I see stars - Asterionella diatoms in dark field

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MicroBob
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I see stars - Asterionella diatoms in dark field

#1 Post by MicroBob » Sun Jun 28, 2020 7:02 pm

Hi together,
here some Asterionella diatoms. Cleaned by incineration, milk carton dark field stop on light exit in the foot. 16:1 plan.
I brought the Junior which proves very nice with bright battery illumination with 12V Bosch power tool battery and USB converter. What I miss from the Phomi is the Optovar with high power dry 40:1.

Bob
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Hobbyst46
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Re: I see stars - Asterionella diatoms in dark field

#2 Post by Hobbyst46 » Sun Jun 28, 2020 7:14 pm

Great catch, Bob !
Zeiss Standard GFL+Canon EOS-M10, Olympus VMZ stereo

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75RR
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Re: I see stars - Asterionella diatoms in dark field

#3 Post by 75RR » Sun Jun 28, 2020 7:33 pm

Agree, nice catch
What I miss from the Phomi is the Optovar with high power dry 40:1.
What do you use, 1.25 or 1.6. I find 2 to be too much.
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
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MicroBob
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Re: I see stars - Asterionella diatoms in dark field

#4 Post by MicroBob » Sun Jun 28, 2020 8:05 pm

With very small objects it is optical vs. digital magnification. But in most cases I too use max. the 1,6 setting.

DrPhoxinus
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Re: I see stars - Asterionella diatoms in dark field

#5 Post by DrPhoxinus » Mon Jun 29, 2020 10:17 am

Does the scope use 6v or 12?

Do you step down 12v to 6?

What USB converter?

Thanks

Gerard

MicroBob
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Re: I see stars - Asterionella diatoms in dark field

#6 Post by MicroBob » Mon Jun 29, 2020 11:17 am

It's a typical single 3W Cree LED, powered via USB cable over a 0,47Ohm resistor in row with a wire potentiometer. The USB power source is a Bosch GAA 12V with batteries from 2 to 6 Ah.

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janvangastel
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Re: I see stars - Asterionella diatoms in dark field

#7 Post by janvangastel » Mon Jun 29, 2020 3:24 pm

Looks good Bob!

DonSchaeffer
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Re: I see stars - Asterionella diatoms in dark field

#8 Post by DonSchaeffer » Mon Jun 29, 2020 10:13 pm

These look a little like the skeletons of small sponges, but they usually have only three spines.

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