Search found 1684 matches

by MichaelG.
Tue Mar 31, 2020 9:27 pm
Forum: Pictures and Videos
Topic: Fossiliferous chalcedony
Replies: 6
Views: 108

Re: Fossiliferous chalcedony

I am no expert, but Chalcedony is one of the many forms of Quartz:
https://rocktumbler.com/blog/what-is-ag ... halcedony/

And ‘fossiliferous’ means there are fossils in it

MichaelG.
by MichaelG.
Tue Mar 31, 2020 3:49 pm
Forum: Microscopes and optics
Topic: Vickers M17 refurb' & modification
Replies: 21
Views: 169

Re: Vickers M17 refurb' & modification

Chris ... I forgot to thank you for the ebay reference for that damping grease

Recommendations like that are very helpful.

MichaelG.

.
Incidentally, I have [thanks to Google] just translated the Chinese characters on the lid
... It does indeed say Damping Grease
by MichaelG.
Mon Mar 30, 2020 9:58 pm
Forum: Microscopes and optics
Topic: Vickers M17 refurb' & modification
Replies: 21
Views: 169

Re: Vickers M17 refurb' & modification

High Michael I really enjoyed the work, thanks. The odd thing about this flange to sensor/film distance thing is the Olympus OM film mount is only 2mm deeper than the Canon EF mount, the numbers don't add up. I strongly suspect the 125 on these eyepieces is very specific to the Olympus photo tube s...
by MichaelG.
Mon Mar 30, 2020 9:14 pm
Forum: Microscopes and optics
Topic: Vickers M17 refurb' & modification
Replies: 21
Views: 169

Re: Vickers M17 refurb' & modification

I took a chance on the Vickers M17 pictured below […] On the subject of projection eyepieces and the flange step to sensor distance.. I've read various figures stated for Olympus NFK 125 LD eyepieces from 125mm to 150mm (the distance between the step on the eyepiece which rests against the photo tu...
by MichaelG.
Mon Mar 30, 2020 6:19 pm
Forum: Pictures and Videos
Topic: Fossiliferous chalcedony
Replies: 6
Views: 108

Re: Fossiliferous chalcedony

Spectacular !!

MichaelG.
by MichaelG.
Sun Mar 29, 2020 11:11 pm
Forum: Off Topic
Topic: Micscape online Magazine
Replies: 28
Views: 4461

Re: Micscape online Magazine

I hadn’t looked at the March 2020 issue of Micscape until I read through this discussion, but I would suggest that the most important statement on this page: http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/x_indexmag.html must be (Please note: I have no medical ...
by MichaelG.
Sun Mar 29, 2020 7:48 pm
Forum: Pictures and Videos
Topic: Brouche
Replies: 4
Views: 114

Re: Brouche

Good Man ... Versions to suit everyone
... keep up the great work !!

MichaelG.
by MichaelG.
Sat Mar 28, 2020 11:10 pm
Forum: Pictures and Videos
Topic: Brouche
Replies: 4
Views: 114

Re: Brouche

That’s rather lovely, Saul
... Thanks for sharing it.

MichaelG.
by MichaelG.
Sat Mar 28, 2020 8:23 pm
Forum: Microscopy accessories
Topic: Olympus camera mount
Replies: 1
Views: 42

Re: Olympus camera mount

The original Olympus item is exactly the right size, and very well made.
... Anything else that matches those criteria will do the job equally well.

Essentially it’s just a spacer tube.
... Don’t forget that you will also need the relay lens [projection eyepiece]

MichaelG.
by MichaelG.
Wed Mar 25, 2020 10:07 pm
Forum: Pictures and Videos
Topic: A close-up of a broken diatom?
Replies: 9
Views: 156

Re: A close-up of a broken diatom?

Nice work, KD

MichaelG.
by MichaelG.
Wed Mar 25, 2020 8:53 pm
Forum: Microscopes and optics
Topic: Strange apparatus on Leitz Orthoplan nosepiece?
Replies: 28
Views: 431

Re: Strange apparatus on Leitz Orthoplan nosepiece?

Rorschach wrote:
Wed Mar 25, 2020 8:09 pm
So, looks like I have a Metalloplan :shock:
Lucky You !!

MichaelG.
by MichaelG.
Wed Mar 25, 2020 8:04 pm
Forum: Beginner's corner
Topic: Olympus Plan Apo 40x 0.95NA 0.11-0.23 coverslip - correction collar screw?
Replies: 2
Views: 74

Re: Olympus Plan Apo 40x 0.95NA 0.11-0.23 coverslip - correction collar screw?

The little screw probably just fixes the chrome sleeve onto the [seized with old grease] helicoid adjuster.

MichaelG.
.

Have a look at the sectional view on this [Nikon] page:
https://www.microscopyu.com/microscopy- ... correction
by MichaelG.
Tue Mar 24, 2020 8:57 pm
Forum: Pictures and Videos
Topic: Water mite stereo
Replies: 13
Views: 299

Re: Water mite stereo

Well ... between us, I think we’ve done a nice demonstration

Some do parallel viewing, others do cross-eyed viewing:
A simple switch of Left/Right images lets the same pair suit those of either persuasion.

MichaelG.
by MichaelG.
Tue Mar 24, 2020 12:51 pm
Forum: Microscopes and optics
Topic: Strange apparatus on Leitz Orthoplan nosepiece?
Replies: 28
Views: 431

Re: Strange apparatus on Leitz Orthoplan nosepiece?

My guess is that it could be an indenter

MichaelG.
by MichaelG.
Tue Mar 24, 2020 9:33 am
Forum: Miscellaneous
Topic: Large SEM of Paralia sulcata
Replies: 7
Views: 131

Re: Large SEM of Paralia sulcata

Very eloquently put, John

... that’s what I was trying to express, with my clumsy technicalities about artefacts and limitations.

MichaelG.
by MichaelG.
Tue Mar 24, 2020 8:28 am
Forum: Miscellaneous
Topic: Large SEM of Paralia sulcata
Replies: 7
Views: 131

Re: Large SEM of Paralia sulcata

PostScript:

It’s a reality check, in a positive way ...
We are now even-better equipped to appreciate the artefacts and limitations inherent in optical imaging.

MichaelG.
by MichaelG.
Tue Mar 24, 2020 8:04 am
Forum: Miscellaneous
Topic: Large SEM of Paralia sulcata
Replies: 7
Views: 131

Re: Large SEM of Paralia sulcata

So now we know what we are trying to see :o

MichaelG.
by MichaelG.
Mon Mar 23, 2020 6:51 pm
Forum: Home-made microscope adaptations
Topic: Yet another LED retrofit topic
Replies: 5
Views: 177

Re: Yet another LED retrofit topic

Hobbyst46 wrote:
Mon Mar 23, 2020 4:42 pm
I presume the dimmer is a 600Hz PWM, not 600KHz ?
.

600KHz is quite feasible, it appears:

https://www.onsemi.com/products/power-m ... rs/ka7553a

MichaelG..
by MichaelG.
Mon Mar 23, 2020 3:02 pm
Forum: Microscopy accessories
Topic: Giant pipette
Replies: 3
Views: 118

Re: Giant pipette

A reasonable equivalent [usually made from high temperature plastic, these days] is a Turkey Baster.
Available from any good CookShop, and many of the ‘Bargain Stores’

MichaelG.
by MichaelG.
Mon Mar 23, 2020 10:24 am
Forum: For forum members who want to buy and sell equipment
Topic: Compound microscope recommendations?
Replies: 16
Views: 1769

Re: Compound microscope recommendations?

I am amused [and mildly irritated], to see that apochronaut’s jig has, when quoted, magically produced a hyperlink to an advertisement.

... We live in mysterious times.

MichaelG.
by MichaelG.
Mon Mar 23, 2020 7:57 am
Forum: Pictures and Videos
Topic: Water mite stereo
Replies: 13
Views: 299

Re: Water mite stereo

Saul wrote:
Sun Mar 22, 2020 7:45 pm
Swapped:
That ^^^ works very nicely, Saul

Thank You
MichaelG.
by MichaelG.
Sun Mar 22, 2020 4:39 pm
Forum: Pictures and Videos
Topic: Whole Mount Insect Slide Preparation
Replies: 5
Views: 187

Re: Whole Mount Insect Slide Preparation

+1 from me

MichaelG.
by MichaelG.
Sun Mar 22, 2020 10:49 am
Forum: Introduce yourself
Topic: Greetings from Winnipeg, Canada
Replies: 3
Views: 147

Re: Greetings from Winnipeg, Canada

Welcome aboard, Don

MichaelG.
by MichaelG.
Sun Mar 22, 2020 7:50 am
Forum: Pictures and Videos
Topic: Water mite stereo
Replies: 13
Views: 299

Re: Water mite stereo

Great images !!

Unfortunately for me: My free-viewing technique results in a hollow effect
... I will try swapping the Left and Right images

MichaelG.
by MichaelG.
Sun Mar 22, 2020 7:42 am
Forum: Beginner's corner
Topic: Camera taking bad bright field images
Replies: 22
Views: 404

Re: Camera taking bad bright field images

micro wrote:
Sun Mar 22, 2020 7:21 am
https://i.imgur.com/oYGyB41.jpg
What kind of screw driver does this need?
.

An Allen Key

Available in sets of good or bad quality ... but if you can find a decent tool supplier, buy a selection of the small sizes individually.
For these small screws they need to be a very good fit.

MichaelG.
by MichaelG.
Sun Mar 22, 2020 7:31 am
Forum: Digital processing
Topic: Bit Depth [recommended reading]
Replies: 1
Views: 160

Bit Depth [recommended reading]

Although this page is ‘about’ display equipment, there is much of relevance to digital micrography.
https://www.projectorcentral.com/All-Ab ... -Depth.htm

The animated test target [downloadable at Fig.3] is both elegant and informative.

MichaelG.
by MichaelG.
Sat Mar 21, 2020 8:07 pm
Forum: Miscellaneous
Topic: "Fibres" common topic? Did you make interesting observations or photos?
Replies: 17
Views: 478

Re: "Fibres" common topic? Did you make interesting observations or photos?

Congratulations, Bob

Your efforts seem to have be greatly rewarded.
... Well done, Sir

MichaelG.
by MichaelG.
Sat Mar 21, 2020 9:55 am
Forum: Miscellaneous
Topic: "Fibres" common topic? Did you make interesting observations or photos?
Replies: 17
Views: 478

Re: "Fibres" common topic? Did you make interesting observations or photos?

MicroBob wrote:
Sat Mar 21, 2020 8:46 am
Here is an interesting explanation for the function of the droplets: They keep the net taught: https://www.spektrum.de/news/fluessigfa ... en/1410637
Many thanks for that link, Bob

The video from Oxford is astonishing :!:

MichaelG.