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My Arachnoidiscus

Posted: Sat May 09, 2020 7:41 pm
by Charles
This is my Arachnoidiscus from a sample sent to me from Edmonds, WA. Sample was cleaned and mounted in Zrax about two years ago.

The Arachnoidiscus is one species of this type slide:
Slide2.jpg
Slide2.jpg (50.55 KiB) Viewed 1886 times
The view from the B&L Stereomicroscope at 4X:
4X.jpg
4X.jpg (62.23 KiB) Viewed 1886 times
One shot taken with a 25X Zeiss Neofluar and Canon Ti3
25X trimmed.jpg
25X trimmed.jpg (216.1 KiB) Viewed 1886 times
One shot taken with a 100X Zeiss Neofluar and Canon Ti3
100X.jpg
100X.jpg (211.67 KiB) Viewed 1886 times

Re: My Arachnoidiscus

Posted: Sat May 09, 2020 9:50 pm
by DonSchaeffer
amazing!

Re: My Arachnoidiscus

Posted: Mon May 11, 2020 3:15 pm
by keithstout
Whoa! I'm sold. Incredible images. I almost have all my goodies together. I can't wait to get started. Many thanks, Charles. You're doing such great work. Keith

Re: My Arachnoidiscus

Posted: Mon May 11, 2020 3:30 pm
by Chris Dee
Lovely oblique/brightfield images. I know DIC is often the desired method for these subjects, but I still much prefer this type of shot. Thanks for sharing.

Re: My Arachnoidiscus

Posted: Thu May 14, 2020 5:24 pm
by Sabatini
Great work

Re: My Arachnoidiscus

Posted: Thu May 14, 2020 6:48 pm
by photomicro
Chris Dee wrote:
Mon May 11, 2020 3:30 pm
Lovely oblique/brightfield images. I know DIC is often the desired method for these subjects, but I still much prefer this type of shot. Thanks for sharing.


I agree, I like this kind of method too. Perhaps it is because I don't have DIC at present, though I used to, but it does seem to work nicely with diatoms.



This (below) is Arachnoidiscus japonicas, from an old Watson slide.



A. japonicus.jpg
A. japonicus.jpg (321.82 KiB) Viewed 1710 times

Re: My Arachnoidiscus

Posted: Thu May 14, 2020 9:19 pm
by 75RR
Charles wrote:
Sat May 09, 2020 7:41 pm
This is my Arachnoidiscus from a sample sent to me from Edmonds, WA. Sample was cleaned and mounted in Zrax about two years ago.
Misread your opening sentence. Thought at first that the slide was by Edmonds.

Only now did I realize that it was yours! Most impressive work, as can be judged by your image of Arachnoidiscus.

Consensus seems to be that your image is Oblique, it does however look like Brightfield to me. Perhaps you can let us know.

Re: My Arachnoidiscus

Posted: Thu May 14, 2020 9:23 pm
by 75RR
Nicely imaged grouping photomicro, what objective did you use?
Perhaps it is because I don't have DIC at present, though I used to ...
What is the story there? Upgrading to an infinity system?

Re: My Arachnoidiscus

Posted: Fri May 15, 2020 12:36 am
by Charles
75RR wrote:
Thu May 14, 2020 9:19 pm
Consensus seems to be that your image is Oblique, it does however look like Brightfield to me. Perhaps you can let us know.
Yes, both the 25X and 100X are oblique.

Thank you all.

Re: My Arachnoidiscus

Posted: Fri May 15, 2020 8:38 am
by photomicro
75RR wrote:
Thu May 14, 2020 9:23 pm
Nicely imaged grouping photomicro, what objective did you use?
Perhaps it is because I don't have DIC at present, though I used to ...
What is the story there? Upgrading to an infinity system?
Used a x20 objective. This is VAC, or variable amplitude contrast, which is easily made for any stand.

In terms of a story...yes there is. I had too many stands, though my main one(s) were Zeiss West, I was frustrated over time with de-lamination. So, I got rid of all my stands except one make (but with one other for sentimental reasons) which meant losing all the Zeiss, and DIC capability. In truth, being the initial Zeiss common slider system, it was never as good as the sort of thing we see now.

The make I am sticking with is Nikon, though by chance rather than planning, I have 160 and infinity !

Mike