Illumination comparison!

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Gasman
Posts: 94
Joined: Sat Jan 09, 2016 1:36 pm
Location: North East UK

Illumination comparison!

#1 Post by Gasman » Sat Oct 17, 2020 7:28 pm

Hi
Menthol + Malic acid under different illumination

Pseudo-DIC
menthmalicpseudodic1.jpg
menthmalicpseudodic1.jpg (40.84 KiB) Viewed 428 times

Pseudo + Pol
menthmalicpsuedopol1.jpg
menthmalicpsuedopol1.jpg (43.63 KiB) Viewed 428 times
Pol + retarder
menthmalicpol+ret1.jpg
menthmalicpol+ret1.jpg (45.04 KiB) Viewed 428 times
Steve

PeteM
Posts: 1253
Joined: Tue Dec 06, 2016 6:22 am
Location: N. California

Re: Illumination comparison!

#2 Post by PeteM » Sat Oct 17, 2020 8:17 pm

Great examples. I'm tempted to say even the third is "not retarded at all . . ."

FWIW, an Ebay seller has recently been offering very affordable quarter wave plates laminated between (usually) acrylic and sometimes glass.

hans
Posts: 355
Joined: Thu May 28, 2020 11:10 pm
Location: Southern California

Re: Illumination comparison!

#3 Post by hans » Sat Oct 17, 2020 8:34 pm

PeteM wrote:
Sat Oct 17, 2020 8:17 pm
FWIW, an Ebay seller has recently been offering very affordable quarter wave plates laminated between (usually) acrylic and sometimes glass.
Do you know of any affordable sources for full-wave plates?

PeteM
Posts: 1253
Joined: Tue Dec 06, 2016 6:22 am
Location: N. California

Re: Illumination comparison!

#4 Post by PeteM » Sat Oct 17, 2020 9:46 pm

Same source (optitec2020) might have them?

https://www.ebay.com/sch/optitec2020/m. ... 7675.l2562

Gasman
Posts: 94
Joined: Sat Jan 09, 2016 1:36 pm
Location: North East UK

Re: Illumination comparison!

#5 Post by Gasman » Sat Oct 17, 2020 9:48 pm

Would be interesting to compare a ‘proper’ wave plate with homemade retarders, anyone done a comparison?

Steve

hans
Posts: 355
Joined: Thu May 28, 2020 11:10 pm
Location: Southern California

Re: Illumination comparison!

#6 Post by hans » Sat Oct 17, 2020 10:03 pm

PeteM wrote:
Sat Oct 17, 2020 9:46 pm
Same source (optitec2020) might have them?
Not really clear to me what they are selling, I guess "lambda" alone should imply full-wave? But some of the "Wave Plate Retarder Lambda" listings say quarter-wave in the actual listing text, others don't specify.
Gasman wrote:
Sat Oct 17, 2020 9:48 pm
Would be interesting to compare a ‘proper’ wave plate with homemade retarders, anyone done a comparison?
What are people typically using for homemade retarders? I finally found a reasonable deal on an AO/Reichert 1153 polarizer with swing-out full-wave plate but just got it cleaned up a few days ago and have not used it much yet.

PeteM
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Joined: Tue Dec 06, 2016 6:22 am
Location: N. California

Re: Illumination comparison!

#7 Post by PeteM » Sun Oct 18, 2020 12:51 am

Seems there are four main options for less-than-new-OEM prices: 1) make your own with layers of stretched plastic; 2) something a step up like those Ebay listings; 3) used plates off Ebay - often still pricey; 4) occasionally-available items from optical surplus places.

BramHuntingNematodes
Posts: 510
Joined: Tue Jan 21, 2020 1:29 am
Location: Georgia, USA

Re: Illumination comparison!

#8 Post by BramHuntingNematodes » Sun Oct 18, 2020 1:28 am

Yeah you can get quarter and half wave film cheap from edmunds. A little norland between two watch glasses works well.
1942 Bausch and Lomb Series T Dynoptic, Custom Illumination

Javier
Posts: 62
Joined: Tue May 09, 2017 11:19 am
Location: Buenos Aires, Argentina

Re: Illumination comparison!

#9 Post by Javier » Mon Oct 19, 2020 12:14 am

Very interesting images, thanks for sharing!

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