Search found 1523 matches

by MichaelG.
Sat Dec 14, 2019 3:08 pm
Forum: Specimens, samples and slides
Topic: A source for diatoms
Replies: 10
Views: 177

Re: A source for diatoms

Looks pretty diatomaceous to me !

MichaelG.
.

Edit: Here’s some info. about the Harris product:
https://pfharris.com/products/food-grad ... ous-earth/
by MichaelG.
Sat Dec 14, 2019 12:02 pm
Forum: Pictures and Videos
Topic: Diatoms from the Seychelles!
Replies: 13
Views: 189

Re: Diatoms from the Seychelles!

Thanks for the link, Kurt
... a very informative article.

MichaelG.
by MichaelG.
Thu Dec 12, 2019 8:59 am
Forum: For forum members who want to buy and sell equipment
Topic: Bausch & Lomb Type H, 1932-3...SOLD....
Replies: 10
Views: 2214

Re: Bausch & Lomb Type H, 1932-3...SOLD....

Mike-Roscope wrote:
Mon Dec 02, 2019 5:58 pm
And, accessioned :
https://onih.pastperfectonline.com/webo ... 9280997140
Nicely documented

MichaelG.
by MichaelG.
Wed Dec 11, 2019 8:24 am
Forum: Introduce yourself
Topic: Re: Hello human
Replies: 0
Views: 71

Re: Hello human

:D

Edit: I see that the original post has been deleted; so now my ‘reply’ stands alone without any context.

This is quite surreal !!
by MichaelG.
Wed Dec 11, 2019 8:23 am
Forum: Microscopes and optics
Topic: Leitz binocular head teardown
Replies: 9
Views: 944

Re: Leitz binocular head teardown

Congratulations on your success, and thanks for the reference photos.

MichaelG.
by MichaelG.
Tue Dec 10, 2019 11:26 pm
Forum: Home-made microscope adaptations
Topic: AO Starlite external Illuminator led retrofit.
Replies: 7
Views: 128

Re: AO Starlite external Illuminator led retrofit.

Having found a nice copy of a catalogue to peruse: https://mightyohm.com/wiki/_media/resources:aostereostarcatalog.pdf ... I am a little concerned about your choice of LED lamp Although I am not familiar with the Starlite illuminator, it seems clear that it uses fixed pre-focused bulb and condenser ...
by MichaelG.
Tue Dec 10, 2019 8:03 pm
Forum: Pictures and Videos
Topic: Muscles in leg of centipede
Replies: 5
Views: 114

Re: Muscles in leg of centipede

Wonderful, informative, image !!

MichaelG.
by MichaelG.
Tue Dec 10, 2019 5:21 pm
Forum: Home-made microscope adaptations
Topic: AO Starlite external Illuminator led retrofit.
Replies: 7
Views: 128

Re: AO Starlite external Illuminator led retrofit.

Nicely documented, thanks.

I’m interested, and a little surprised, to see you converting to LED
... If my memory serves; you have previously been rather anti

Hopefully, the newer/warmer versions are to your taste.

MichaelG.
by MichaelG.
Mon Dec 09, 2019 12:11 am
Forum: Microscopes and optics
Topic: Zeiss and Gem Scopes
Replies: 6
Views: 126

Re: Zeiss and Gem Scopes

Stemi 305 and Stemi 508 appear to be the Zeiss gemological offerings https://www.jewelsntools.com/carl-zeiss-stemi-508-trinocular-microscope.html No Idea how good they might be, but I find the design rather uninspiring. MichaelG. . Edit: Whilst browsing around, I found this, which uses the Stemi 508...
by MichaelG.
Thu Dec 05, 2019 5:32 pm
Forum: Miscellaneous
Topic: Is there a recognised definition of ‘Microplastics’ ?
Replies: 5
Views: 129

Re: Is there a recognised definition of ‘Microplastics’ ?

Citation: "We aimed to isolate, identify, and quantify microplastics 5–333 μm in size, a subgroup of microplastics which we termed mini-microplastic." I think that the "key" number of 333 um is based on a popular standard mesh size of the tow net. Agreed ... I think that much is clear Perhaps I exp...
by MichaelG.
Thu Dec 05, 2019 9:17 am
Forum: Miscellaneous
Topic: Is there a recognised definition of ‘Microplastics’ ?
Replies: 5
Views: 129

Re: Is there a recognised definition of ‘Microplastics’ ?

When you read a simplistic summary of research in the popular press, sometimes it makes no sense. You will have to read the journal article to understand the constraints and methodologies involved, and to understand the conclusions. You certainly won't get any of that from Fox News. Yes, I am aware...
by MichaelG.
Wed Dec 04, 2019 11:22 pm
Forum: Miscellaneous
Topic: Is there a recognised definition of ‘Microplastics’ ?
Replies: 5
Views: 129

Is there a recognised definition of ‘Microplastics’ ?

I have just read this, from Fox News https://www.foxnews.com/science/oceans-a-million-times-microplastic-than-we-realized and I am utterly bemused. How can quantitative surveys of ‘Microplastics’ have any credibility ? MichaelG. . Note: The published paper is available via the link in the ‘News’ rep...
by MichaelG.
Mon Dec 02, 2019 11:07 am
Forum: Camera systems and imaging
Topic: HA2307 HDMI industrial camera
Replies: 39
Views: 5319

Re: HA2307 HDMI industrial camera

This is directed to no-one in particular, but may be of interest to those unfamiliar with Nyquist: […] And here is a real-life image [my own work] of three Airy patterns, which nicely illustrates the type of analogue structure that we are sampling when we image, for example, a diatom. 2BFD1C53-DCBD...
by MichaelG.
Sat Nov 30, 2019 9:43 pm
Forum: Illumination Techniques
Topic: Identifying asbestos
Replies: 25
Views: 1442

Re: Identifying asbestos

Field microscopes can be very useful in biological work, and probably this petrographic scope could also be used for mineral samples such as soil and crushed grains. In the olden days, we would scrape off rock particles into a drop of immersion oil on a slide, and attempt identification via birefri...
by MichaelG.
Sat Nov 30, 2019 10:08 am
Forum: Microscopes and optics
Topic: Microscope for my wife?
Replies: 10
Views: 246

Re: Microscope for my wife?

Hi All! I’m hoping you all can help me out... My wife wants to get a microscope that would allow her to take images of microscopic stuff (forgive me lay person verbiage? :-/), then blow it up to be painted and essentially turned into art. Can anyone recommend a microscope that would allow her to ta...
by MichaelG.
Sat Nov 30, 2019 9:35 am
Forum: Pictures and Videos
Topic: Pater noster tractor ruts meiofauna and protists
Replies: 35
Views: 1701

Re: Pater noster tractor ruts meiofauna and protists

Great post, Malpi ... I enjoyed reading that. Regarding your rhetorical question " An epibiont (from the Ancient Greek meaning 'living on top of') is an organism that lives on the surface of another living organism. An epibiont is, by definition(A*), harmless to its host. […] (A) by who's definition...
by MichaelG.
Tue Nov 26, 2019 8:54 am
Forum: My microscope
Topic: Newbie Needs Help Identifying Microscope.....please.
Replies: 11
Views: 3002

Re: Newbie Needs Help Identifying Microscope.....please.

dawsonmic wrote:
Tue Nov 26, 2019 4:07 am
Hi Bob,
Joined the forum so I could respond to your inquiry […]
… and a great response it is, too !!

Welcome aboard
MichaelG.
by MichaelG.
Mon Nov 25, 2019 10:28 am
Forum: Digital processing
Topic: Digitizing 35mm micro photography tranparency images
Replies: 4
Views: 246

Re: Digitizing 35mm micro photography tranparency images

Here’s a fairly detailed review of the Reflecta DigitDia 5000 [which appears to be what they use]
https://www.filmscanner.info/en/Reflect ... a5000.html

MichaelG.
by MichaelG.
Mon Nov 25, 2019 5:53 am
Forum: Illumination Techniques
Topic: Identifying asbestos
Replies: 25
Views: 1442

Re: Identifying asbestos

rs6000 wrote:
Wed Nov 20, 2019 11:15 pm
looks like I as well need a specialized Dispersion Staining objective DS type objective one that I have never seen on any website :shock:
I noticed reference to this DIY project in John Gustav Delly’s recent book:
http://www.mccroneinstitute.org/uploads ... -84932.pdf

MichaelG.
by MichaelG.
Sun Nov 24, 2019 10:36 pm
Forum: Beginner's corner
Topic: Nikon Optiphot replacement bulb
Replies: 9
Views: 290

Re: Nikon Optiphot replacement bulb

7027 should be readily available worldwide ... it is [or was] very widely used: https://www.mygreenlighting.co.uk/replacement_bulbs/halogen_capsules/gy6_35_bulbs/8925.html MichaelG. . Edit: just noticed that Osram also offers a Xenon filled version, which is brighter: https://www.osram.com/appsj/pdc...
by MichaelG.
Sun Nov 24, 2019 3:03 pm
Forum: Camera systems and imaging
Topic: Is it possible to attach a video camera to a microscope?
Replies: 6
Views: 225

Re: Is it possible to attach a video camera to a microscope?

Welcome, Leor I can see no great problem with using your camera on the microscope ... some folks get very good images with cell-phones. I would use an eyepiece in the photo-port and adjust the camera lens to give best coverage. ... Lash-up something first [maybe put the camera on a tripod] and try ...
by MichaelG.
Sun Nov 24, 2019 2:53 pm
Forum: Pictures and Videos
Topic: Focus stacking
Replies: 15
Views: 396

Re: Focus stacking

Exactly what I had in mind, Bob
... I was just waiting to see if friend Glot would spot that opportunity.

MichaelG.
by MichaelG.
Sun Nov 24, 2019 12:03 pm
Forum: Pictures and Videos
Topic: Nitzschia sigma
Replies: 19
Views: 487

Re: Nitzschia sigma

Regarding the 4900x image : It is interesting to speculate how good the original silver image must have been. It is very clear that the image we are seeing has been considerably degraded by the scanning process ... and the published image was, of course, already poorer than the original. MichaelG. 1...
by MichaelG.
Sun Nov 24, 2019 10:48 am
Forum: Pictures and Videos
Topic: Focus stacking
Replies: 15
Views: 396

Re: Focus stacking

Glot wrote:
Sun Nov 24, 2019 7:39 am
Fun learning. Finer steps needed.
Keep up the good work, and keep enjoying it

One suggestion ... Instead of modifying/replacing the main focus, consider using a fine-focus stage for the specimen.

MichaelG.
by MichaelG.
Sun Nov 24, 2019 9:04 am
Forum: Pictures and Videos
Topic: Nitzschia sigma
Replies: 19
Views: 487

Re: Nitzschia sigma

Thanks 75RR for the post of the 4900x enlargement. It is impressive, and as previously discussed, was achieved by means of illumination, condenser, media and slide optimization; likely a 1.6NA objective alone would not provide such nice details. I agree ... and I think our inability to match such r...
by MichaelG.
Sat Nov 23, 2019 10:49 am
Forum: Beginner's corner
Topic: thinking out loud here - moral thoughts
Replies: 13
Views: 604

Re: thinking out loud here - moral thoughts

May I suggest reading this recent discussion:
viewtopic.php?f=25&t=7795&hilit=mintakax
Dan [mintakax] prompted some serious introspection.

MichaelG.
by MichaelG.
Sat Nov 23, 2019 9:39 am
Forum: Pictures and Videos
Topic: Focus stacking
Replies: 15
Views: 396

Re: Focus stacking

... The image is stable through the eye pieces but creeps in the camera as I focus You posted that reply whilst I was composing mine, so [sorry] I missed it. The apparent stability of the visual image is a nice demonstration of the fact that ‘seeing’ is not a purely optical function, but a complex ...
by MichaelG.
Fri Nov 22, 2019 10:01 pm
Forum: Pictures and Videos
Topic: Focus stacking
Replies: 15
Views: 396

Re: Focus stacking

... One issue I have is the image creeps sideways on the monitor. It has to be a mis alignment of a prism or what ever they use to split the image. ... I think that is probably what Bob had in mind when he asked whether you were using a stereo microscope. If the subject is flat on the stage then st...
by MichaelG.
Fri Nov 22, 2019 8:23 am
Forum: Beginner's corner
Topic: Working Distance, Low-Mag Objectives
Replies: 7
Views: 242

Re: Working Distance, Low-Mag Objectives

Hi, I’ve just acquired an old Meiji ML2000 microscope […] Scarodactyl has the answer ... and my first assumption about the model of microscope was wrong. The version that I linked uses 160mm objectives, but yours must be infinity corrected [which would make it not old , but nearly new, by my standa...
by MichaelG.
Thu Nov 21, 2019 9:17 am
Forum: Microscopes and optics
Topic: Lamp house grease
Replies: 7
Views: 248

Re: Lamp house grease

The copper-rich greases, typically specified for use on the back of brake-pads,
e.g. https://www.commaoil.com/productsguide/view/6/220
would probably do the job nicely.

MichaelG.