LOMO Polam P-113 Polarising Microscope

Posts relating to the use of the LOMO Polam P-113 Polarising Microscope. This is an old Russian Federation Microscope – solidly made with rotating stage, crossed and plain polarising filters, and (in Andy’s model May 2018) an LED-modification to the built-in illuminator.

Plain vs Crossed Polarisation various samples LOMO Polam P-113 Microscope

Comparing plain vs crossed polarisation for various samples – all x3.5 magnification as currently this is only objective I have for this microscope – uses special clamp mechanism so my other objectives won’t fit.

For more information on the LOMO Polam P-113 Polarising Microscope, see a wide range of posts at: http://roslistonastronomy.uk/category/microscopy/equipment-for-microscopy/lomo-polam-p-113-microscope

Andy

Permian-floodplain-deposit-Robledo-New-Mexico-LOMO-Polam-P113-Crossed-Polars-120518: Excellent birefringement is shown here, and this can be seen varying between the images as polarised filter rotated (below).

Laminated-mudstone-LOMO-Polam-x3-5-plane-polar-120518: Some birefringence evident where crystals form in both images, more so in bottom as the two polarised filters approach 90 degrees orientation to each other (below).

Fossilised-palm-tree-LOMO-Polam-x3-5-plain-polar-120518: Even here some crystal deposition is evident, as shown by coloured areas of birefringence, more evident in second image where polars are crossed (below).

Observing commercial slide of Hydra spp. through crossed polarisation filters on LOMO Polam P-113 Polarising Microscope

I had a go today at observing a commercial slide of Hydra spp. through crossed polarisation filters on LOMO Polam P-113 Polarising Microscope. The first picture shows the slide with plain polarisation (effectively bright field). The second is where the one filter is rotated nearly 90 degrees. Initially, I thought the bright dots were some birefringence (small bright dots) from the mountant used on the slide, but now I think they are hot pixels on the camera! The specimen interesting becomes nearly invisible – in fact if I rotated to 90 degrees exactly, it did become invisible – this is a little short of that so that you can see specimen in background. Much longer exposure required.

Andy