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Inexpensive dark field adapter

 
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dmillard



Joined: 24 Oct 2006
Posts: 539
Location: Austin, Texas

PostPosted: Thu Dec 28, 2017 12:48 pm    Post subject: Inexpensive dark field adapter Reply with quote

A quick and easy “dark field” adapter made from a solar cigarette lighter, readily available on eBay for just a few dollars (see for example here).

I removed the metal coil, and cut a plastic vial to reach the position at which the end of the cigarette would rest in the coil (the focus of the parabola). I stuck a small piece of black flocking material on the inside of the lighter, and glued a disc magnet on the convex base to provide a level support (a washer would work as well).

The image of the seed was taken with this setup using a combination of incident and dark field illumination.




Castilleja sp., Mitutoyo 7.5X M Plan Apo, NEX 7
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Ken Ramos



Joined: 27 Jul 2006
Posts: 7076
Location: lat=35.4005&lon=-81.9841

PostPosted: Thu Dec 28, 2017 3:56 pm    Post subject: Reply with quote

Well how do you like that! Reminds me of an ascomycete, a morel.
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ChrisR
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Joined: 14 Mar 2009
Posts: 7957
Location: Near London, UK

PostPosted: Thu Dec 28, 2017 3:58 pm    Post subject: Reply with quote

Ingenious Smile. Now with a ring flash...
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Chris R
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Pau
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Joined: 20 Jan 2010
Posts: 4543
Location: Valencia, Spain

PostPosted: Thu Dec 28, 2017 4:47 pm    Post subject: Reply with quote

Nice and effective!
How do you illuminate the mirror?, maybe with a ring of light from the rear of the subject (what's called a Lieberkühn reflector)?
http://www.alanwood.net/photography/olympus/lieberkuhn-reflectors.html
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Pau
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JH



Joined: 09 Mar 2013
Posts: 1175
Location: Vallentuna, Stockholm, Sweden

PostPosted: Thu Dec 28, 2017 5:03 pm    Post subject: Reply with quote

Hi
Nice picture and thanks for the idea!

I like the black background. Did you get it this black when photographing, or was it necessary to darken it in post processing?

Best regards
Jörgen Hellberg
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Jörgen Hellberg, my webbsite www.hphoto.se
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dmillard



Joined: 24 Oct 2006
Posts: 539
Location: Austin, Texas

PostPosted: Fri Dec 29, 2017 8:26 am    Post subject: Reply with quote

Pau wrote:
Nice and effective!
How do you illuminate the mirror?, maybe with a ring of light from the rear of the subject (what's called a Lieberkühn reflector)?


Thanks Pau. I used a pair of Novoflex Macrolight Plus lights, with Vivitar 183 flashes. See here

JH wrote:
Nice picture and thanks for the idea!
I like the black background. Did you get it this black when photographing, or was it necessary to darken it in post processing?


Thanks Jörgen. The black disc resting in the concavity is cut from an extremely light-absorbent material, Doodlebug Design Beetle Black Crushed Velvet Cardstock, see here and here , so apart from retouching around the immediate edge of the seed, there was no need to darken the background.
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Chris S.
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Joined: 05 Apr 2009
Posts: 3070
Location: Ohio, USA

PostPosted: Sat Dec 30, 2017 12:40 am    Post subject: Reply with quote

Very good and useful post, David! Very Happy

Ken Ramos wrote:
Reminds me of an ascomycete, a morel.

This is precisely what I thought. Do we both have morchellaceae on the brain?

--Chris S.
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JH



Joined: 09 Mar 2013
Posts: 1175
Location: Vallentuna, Stockholm, Sweden

PostPosted: Sun Dec 31, 2017 10:08 am    Post subject: Reply with quote

dmillard wrote:


JH wrote:
Nice picture and thanks for the idea!
I like the black background. Did you get it this black when photographing, or was it necessary to darken it in post processing?


Thanks Jörgen. The black disc resting in the concavity is cut from an extremely light-absorbent material, Doodlebug Design Beetle Black Crushed Velvet Cardstock, see here and here , so apart from retouching around the immediate edge of the seed, there was no need to darken the background.



Thank you very much for that information.
Best regards
Jörgen Hellberg
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Jörgen Hellberg, my webbsite www.hphoto.se
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cube-tube



Joined: 10 Oct 2017
Posts: 67
Location: Durham, NC

PostPosted: Fri Jan 05, 2018 7:47 pm    Post subject: Reply with quote

Bought!
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