This is description of this part:
Special diaphragm in holder for the polarizing condenser of the Lomo Polam microscope.
Together with the Lomo Polam polarizing microscope, a set of five such special diaphragms was supplied. The set included phase contrast diaphragms and dark field diaphragms.
Note - I am showing and offering here one single diaphragm in holder - exactly the one visible in the photos. This is a phase contrast diaphragm (phase annulus). The complete set for the Lomo Polam microscope contains 5 diaphragms.
Important note:
Such diaphragms in a special holder, supplied as a set of five diaphragms, were an accessory for the Lomo Polam polarizing microscope. These diaphragms are mounted onto the polarizing microscope condenser in order to combine these observation techniques and obtain a phase image in polarized light. Please note that the same condensers can also be used in Lomo MIN series polarizing microscopes (for example Lomo MIN-6 or Lomo MIN-8 models) and in Lomo MIK series infrared microscopes (for example Lomo MIK-4). This means that there is nothing preventing the use of these phase annuli in those microscopes as well.
The newest version of the Lomo Polam microscope, namely the Lomo Polam LMPR model, no longer requires this accessory. The Lomo Polam LMPR already has a special polarizing phase contrast disc condenser (somewhat similar to the Lomo KF-4 condenser).
In the last photo in the gallery you can see a page from the Lomo Polam microscope manual where this element is shown. In the manual it is shown in figure number 6, element number 65.
The complete instruction manual for the Lomo Polam microscope is available here: https://www.facebook.com/groups/102512763506243/?multi_permalinks=1858054457952056
What is this part needed for?
- if you have a compatible Lomo condenser and want to use this special phase contrast diaphragm
- if you want to combine several observation techniques, for example polarization and phase contrast at the same time
