MicrobeHunter.com Microscopy Forum

You can also access this page with: www.microscopy-forum.com
It is currently Mon Aug 19, 2019 4:23 pm

All times are UTC




Post new topic  Reply to topic  [ 7 posts ] 
Author Message
 Post subject: DIC Prisms
PostPosted: Wed Jul 17, 2019 4:53 am 
Offline

Joined: Wed Mar 27, 2019 6:39 am
Posts: 48
Hi,

Why are Edmund Optics and Thorlabs only offering Wollaston polarizers for DIC, and it is so hard to find Nomarski prisms? Are they actually selling Nomarski, but using Wollaston as the more general term?

Is it a manufacturing issue? Or are Wallaston less sensitive to the objective type so considered easier to set up? Olympus used to sell a DIC Nomarski prism in an adapter for BH microscopes, that was not the turret type that matched the objective magnification. Did that single prism adapter have magnification range limits? Otherwise there are the turret prisms: 20x, 40x, 80x prisms and the ULWD models. If I wanted to use Edmund Optics, would different ones need to be used for different magnifications?

Thanks.

https://www.edmundoptics.com/f/wollasto ... ers/14173/
https://www.thorlabs.com/newgrouppage9. ... oup_id=917


Reference on Nomarski:

https://en.wikipedia.org/wiki/Nomarski_prism


Top
   
 Post subject: Re: DIC Prisms
PostPosted: Wed Jul 17, 2019 6:41 am 
Offline
User avatar

Joined: Sun Oct 12, 2014 2:34 am
Posts: 5929
Location: Estepona
Do not think those Wollaston Polarizers are for DIC. I believe they have another use.

https://en.wikipedia.org/wiki/Wollaston_prism

https://en.wikipedia.org/wiki/Nomarski_prism

_________________
Zeiss Standard WL on sick leave, Standard 18 & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)


Top
   
 Post subject: Re: DIC Prisms
PostPosted: Wed Jul 17, 2019 7:07 am 
Offline

Joined: Mon Apr 10, 2017 8:24 am
Posts: 1331
Location: NorthWest England
Sorry, Bob: I cannot answer your question
But, thank you for that Wikipedia link, which in turn linked to this page
https://micro.magnet.fsu.edu/primer/java/dic/wollastonwavefronts/
with its excellent tutorial ... that has improved my understanding.

MichaelG.

_________________
Too many 'projects'


Top
   
 Post subject: Re: DIC Prisms
PostPosted: Wed Jul 17, 2019 7:28 am 
Offline

Joined: Wed Mar 27, 2019 6:39 am
Posts: 48
This video gives the part list for a modular microscope with DIC. But it didn't give the Nomarski prism part numbers. So I wrote them and they say that the Wollaston optics mentioned in the original post are for the DIC.

Here's the video link:
https://www.youtube.com/watch?v=Qn1qj5qoMiI


Top
   
 Post subject: Re: DIC Prisms
PostPosted: Wed Jul 17, 2019 8:36 am 
Offline
User avatar

Joined: Sun Oct 12, 2014 2:34 am
Posts: 5929
Location: Estepona
Quote:
I wonder how much "considerably less" is, given that a finite DIC system from the big 4 can be had for $3000 off the shelf viewtopic.php?f=16&t=7611#p67234 and less if one is patient enough to put one together from used parts.

_________________
Zeiss Standard WL on sick leave, Standard 18 & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)


Top
   
 Post subject: Re: DIC Prisms
PostPosted: Wed Jul 17, 2019 12:35 pm 
Offline

Joined: Fri May 15, 2015 12:15 am
Posts: 2639
Correct you are. Companies like to overemphasize the value of their products. For the tinkerer, the supply of PZO systems seem to continue; some N.O.S.
Padding the price of an off the shelf DIC microscope out to $30, $40,000 is true, if one includes multiple high end objectives but for a straightforward glorified shop mic. such as the one pictured with one objective, it is a bit like comparing a mule to a to a triple crown contestant.


Top
   
 Post subject: Re: DIC Prisms
PostPosted: Wed Jul 17, 2019 2:40 pm 
Offline

Joined: Tue Apr 16, 2019 2:07 am
Posts: 135
Location: Oregon, USA
MichaelG. wrote:


Thank you for this link. Very helpful. I wonder how prisms are glued together without causing optical aberrations from the adhesive. Or maybe it's a nonissue?

Heather


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 7 posts ] 

All times are UTC


Who is online

Users browsing this forum: ImperatorRex and 6 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited