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magnetic sample holder

 
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Michael61



Joined: 11 Apr 2011
Posts: 8
Location: Greifswald/Germany

PostPosted: Sat Jun 15, 2013 4:17 am    Post subject: magnetic sample holder Reply with quote

Hi to everybody,
mostly I'm a reading member of this excellent forum. I've learned a lot here. Many thanks to all.
Now I want to share my construction of a magnetic sampleholder related to this earlier discussion in 2009.
http://www.photomacrography.net/forum/viewtopic.php?t=8118&highlight=specimen+holder

I bought some suited magnets from this shop www.magnet-shop.net and here you can see the result:

The arm should be non-ferromagnetic, otherwise it would be attracted by the very strong neodymium magnets. The pro's are:
- very small (center of the ball is 35mm over the plate)
- high degree of freedom
- very smooth movements
- no movement after taking the hands off

Next application is a tilting table with a piece of adhesive pad using a steel washer:


And a third application is to use a steel crossed foreceps (which I still have to buy)

The total costs would be about 10$ for this useful tool.
Usually, microscopes are made from aluminum or brass, but be careful with any magnetic tools on your desk. These magnets are very strong!

Who wants to enjoy some of my 3D-pics and stacks of insects, have a look here please:
http://www.fotocommunity.de/fotograf/micha-luhn/fotos/3d-bienen/649957

greetings from germany
Micha
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Guido



Joined: 08 Jun 2011
Posts: 175

PostPosted: Sat Jun 15, 2013 9:24 am    Post subject: Reply with quote

Think magnets are dangerous to lcd's to.
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rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 17614
Location: Richland, Washington State, USA

PostPosted: Sat Jun 15, 2013 10:37 am    Post subject: Reply with quote

Michael, thank you for the idea for the sample holder built of magnets. This is very clever!

Quote:
Who wants to enjoy some of my 3D-pics and stacks of insects, have a look here please:
http://www.fotocommunity.de/fotograf/micha-luhn/fotos/3d-bienen/649957

Looking at your website, http://www.fotocommunity.de/pc/pc/pcat/649957/display/31224767, I am very impressed and curious. What setup and techniques are you using to get such excellent stereo of a wasp in flight with prey??

Guido wrote:
Think magnets are dangerous to lcd's to.

I have not seen any reliable reports about LCD's being damaged by magnetic fields. CRTs yes, LCD's no. I've actually placed those magnets directly on several LCD screens, hoping to see some little effect. But there's been no effect that I could see.

Physical pressure is the only plausible mechanism I've seen suggested for damage to an LCD. If you were unlucky enough to have a magnetic component inside or behind the display, and one of those magnets got stuck to the front, I imagine you could end up with a scratched, dented, or cracked panel. Even so, I haven't seen an actual report of this happening.

If anybody else has different information, I would appreciate hearing.

--Rik
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Michael61



Joined: 11 Apr 2011
Posts: 8
Location: Greifswald/Germany

PostPosted: Sat Jun 15, 2013 12:30 pm    Post subject: Reply with quote

@Guido
A modern flat screen monitor consists of TFT's, which are insensitive against magnetic fields.

Thanks for the compliment, Rik.
For moving insects I use my self made stereo lensand a flash diffuser:
http://fc-foto.de/7965747
The two achromats I bought from Edmund Optics.

Micha
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ChrisR
Site Admin


Joined: 14 Mar 2009
Posts: 6782
Location: Near London, UK

PostPosted: Sat Jun 15, 2013 12:51 pm    Post subject: Reply with quote

Very nice Micha Very Happy
I've tried simple pairs of small lenses, and failed to make it work. Perhaps all I needed was your black paper "door"!
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Guido



Joined: 08 Jun 2011
Posts: 175

PostPosted: Sun Jun 16, 2013 12:07 pm    Post subject: Reply with quote

I was thinking on the lcd screen from the camera.
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Olympusman



Joined: 15 Jan 2012
Posts: 3030

PostPosted: Mon Jun 17, 2013 7:52 am    Post subject: Magnetic holder Reply with quote

Micha,
Very clever indeed!
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Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA
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