magnetic sample holder

A forum to ask questions, post setups, and generally discuss anything having to do with photomacrography and photomicroscopy.

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Michael61
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Joined: Mon Apr 11, 2011 6:36 am
Location: Greifswald/Germany
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magnetic sample holder

Post by Michael61 »

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/v ... men+holder

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

And a third application is to use a steel crossed foreceps (which I still have to buy)
Image
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/mi ... nen/649957

greetings from germany
Micha

Guido
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Joined: Wed Jun 08, 2011 1:02 am

Post by Guido »

Think magnets are dangerous to lcd's to.

rjlittlefield
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Location: Richland, Washington State, USA
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Post by rjlittlefield »

Michael, thank you for the idea for the sample holder built of magnets. This is very clever!
Who wants to enjoy some of my 3D-pics and stacks of insects, have a look here please:
http://www.fotocommunity.de/fotograf/mi ... nen/649957
Looking at your website, http://www.fotocommunity.de/pc/pc/pcat/ ... y/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

Michael61
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Joined: Mon Apr 11, 2011 6:36 am
Location: Greifswald/Germany
Contact:

Post by Michael61 »

@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

ChrisR
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Joined: Sat Mar 14, 2009 3:58 am
Location: Near London, UK

Post by ChrisR »

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

Guido
Posts: 332
Joined: Wed Jun 08, 2011 1:02 am

Post by Guido »

I was thinking on the lcd screen from the camera.

Olympusman
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Joined: Sun Jan 15, 2012 12:31 pm

Magnetic holder

Post by Olympusman »

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

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