Cupric sulfate crystals in mixed illumination

Marek Mis · Post by **Marek Mis** » Sun Sep 04, 2011 12:58 pm

Polarized light with retarders and oblique illumination

Lumipan - CZJ microscope
10 X S planapo Olympus
NFK 2,5 X

Ecki · Post by **Ecki** » Sun Sep 04, 2011 1:34 pm

Chapeau!

Marek, I have never seen oblique polarized light before! Very nice 3-dimensional!

regards
Ecki

Pau · Post by **Pau** » Sun Sep 04, 2011 1:58 pm

Very beautiful effect!

RogelioMoreno · Post by **RogelioMoreno** » Sun Sep 04, 2011 2:03 pm

Amazing effect!

Rogelio

Cactusdave · Post by **Cactusdave** » Sun Sep 04, 2011 2:22 pm

Fascinating effect, I will have to try that out.

Starshade · Post by **Starshade** » Sun Sep 04, 2011 2:27 pm

Fantastic! Like autumn leaves

Mitch640 · Post by **Mitch640** » Sun Sep 04, 2011 3:29 pm

Beautiful, I was thinking Poinsettias.

bromodomain · Post by **bromodomain** » Mon Sep 05, 2011 3:58 am

Excellent illumination combination and superb crystals

I have been experimenting with the lid of a petri dish as a compensator and I noticed an interesting effect. Imagine 90° crossed polars and you introduce a petri dish wall piece shaped like an oblique filter.

Essentially like that:
______
)_____|

As I translated the new element at first I got very strong oblique-like effect when the compensator plate was not fully inserted. One end of the field was still at crossed polars whereas the other was shining bright and colourful

Appart from a basic differential contrast I achieved wavelength gradient which again produced differential contrast but this time much more colourful.

All that you need to add to your polarising microscope is a petri dish

Is it ok if I post such pics here or would you prefer that I to make my own thread?

Jan l'Amie · Post by **Jan l'Amie** » Mon Sep 05, 2011 6:29 am

Very nice picture. How do you create the oblique light ?

rjlittlefield · Post by **rjlittlefield** » Mon Sep 05, 2011 7:23 am

bromodomain wrote:Is it ok if I post such pics here or would you prefer that I to make my own thread?

Admin prefers a new thread. It makes things a little easier to find later if the main author and a descriptive title are listed when Search returns its results.

--Rik

arturoag75 · Post by **arturoag75** » Mon Sep 05, 2011 7:27 am

Excellent

Arturo

Marek Mis · Post by **Marek Mis** » Mon Sep 05, 2011 9:10 am

Hello,

Thank you all for your very nice comments

Jan,
I create my oblique illumination by sliding to the side (off the center) the whole diaphragm on the base of the microscope under the condenser. In my old microscope (Lumipan) the condenser doesn't have its own diaphragm. It there is on the top of the base of the microscope instead to be integrated with the condenser (which is pancratic one). Sincerely I would prefer the ordinary solution of the way of the illumination but in this particular case it works quite good.

Bromodomain,
I think the Rik suggestion if about your post is right. It will be much better if you give us your new post instead of inserting it to mine one.

Regards

Marek

Jan l'Amie · Post by **Jan l'Amie** » Mon Sep 05, 2011 10:03 am

O.k., I slide the filter under the condensor a little out off the centre or for more oblique effect I place the home-made Kreutz filter under the condensor.