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A Single and Double Diatom
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Mitch640



Joined: 15 Aug 2010
Posts: 2137

PostPosted: Wed Sep 01, 2010 3:48 pm    Post subject: Reply with quote

Charles, Here is a full frame shot. No lens, no adapter, just shot down through that dusty lens pictured above. It's even in focus, more or less. 4x used. I had to clean up the WB, it was very red.

Rik, I will try that tomorrow. I'm winding down now. Smile

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NikonUser



Joined: 04 Sep 2008
Posts: 2533
Location: southern New Brunswick, Canada

PostPosted: Wed Sep 01, 2010 3:55 pm    Post subject: Reply with quote

I have recently photographed a diatom similar to your 2nd image,
I measured it as 188 microns (0.188 mm).
If your 1st diatom was similar in size to your second then its length could be
117 microns
_________________
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives
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Mitch640



Joined: 15 Aug 2010
Posts: 2137

PostPosted: Wed Sep 01, 2010 4:05 pm    Post subject: Reply with quote

NU, no, that first one was only about 1/4 to 1/3 as long as the second one. The second one, would not fit in the frame at higher magnification. In fact, in that third image, the one with the double, there is a single one at the edge of the water, laid out vertically.

I admit, I still don't have a grasp of how big a mm is, but 11mm did not seem too small, as I was shooting these at 400x and they were still small.
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