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Nikon Microphot. DIC Sénarmont
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fpelectronica



Joined: 19 Feb 2010
Posts: 1804
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PostPosted: Sat Apr 28, 2018 11:40 am    Post subject: Nikon Microphot. DIC Sénarmont Reply with quote

I recently purchased a Nikon Microphot microscope equipped with Sénarmont DIC. This system is different from the PZO that it used.
I have done some tests. I appreciate comments, advice and criticisms that help me use it correctly. Thank you
Francisco
P.S.
Both the photographs and the videos are unedited or retouched




Video:
https://youtu.be/6LWn7b7syd8



Video:
https://youtu.be/p52jXIsj6CA
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rjlittlefield
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PostPosted: Sat Apr 28, 2018 12:50 pm    Post subject: Re: Nikon Microphot. DIC Sénarmont Reply with quote

fpelectronica wrote:
Both the photographs and the videos are unedited or retouched

I am confused. The still images posted inline are only 227 × 173 pixels, including the black bevel border. Are the images really that small and bordered coming out of the camera?

--Rik
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Ichthyophthirius



Joined: 07 Mar 2013
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PostPosted: Sat Apr 28, 2018 1:56 pm    Post subject: Reply with quote

Hi Francisco,

Looks OK. There will be differences depending on the type of objectives you use. Do you use immersion for the condenser (assuming it is NA 1.35 or 1.4)?

Have you tried playing around with the contrast levels (rotating the polariser) or do you always work at maximum contrast level?

Regards, Ichty
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fpelectronica



Joined: 19 Feb 2010
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PostPosted: Sun Apr 29, 2018 2:36 am    Post subject: Re: Nikon Microphot. DIC Sénarmont Reply with quote

rjlittlefield wrote:
fpelectronica wrote:
Both the photographs and the videos are unedited or retouched

I am confused. The still images posted inline are only 227 × 173 pixels, including the black bevel border. Are the images really that small and bordered coming out of the camera?

--Rik

The photographs have been resized to be published in the forum because it only supports 150K (I think)
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fpelectronica



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PostPosted: Sun Apr 29, 2018 2:47 am    Post subject: Reply with quote

Ichthyophthirius wrote:
Hi Francisco,

Looks OK. There will be differences depending on the type of objectives you use. Do you use immersion for the condenser (assuming it is NA 1.35 or 1.4)?

Have you tried playing around with the contrast levels (rotating the polariser) or do you always work at maximum contrast level?

Regards, Ichty


Thanks for your answer.
The condenser is from NA 1.4. I have used the objective Nikon Plan Apo20X.
I used the rotation of the polarizer to obtain different contrast. With crossed polarizers the image is very dark (almost dark field).
I'm trying to make a compensator to try to achieve DIC colors.
With this system the turning of the polarized only gives me "gray scale", not colors. In the PZO system, the displacement of the prism gives me colors.
Regards
Francisco
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Cactusdave



Joined: 09 Jun 2009
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PostPosted: Sun Apr 29, 2018 6:26 am    Post subject: Reply with quote

As far as image size is concerned you can post much larger photos on the forum than your two samples.

Quote:
First, make sure that your image dimensions are 1024 pixels or smaller, on both axes, AND that the image file length is 300 KB or smaller. Use your favorite photo editor to resize the image and set the JPEG compression quality as needed to meet those two rules.


http://www.photomacrography.net/forum/viewtopic.php?p=10#10

As far is DIC is concerned your DIC looks good, especially in the first video. I can't remember the exact implementation of DIC on the Microphot, but on the Diaphot DIC implementation, there is a lever on the condenser which switches in or out a red/magenta compensator plate. With this inserted, rotation of the Nomarski prism adjustment produces all the colour spectrum of 'colour DIC'. Inserting a retarder after the DIC polariser and before the specimen and objective should have the same effect. Layers of Sellotape and various plastic and cellophane sheets all make good retarders for this application as they do in ordinary polarised illumination. I have used this method to get 'colour DIC' with the Zeiss DIC implementation which lacks a built in lambda/compensator plate
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JohnyM



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PostPosted: Sun Apr 29, 2018 8:00 am    Post subject: Reply with quote

If color is all you looking for, just push in/out a little bit the top DIC prism OR turn condenser disc with compnensators a little.
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fpelectronica



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PostPosted: Sun Apr 29, 2018 8:09 am    Post subject: Reply with quote

JohnyM wrote:
If color is all you looking for, just push in/out a little bit the top DIC prism OR turn condenser disc with compnensators a little.


Thank you. Yes, I have tried it and I get "DIC colors" but, in my opinion, there is a notable loss in the definition of the image
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JohnyM



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PostPosted: Sun Apr 29, 2018 8:32 am    Post subject: Reply with quote

If you tilt too much, you're obsuring your aperture. Push one of sliders JUST a little bit, then turn De Senramont.
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fpelectronica



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PostPosted: Sun Apr 29, 2018 9:06 am    Post subject: Reply with quote

JohnyM wrote:
If you tilt too much, you're obsuring your aperture. Push one of sliders JUST a little bit, then turn De Senramont.

Ok.
Thanks
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JohnyM



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PostPosted: Sun Apr 29, 2018 10:08 am    Post subject: Reply with quote

Also could you take a picture of your microphot? I have/had 3 different DIC sets for it, so i could give you some pointers. The one im using mainly is with Universal System condenser and objective dedicated sliders.
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fpelectronica



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PostPosted: Sun Apr 29, 2018 10:18 am    Post subject: Reply with quote

Cactusdave wrote:
As far as image size is concerned you can post much larger photos on the forum than your two samples.

Quote:
First, make sure that your image dimensions are 1024 pixels or smaller, on both axes, AND that the image file length is 300 KB or smaller. Use your favorite photo editor to resize the image and set the JPEG compression quality as needed to meet those two rules.


http://www.photomacrography.net/forum/viewtopic.php?p=10#10

As far is DIC is concerned your DIC looks good, especially in the first video. I can't remember the exact implementation of DIC on the Microphot, but on the Diaphot DIC implementation, there is a lever on the condenser which switches in or out a red/magenta compensator plate. With this inserted, rotation of the Nomarski prism adjustment produces all the colour spectrum of 'colour DIC'. Inserting a retarder after the DIC polariser and before the specimen and objective should have the same effect. Layers of Sellotape and various plastic and cellophane sheets all make good retarders for this application as they do in ordinary polarised illumination. I have used this method to get 'colour DIC' with the Zeiss DIC implementation which lacks a built in lambda/compensator plate


Thanks for the comment and advice.
regards
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fpelectronica



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PostPosted: Sun Apr 29, 2018 10:33 am    Post subject: Reply with quote

JohnyM wrote:
Also could you take a picture of your microphot? I have/had 3 different DIC sets for it, so i could give you some pointers. The one im using mainly is with Universal System condenser and objective dedicated sliders.


Thank you.
Photographs of the protaobjectives and condenser





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JohnyM



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PostPosted: Sun Apr 29, 2018 1:39 pm    Post subject: Reply with quote

Modified EPI FL-3?
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fpelectronica



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PostPosted: Sun Apr 29, 2018 1:56 pm    Post subject: Reply with quote

JohnyM wrote:
Modified EPI FL-3?


Not modified It is the original
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