Micrasterias from The Netherlands

[Jan l'Amie]

Some Micrasterias specs found in The Netherlands


Micrasterias thomasiana


Micrasterias rotata


Micrasterias papillifera


Micrasterias truncata


Micrasterias crux-melitensis


Micrasterias americana


Micrasterias jenneri


thomasiana, rotata, papillifera, truncata, crux-melitensis, americana from
De Haeck Zegveld

jenneri from De IJzeren Man Hoge-Veluwe

Byomic BYO500T microscope
Photo tubus
Kreutz filter
Canon EOS 50D camera

[gjones]

Thanks for sharing. Great photos!

[Jan l'Amie]

Thanks !

Today for the first time at this forum.

[René]

wonderful details in your images, Jan. Could do with some contrast stretching.

Thanks for showing, René

[Simon W]

Nice! What magnification? Can you tell me what on earth a Kreutsz filter is? Even google doesn't know..

[Jan l'Amie]

I used a 25x PL objective and a 2,5x photo oculair and some cropping.
The real dimensions of the desmids are between 100 to 250 micron.

A Kreutz filter is a very easy to make home-made light filter.
Take a round piece of transparant acrylaatfoil (or a transparant thin filter)
that fits in your filter holder. Cover this filter with black sticky foil.
Cut a moonshape piece of 1/3 of the black foil and remove this from the transparant foil so the light can only pass thru the removed segment of the filter. Open your diafragma full. When you look now true the microscope at an object, you will see a nice depth of field. Maybe you have to experiment a little with the size of the segment you have to remove but making this filter is very cheap so just make another one if you not satisfied the first time. Works great.

[Jan l'Amie]

Kreutz filter

[Simon W]

Thanks for the explanation Jan. I'll give it a try one day.