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A general guide for using the Forum with some rules and tips
The micro photographs of Christian Rewitzer
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Jordi Fabre
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PostPosted: Nov 21, 2008 18:00    Post subject: The micro photographs of Christian Rewitzer  

Christian Rewitzer, kindly, wrote a text explaining their "tricks" to do photographs of micro specimens.

As if someone does not know him, Christian is German, he is exhibitor in Munich Show and in other German Fairs, and have an enormous reputation for the quality of his photographs micro. You can see a gallery with their images in Mindat: http://www.mindat.org/gallery-5825.html.

Thanks Christian to be so kind to share with us your knowledge!

Equipment

Microscope

I use a Carl Zeiss Discovery.V20 microscope with a motor-driven focus and zoom adjustment that can be remote-controlled by a personal computer. This is a real advantage by taking z-stack photos, as I will explain later.

With several objectives on a revolver one can vary the field of view additionally to the zoom. However, my preferred “dark field” illumination cannot be combined with all objectives at the same time for geometric reasons.

Therefore I prefer the PlanApo 1,5 objective which allows a FOV of app 1,5 mm as a minimum. All smaller objects cannot be further resolved with optical equipment, because physics have their limitations there.

More informations: http://www.zeiss.de/mikro

Illumination

Very important for a good picture is a good illumination. Lots of light from all sides have two main disadvantages: You get infinite annoying reflexes and no 3D effect. For getting a 3D effect, you need shadow. Light coming nearly horizontal achieves best 3D-effects, what a view outside an aircraft during sunrise or sunset always shows very impressively. At microphotographics You can combine the necessary with the useful measure.

Lamps generate not only light, but also heat. Heat is not so recommendable especially for samples with embedded crystal water. They might be destroyed by that quickly. The solution is a cold light source. A halogen bulb generates light, which is transported via glass fiber optics to the objekt. Heat and light are dislocated by that.

I use a light source MC 1500 from Schott.
http://www.polytec.com/ger/_files/VisiLEDs_Uebersicht.pdf

Camera

A primary requirement when choosing a camera is the compatibilty with a photo tubus adaption. Manufacturers of scopes serve a certain number of available cameras on the market. SLR cameras have a bigger imager and more pixels. However the preview of the final picture is only available at consumer cameras. Aditionnally some consumer cameras offer a display to swing out with tilt and swivel ability, which is a big ergonomic advantage in sitting position.

Using compact-cameras with a zoom, a full scale picture should be feasible in the range of the optical zoom. If You must shift into the digital zoom for having a vignetting free picture you loose a lot of resolution.

The maximum resolution of an objective calculates as follows:

d: distance between two points
λ: wavelength of light
A: numeric aperture of the objective

The wavelength of visible light is in the range of 400-700 nm. Green light has app. 500 nm. The numeric aperture of best objectives with a reasonable free working distance of app 30 mm are in the area of 0,25. Thus the minimum distance between two points, which can be resolved is app. 1 µm.

A FOV of 1 mm, achieved with a 5 Mpixel camera, has a pixel distance of app 1/2500 mm or 0,4 µm. This shows, that a further increase of the number of pixels above 5 Mpixels doesn’t achieve higher resolution in the highest magnification area.

Actually I´m using a Canon Power shot A620 but for many other cameras are adapters available.

Digital postprocessing

The most important improvement since i do my photos digitally came for me with the z-stack technology. The depth of field is defined by the Abbe-formula. Even if one takes best optical equipment available it doesn’t change the fact, that for displaying minerals the depth of field is by far not sufficient. At a FOV of 3 mm my scope has a depth of field of 0,08 mm. That means I need at least 12 layers to display a cube of 1 mm side length sharply from bottom to top. This is the reason, why most of all microphotographs are not really sharp in wide areas.

A remedy offers only the z-stack technology. The focus of one frame is changed incrementally in z-axis. The increment depends on the size of the frame, I choose normally the half depth of view, see table xy. There is the digital display of the z-axis and the ability of controlling that remote very helpful. Depending on the topology of the probe I need between ten and thirty layers. Those are merged afterwards by special software.

Beside the own software of the big scope manufacturers there are several third-party-solutions on the market. I actually work with helicon focus.

Next is (moderate!) sharpening. A single optimization of each picture is necessary. It is amazing what an improvement from sharpening results.

I continue with the colour correction. Although the white balance is done correctly and colour temperature of the light source was kept constantly the colours of the picture and the colours of the original normally are not equivalent. With my camera I get a little bit too much red, so yellow probes appear to be orange. This is a systematic fault and can be compensated generally.

The whole workflow until I get the final result for one picture takes app half an hour.



Microscope Carl Zeiss.jpg
 Description:
The microscope Carl Zeiss Discovery.V20 mentioned for Christian.
 Viewed:  63027 Time(s)

Microscope Carl Zeiss.jpg



Anatase from Adra, Almeria, Spain.jpg
 Description:
One of the excelent photos of Christian Rewitzer. An Anatase from Adra, Almería, Spain.
 Viewed:  63044 Time(s)

Anatase from Adra, Almeria, Spain.jpg


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PostPosted: Nov 23, 2008 15:53    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

Christian told to me that if anybody needs help or wants to discuss with him topics related with micro photographs, he can contact with him via eMail: C.Rewitzer(at)web.de

Also, next days he will send to me some unpublished photos. As soon as I get them I will publish them here.

Really kind Christian, thanks a lot!

Jordi
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PostPosted: Nov 23, 2008 16:31    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

Beautiful work. I look forward to seeing more of his photographs.
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PostPosted: Nov 24, 2008 17:53    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

First batch of unpublished photos from Christian Rewitzer. Most Spanish minerals.
Again, thanks Christian!



Copper-El-Horcajo, Ciudad Real.jpg
 Description:
Copper - El Horcajo, Ciudad Real, Spain.
Field of view:1.6 mm
 Viewed:  62826 Time(s)

Copper-El-Horcajo, Ciudad Real.jpg



Cerussite2 Las Ninas, Rodalquilar.jpg
 Description:
Cerussite - Las Niñas Mine, Rodalquilar, Almería, Spain.
Field of view:3 mm
 Viewed:  62813 Time(s)

Cerussite2 Las Ninas, Rodalquilar.jpg



Campylit-Cerro-de-los-Guardias,Rodalquilar.jpg
 Description:
Mimetite (Campyllte) - Cerro de los Guardias, Rodalquilar, Almería, Spain.
Field of view:1.8 mm
 Viewed:  62863 Time(s)

Campylit-Cerro-de-los-Guardias,Rodalquilar.jpg



Ba-Pharmakosiderite Clara Mine Germany.jpg
 Description:
Barium-pharmacosiderite - Clara Mine, Black Forest, Baden-Württemberg, Germany.
Field of view:3 mm
 Viewed:  63068 Time(s)

Ba-Pharmakosiderite Clara Mine Germany.jpg



Arthurite Chovar, Valencia.jpg
 Description:
Arturhite - Chovar, Valencia, Spain.
Field of view:1.2 mm
 Viewed:  62831 Time(s)

Arthurite Chovar, Valencia.jpg



Anglesite, Las Ninas, Rodalquilar.jpg
 Description:
Anglesite - Las Niñas Mine, Rodalquilar, Almería, Spain.
Field of view:8 mm
 Viewed:  62827 Time(s)

Anglesite, Las Ninas, Rodalquilar.jpg


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PostPosted: Nov 25, 2008 04:22    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

thank you very much Jordi and Christian,
for publishing theses nice lovable photos here.relay amazing strange photography.
ikram
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PostPosted: Nov 25, 2008 17:51    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

Second batch of unpublished photos from Christian Rewitzer. The photo of the Cetineite is terrific...

Enjoy!



Karibibite Bou Azzer, Morocco.jpg
 Description:
Karibibite from Oumlil Mine, Bou Azzer, Tazenakht, Morocco.
Field of view:3.4 mm
 Viewed:  62738 Time(s)

Karibibite Bou Azzer, Morocco.jpg



Cetineite, Cetine, italy.jpg
 Description:
Cetineite from the type locality: Le Cetine di Cotorniano Mine, Chiusdino, Siena, Italy.
Field of view:0.8 mm
 Viewed:  62758 Time(s)

Cetineite, Cetine, italy.jpg



Clinoklase Clara Mine, Germany.jpg
 Description:
Clinoclase from Clara Mine, Black Forest, Baden-Württemberg, Germany.
Field of view:2 mm
 Viewed:  62701 Time(s)

Clinoklase Clara Mine, Germany.jpg



Cinnabar Almaden, Ciudad Real.jpg
 Description:
Cinnabar from Pozo San Teodoro, Almadén, Ciudad Real, Spain.
Field of view:4.6 mm
 Viewed:  62819 Time(s)

Cinnabar Almaden, Ciudad Real.jpg



Cerussite Las Ninas, Rodalquilar.jpg
 Description:
Cerussite from Las Niñas Mine, Rodalquilar, Almería, Spain.
Field of view:3 mm
 Viewed:  62731 Time(s)

Cerussite Las Ninas, Rodalquilar.jpg


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PostPosted: Nov 25, 2008 20:03    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

Just wonderful!!! We look forward to a book.
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PostPosted: Nov 26, 2008 01:35    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

Very beautiful nice photos, congratulation Christian ,
ikram
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PostPosted: Nov 26, 2008 16:03    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

The third set of photos from Christian.

I don't know if the visitors of this Forum are enjoying the photos of Christian as I enjoy, because if so, we are the happiest forum in the world ;-)



Malachite-Cerro-de-los-Guardias, Rodalquilar.jpg
 Description:
Malachite from Cerro de los Guardias, Rodalquilar, Almería, Spain.
Field of view: 5 mm
 Viewed:  62707 Time(s)

Malachite-Cerro-de-los-Guardias, Rodalquilar.jpg



Hechtsbergite Hechtsberg, Germany.jpg
 Description:
Hechtsbergite from the type locality, the quarry Hechtsberg, Hausach, Black Forrest, Germany.
Field of view: 0.4 mm
 Viewed:  62620 Time(s)

Hechtsbergite Hechtsberg, Germany.jpg



Gold-Verespatak, Romania.jpg
 Description:
Gold from Verespatak (former name in the Austro-Hungarian empire of the current Rosia Montana, Rumania)
Field of view: 1.8 mm
 Viewed:  62706 Time(s)

Gold-Verespatak, Romania.jpg



Olivenite Cocotas, Granada.jpg
 Description:
Olivenite from Cocotas Mines, Tijola, Granada, Spain.
Field of view: 3.2 mm
 Viewed:  62653 Time(s)

Olivenite Cocotas, Granada.jpg



Diaboleite Lavrion, Greece.jpg
 Description:
Diaboleite from the classic deposit of Lavrion, Attica, Greece.
Field of view: 0.8 mm
 Viewed:  62640 Time(s)

Diaboleite Lavrion, Greece.jpg


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PostPosted: Nov 27, 2008 17:49    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

The last set, I have no more photos of Christian. I think I'm going to ask him for more, I have enjoyed so much publishing them, that now I can't pass without doing so. ;-)


Wulfenite Pinar de Bedar, Almeria.jpg
 Description:
Wulfenite from Aprovechado Mine, Pinar de Bédar, Bédar, Almería, Spain.
Field of view: 0.8 mm
 Viewed:  62551 Time(s)

Wulfenite Pinar de Bedar, Almeria.jpg



Vladimirite Bou Azzer, Morocco.jpg
 Description:
Vladimirite from Aït Ahman, Bou Azzer, Tazenakht, Morocco.
Field of view: 0.8 mm
 Viewed:  62574 Time(s)

Vladimirite Bou Azzer, Morocco.jpg



Nealite Lavrion, Greece.jpg
 Description:
Nealite from Lavrion, Attica, Greece.
Field of view: 1.2 mm
 Viewed:  62620 Time(s)

Nealite Lavrion, Greece.jpg



Pyromorphite on Descloizite Las Ninas, Rodalquilar.jpg
 Description:
Pyromorphite on Descloizite from Las Niñas Mine, Rodalquilar, Almería, Spain.
Field of view: 1.8 mm
 Viewed:  62560 Time(s)

Pyromorphite on Descloizite Las Ninas, Rodalquilar.jpg



Mixite-Pinar de Bedar, Almeria.jpg
 Description:
Mixite from Aprovechado Mine, Pinar de Bédar, Bédar, Almería, Spain.
Field of view: 2.6 mm
 Viewed:  62591 Time(s)

Mixite-Pinar de Bedar, Almeria.jpg


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PostPosted: Dec 19, 2008 18:12    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

A Christmas gift from Christian Rewitzer: seven Spanish micro-wonders.


Voltaite - Rio Tinto, Huelva, Spain.jpg
 Description:
Voltaite from Pozo Alfredo, Rio Tinto, Huelva, Spain.
Field of view: 0.8 mm
 Viewed:  62245 Time(s)

Voltaite - Rio Tinto, Huelva, Spain.jpg



Barahonaite-Fe - Pastrana, Mazarron, Murcia, Spain.jpg
 Description:
Barahonaite-Fe from Pastrana, Mazarron, Murcia, Spain.
Field of view: 0.6 mm
 Viewed:  62277 Time(s)

Barahonaite-Fe - Pastrana, Mazarron, Murcia, Spain.jpg



Barahonaite-Al - Pastrana, Mazarron, Murcia, Spain.jpg
 Description:
Barahonaite-Al from Pastrana, Mazarron, Murcia, Spain.
Field of view: 0.4 mm
 Viewed:  62253 Time(s)

Barahonaite-Al - Pastrana, Mazarron, Murcia, Spain.jpg



Milarite - Cadalso de los vidrios, Madrid, Spain.jpg
 Description:
Milarite from Cadalso de los Vidrios, Madrid, Spain.
Field of view: 1.6 mm
 Viewed:  62229 Time(s)

Milarite - Cadalso de los vidrios, Madrid, Spain.jpg



Milarite 2 - Cadalso de los vidrios, Madrid, Spain.jpg
 Description:
Milarite from Cadalso de los Vidrios, Madrid, Spain.
Field of view: 1 mm
 Viewed:  62314 Time(s)

Milarite 2 - Cadalso de los vidrios, Madrid, Spain.jpg



Calderonite - Badajoz, Spain.jpg
 Description:
Calderonite from Santa Marta, Badajoz, Spain.
Field of view: 0.8 mm
 Viewed:  62456 Time(s)

Calderonite - Badajoz, Spain.jpg



Coquimbite - Rio Tinto, Huelva, Spain.jpg
 Description:
Coquimbite from Pozo Alfredo, Rio Tinto, Huelva, Spain.
Field of view: 0.6 mm
 Viewed:  62269 Time(s)

Coquimbite - Rio Tinto, Huelva, Spain.jpg


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PostPosted: Dec 19, 2008 19:29    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

What a gift. Thank you Christian and Jordi. Merry Christmas to you too.
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PostPosted: Dec 19, 2008 21:20    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

very nice Spanish micro-wonders , really mind blowing , regarding Christian Rewitzer a very nice popular personality, he really like to hear from others.
thank you very much and congratulation Christian Rewitzer.
Happy new year and Christmas.
ikram
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PostPosted: Dec 21, 2008 06:11    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

The only thing lacking with regard to these extraordinary photos is a better means of indicating size. Magnification is very hard to relate to, most of us can't easily translate that to crystal size or field of view size. The photos are lovely, the best I have seen.
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PostPosted: Dec 21, 2008 06:27    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

really good shots,a wonderfull travel into the micro world!
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PostPosted: Dec 21, 2008 06:40    Post subject: Re: The "tricks" of Christian Rewitzer to do micro photographs  

Truly awe inspiring photgraphy, congratulations Christan.

I would like to wish everyone a fantastic Christmas/ holiday session

Cheers
Jon
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PostPosted: Dec 24, 2008 06:41    Post subject: Re: The tricks of Christian Rewitzer to do micro photographs  

A new batch from Christian. Same beauty as previously but this time with sizes, as Christian sent it to me.
As soon as I have time I will place them also in the previous images.

Enjoy!



Emmonsite Moctezuma-Mexico.jpg
 Description:
Emmonsite from Moctezuma, Sonora, Mexico.
Field of view: 3.2 mm
 Viewed:  62142 Time(s)

Emmonsite Moctezuma-Mexico.jpg



Henmillite Japan.jpg
 Description:
Henmilite from Fuka Mine, Bicchu town, Kawakama County, Okayama prefecture, Japan.
Field of view: 1,8 mm
 Viewed:  62112 Time(s)

Henmillite Japan.jpg



Zanazziite Jenipapo.jpg
 Description:
Zanazziite from Jenipapo, Itinga, Araçuaí, Minas Gerais, Brazil.
Field of view: 1 mm
 Viewed:  62115 Time(s)

Zanazziite Jenipapo.jpg



Lammerite Chile.jpg
 Description:
Lammerite from El Guanaco Mine, Antofagasta, Chile.
Field of view: 3.8 mm
 Viewed:  62086 Time(s)

Lammerite Chile.jpg



Pyrochlor Malawi.jpg
 Description:
Pyrochlore from Mont Malosa, Malawi.
Field of view: 0.5 mm
 Viewed:  62262 Time(s)

Pyrochlor Malawi.jpg


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PostPosted: Dec 26, 2008 11:15    Post subject: Re: The tricks of Christian Rewitzer to do micro photographs  

A new lot, this time from Italy and Sweden.


Titanite-Onano,Italy.jpg
 Description:
Titanite from Montenero Quarry, Onano, Viterbo, Lazio, Italy.
Field of view: 1 mm
 Viewed:  62031 Time(s)

Titanite-Onano,Italy.jpg



Quenselite-Langban,S.jpg
 Description:
Quenselite from Långban, Filipstad, Värmland, Sweden.
Field of view: 0.6 mm
 Viewed:  62030 Time(s)

Quenselite-Langban,S.jpg



Fluoro-Edenite2-Italy.jpg
 Description:
Fluoro-edenite from Monte Calvario, Biancavilla, Etna Vulcano, Catania, Sicilia, Italy.
Field of view: 1.8 mm
 Viewed:  62032 Time(s)

Fluoro-Edenite2-Italy.jpg



Fluoro-Edenite,-Italy.jpg
 Description:
Fluoro-edenite from Monte Calvario, Biancavilla, Etna Vulcano, Catania, Sicilia, Italy.
Field of view: 1.2 mm
 Viewed:  62057 Time(s)

Fluoro-Edenite,-Italy.jpg


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PostPosted: Dec 26, 2008 13:26    Post subject: Re: The tricks of Christian Rewitzer to do micro photographs  

John S. White wrote:
>The only thing lacking with regard to these extraordinary photos is a better means of indicating size.

Now all specimens from Christian have their field of view size. Thanks to Christian to send them!

Jordi
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PostPosted: Dec 27, 2008 13:45    Post subject: Re: The tricks of Christian Rewitzer to do micro photographs  

Last lot of the fabulous photos of Christian. Luckily, he promised to do more and send it to me to share them with everybody here!

Jordi



Laueite Hagendorf Germany.jpg
 Description:
Laueite from Hagendorf, Waidhaus, Vohenstrauß, Oberpfälzer Wald, Bavaria, Germany.
Field of view: 1.2 mm
 Viewed:  61985 Time(s)

Laueite Hagendorf Germany.jpg



Laueite 2 Hagendorf Germany.jpg
 Description:
Laueite from Hagendorf, Waidhaus, Vohenstrauß, Oberpfälzer Wald, Bavaria, Germany.
Field of view: 0.8 mm
 Viewed:  61950 Time(s)

Laueite 2 Hagendorf Germany.jpg



Stewartite Hagendorf Germany.jpg
 Description:
Stewartite from Hagendorf, Waidhaus, Vohenstrauß, Oberpfälzer Wald, Bavaria, Germany.
Field of view: 1.6 mm
 Viewed:  61957 Time(s)

Stewartite Hagendorf Germany.jpg



Olivenite Clara Mine Germany.jpg
 Description:
Olivenite from Clara Mine, Black Forest, Germany.
Field of view: 1.6 mm
 Viewed:  61970 Time(s)

Olivenite Clara Mine Germany.jpg



Hematolite Moss Mine Germany.jpg
 Description:
Hematolite from Moss Mine, Germany.
Field of view: 6 mm
 Viewed:  61976 Time(s)

Hematolite Moss Mine Germany.jpg



Uranophane Menzenschwand Germany.jpg
 Description:
Uranophane from Menzenschwand, Black Forest, Germany.
Field of view: 0.8 mm
 Viewed:  62088 Time(s)

Uranophane Menzenschwand Germany.jpg


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