µm there is nothing, absolutely nothing to be seen in whitelight.
All the best
Martin

[3nzo]

Hi Martin,
I have the slide for Interphako with two double rings (like the Phv ones) of different sizes plus a diaphragm with double rings for Phv, under the Pancraticus (original accessory). The relationships between the dimensions of the pairs of rings do not correspond and I can only center the external or internal, but from what you say I can obscure the external ring with the pancratic diaphragm and work only with the internal ring. I thought two rings were needed, but if you got the result with a simple ring, I'll try it too and let you know.
Thanks for the information and best regards.

Enzo

[vonsth]

Hi Enzo,

apart from the possible chromatic aberrations from the pancrat, that is exactly what I was referring to with "quite a lot" in the previous posts here.
If you only use the inner ring, you are actually performing what CZJ calles the "strict" interphako. In the PERAVAL manual they state, that then "one to two interference-fringes in the field" are acceptable.
It however will not completely resolve the issue with the non-uniform coloring in the back-focal-plane.
Best Luck!
Martin

[3nzo]

Hi Martin,
nothing to do, there is no coincidence in the dimensions of the rings, if with the pancratic zoom I make the internal circumference coincide, the external one does not coincide and vice versa. I'll put the Interphako back in the attic, waiting to find a dedicated capacitor, but I have little hope. Too bad, because everything works, but I don't have the accessories.
Thanks and best regards.

Enzo