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Vincent Bourgoin's Mindat Home Page

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Vincent Bourgoin's Mindat Home Page

Registered member since 29th Apr 2009

Vincent Bourgoin has uploaded:
724 Mineral Photos
1 Locality Photo
4 Other Photos
 
Born in 1984, I live in Paris and collect insects and minerals since I am little. I seriously collecting minerals since 2002. I'm looking specifically for rare species and aesthetic specimens (both at once, ideally).
My collection has a little over 3.000 mineral species in 10.000 boxes. My sizes of boxes are 28x28x22 classic box micromounts but I prefer thumbnails and small cabinets, I have boxes to 80x80x35.
Since 2002, I am a member of the French Association of Micromineralogy (AFM > http://www.micromineral.org/ ) and vice-president since 2007. On this occasion, I had the chance to meet Georges Favreau who taught me a lot, and hopefully, teach me much longer !
In late 2008, I created with Dr. Jean-Claude Boulliard, director of the mineralogy collection of the Pierre and Marie Curie University in Paris, the Jean Wyart association, in order to use the equipment of the Institute of Mineralogy and Physics of Condensed background (IMPMC) to make scientific studies to analyze minerals.
Since 2009, we made more than 5000 analyses mostly with a SEM Zeiss Ultra 55 (with an Ionic column Gemini allows me to take SEM pictures of incredible quality), Castaing microprobe, PANalatycal diffractometer and a single-crystal diffractometer Oxford Diffraction.

For my optical photos, I use my stereomicroscope. It's a Nikon SMZ 1500 (0.75x to 11.25x zoom) with the three Nikon Apo HR objectives (0.5 x, 1x, 1.6x) on a turret, which allows me to put the objectives in the optical axis for the photos (minimum 0.78 mm FOV with 1.6x and coaxial (1.5 x)). For the light, I use three sources of 250 W, of which two can go to a coaxial illuminator allows me episcopic light, an annular ring Schott KL2500 LCD for the 1x objective.
I use an elevator (Sigma Koki) with a step graded in micron (Mitutoyo). I calculated all my depth of field for photo at all possible magnifications of my stereomicroscope.
Behind the photo output, I placed a Canon EOS 7D and take pictures in RAW and silent 2 mode with the Live View.
Then I process the photos with Helicon Focus and Light Room for the latest fine settings.



Since February 2011, I became a Mitutoyo M Plan Apo 10x objective (WD 33.5 mm, NA 0.28). I installed it on my turret (minimum FOV with the coaxial 0.3 mm). However, at this magnification, I come to the limit of resolution of my optical system. Quality of photos remains relatively good up to 0.5 mm FOV. However, the depth of field is tremendously reduced with this objective (of the order of 1 micron) and light diffusion is very annoying.

Since November 2012, I became a Mitutoyo M Plan Apo 20x objective (WD 20 mm, NA 0.42). I installed it on my turret (minimum FOV with the coaxial 0.15 mm). The difference with the Mitutoyo 10x is very amazing which is probably due to its higher numerical aperture. Quality of photos remains relatively good up to 0.25 mm FOV.

 

 
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