Sodium tartrate crystals

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Lomonaut
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Joined: Sat Jan 27, 2018 5:30 pm

Sodium tartrate crystals

#1 Post by Lomonaut » Sun Sep 05, 2021 10:42 pm

Just a quick session to test my improvised Optiphot + enlarger & camera setup. A work in progress...

Nikon E-plan 10x/0.25, pol, 50 mm enlarger objective used as a relay lens for a M4/3 sensor.
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sodiumtatrate_10x_06b.jpg
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sodiumtatrate_10x_04b.jpg
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smollerthings
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Re: Sodium tartrate crystals

#2 Post by smollerthings » Mon Sep 06, 2021 6:15 pm

Waouh, those pics are gorgeous! Those pics are very "organic" looking, feather like...

What kind of light do you shine on your sample? How do filters change the colors?

Lomonaut
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Joined: Sat Jan 27, 2018 5:30 pm

Re: Sodium tartrate crystals

#3 Post by Lomonaut » Tue Sep 07, 2021 10:57 pm

Thanks!

What kind of light - eh, 50W halogen.
These are birefringent crystals between polarisation filters, which produces interference colors. The third picture has a 'retardation plate' above the polarizer. Very easy to DIY and cheap as long as it's not for accurate measurements! I think Microbehunter made a video about it.

Javier
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Re: Sodium tartrate crystals

#4 Post by Javier » Wed Sep 08, 2021 12:35 am

That is so beautiful, thanks for sharing!

The views through the eyepiece must be breathtaking.

Lomonaut
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Re: Sodium tartrate crystals

#5 Post by Lomonaut » Wed Sep 08, 2021 7:33 pm

Tnx, yes the view is spectacular with those Nikon ultrawide eyepieces!
Very finnicky though. If I look at the periphery, the view becomes black because the pupils move away from the light cone and I have to compensate by moving my head a bit. Is that normal?

Here's another one, an area overlapping the third picture. I even stitched them, so easy! Next session I'll go for a 3x3 stitch.
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sodiumtatrate_10x_03b.jpg
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smollerthings
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Re: Sodium tartrate crystals

#6 Post by smollerthings » Wed Sep 08, 2021 7:53 pm

Lomonaut wrote:
Tue Sep 07, 2021 10:57 pm
Thanks!

What kind of light - eh, 50W halogen.
These are birefringent crystals between polarisation filters, which produces interference colors. The third picture has a 'retardation plate' above the polarizer. Very easy to DIY and cheap as long as it's not for accurate measurements! I think Microbehunter made a video about it.
Yes I know that the cristals change polarization which lead to interference colors. But aren't those colors part of the original light spectrum? I was just wondering what would happen if one would filter the original light? Would one be able to produce another color palette?

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75RR
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Re: Sodium tartrate crystals

#7 Post by 75RR » Wed Sep 08, 2021 8:23 pm

.
Delightful images, well done. Nice and sharp too!
Nikon E-plan 10x/0.25, pol, 50 mm enlarger objective used as a relay lens for a M4/3 sensor.
Do you have a photo of your setup?
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)

Lomonaut
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Joined: Sat Jan 27, 2018 5:30 pm

Re: Sodium tartrate crystals

#8 Post by Lomonaut » Wed Sep 08, 2021 9:04 pm

smollerthings wrote:
Wed Sep 08, 2021 7:53 pm
Yes I know that the cristals change polarization which lead to interference colors. But aren't those colors part of the original light spectrum? I was just wondering what would happen if one would filter the original light? Would one be able to produce another color palette?
Ah, I misunderstood, sorry! Interesting question.

I think you are right, the colors are part of the original light spectrum and the POL effect can not actually change or shift the light frequencies. The spectrum can appear because the light is white. Just to be sure I'll try it out if I can find some filters ;)

Thanks 75RR, the camera was just lying loose on the wobbly enlarger!

Lomonaut
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Joined: Sat Jan 27, 2018 5:30 pm

Re: Sodium tartrate crystals

#9 Post by Lomonaut » Sun Oct 17, 2021 10:37 pm

Small update... this shot deserves to be here, too!
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Hobbyst46
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Re: Sodium tartrate crystals

#10 Post by Hobbyst46 » Mon Oct 18, 2021 12:46 pm

Spectacular images. Bravo !

Francisco
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Re: Sodium tartrate crystals

#11 Post by Francisco » Tue Oct 19, 2021 10:44 am

Very nice.

Javier
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Location: Buenos Aires, Argentina.

Re: Sodium tartrate crystals

#12 Post by Javier » Wed Oct 20, 2021 1:09 pm

That is very beautiful!

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