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 Post subject: Marine Foram
PostPosted: Tue Jul 16, 2019 5:40 am 
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Joined: Sun Oct 12, 2014 2:34 am
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Location: Estepona
Planapo 63x/1.4, Oblique, 190┬Ám length, stacked in Photoshop, Marine sample, Alboran Sea


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Foram.jpg
Foram.jpg [ 181.61 KiB | Viewed 466 times ]

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Zeiss Standard WL on sick leave, Standard 18 & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)
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 Post subject: Re: Marine Foram
PostPosted: Tue Jul 16, 2019 7:03 am 
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Location: NorthWest England
That's a lovely image

MichaelG.

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 Post subject: Re: Marine Foram
PostPosted: Tue Jul 16, 2019 11:25 am 
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Wow, at first I thought what a great DIC shot but then I read the description. Tell us more about your oblique setup. To get this high quality detail out of oblique illumination at such an extreme NA is impressive to say the least. Excellent work! The organism is also beautiful. Overall very, very nice!!


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 Post subject: Re: Marine Foram
PostPosted: Tue Jul 16, 2019 2:50 pm 
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Location: Estepona
Thanks MichaelG. and Wes

I use the rotary condenser to achieve Oblique. I offset the Brightfield port and vary the condenser diaphragm size. This creates effects similar to some dedicated Oblique stops.

A rotating stage is also helpful as it allows one to illuminate the subject from the angle of choice.

Having an Optovar makes it much easier as one can see the changes through the eyepieces - no need to remove them and peer through a phase telescope.

My Optovar has, apart from a magnification changer of 1x, 1.25x, 1.6x, and 2x, an Amici-Bertrand lens (i.e. an auxiliary microscope) and an Analyzer. A must have for anyone with a Zeiss!

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Zeiss Standard WL on sick leave, Standard 18 & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)


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 Post subject: Re: Marine Foram
PostPosted: Fri Jul 19, 2019 7:13 pm 
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75RR wrote:
I use the rotary condenser to achieve Oblique. I offset the Brightfield port and vary the condenser diaphragm size. This creates effects similar to some dedicated Oblique stops.

Cool, thats how I get oblique out of my condenser too (never tried with the 63/1.4 planapo though). Interesting I thought this method is an unintended feature of the achromat aplanat condenser but in fact its the method suggested by Zeiss in their Phomi II manual (p. 31)

http://www.microscopy-uk.org.uk/zeiss/zeiss_pmII.pdf


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 Post subject: Re: Marine Foram
PostPosted: Fri Jul 19, 2019 8:29 pm 
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Quote:
Interesting I thought this method is an unintended feature of the achromat aplanat condenser but in fact its the method suggested by Zeiss in their Phomi II manual (p. 31)

http://www.microscopy-uk.org.uk/zeiss/zeiss_pmII.pdf
Curious that they suggest just offsetting the iris rather than both the iris and the port itself.

Here is a link to a short article about Zeiss Phase Condensers in case you have not seen it.

http://www.microscopy-uk.org.uk/mag/art ... denser.pdf

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Olympus E-P2 (Micro Four Thirds Camera)


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 Post subject: Re: Marine Foram
PostPosted: Fri Jul 19, 2019 9:18 pm 
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Joined: Mon Aug 21, 2017 9:02 pm
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75RR wrote:
Quote:
Interesting I thought this method is an unintended feature of the achromat aplanat condenser but in fact its the method suggested by Zeiss in their Phomi II manual (p. 31)

http://www.microscopy-uk.org.uk/zeiss/zeiss_pmII.pdf
Curious that they suggest just offsetting the iris rather than both the iris and the port itself.

Here is a link to a short article about Zeiss Phase Condensers in case you have not seen it.

http://www.microscopy-uk.org.uk/mag/art ... denser.pdf
They do instruct to move the port: After the aperture iris has been considerably closed (Cite from p.31), "...Move the revolving disk of the condenser far enough of its position J..."

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 Post subject: Re: Marine Foram
PostPosted: Fri Jul 19, 2019 9:21 pm 
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Quote:
They do instruct to move the port: After the aperture iris has been considerably closed (Cite from p.31), "...Move the revolving disk of the condenser far enough of its position J..."
Misread it! Thanks for the heads up

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