Search found 273 matches

by wporter
Wed Jan 15, 2020 5:07 pm
Forum: Beginner's corner
Topic: Advice on next upgrade to a T390, looking to observe yeast and bacteria.
Replies: 9
Views: 185

Re: Advice on next upgrade to a T390, looking to observe yeast and bacteria.

Really well-done exposition and images, Phil. Very nice comparisons.

I wish we had more of this kind of answer on this forum; good images of this or that to support a point are generally worth much more than mere verbal descriptions.
by wporter
Fri Jan 03, 2020 1:23 am
Forum: Pictures and Videos
Topic: Salt mix
Replies: 17
Views: 374

Re: Salt mix

Very dramatic, and nicely focused.
by wporter
Tue Dec 24, 2019 11:44 pm
Forum: For forum members who want to buy and sell equipment
Topic: Olympus BH2 BHS UMA Nomarski DIC Metallurgical Microscope
Replies: 6
Views: 270

Re: Olympus BH2 BHS UMA Nomarski DIC Metallurgical Microscope

You might get a manual for this Zeiss and become familiar with the DIC components that are necessary, and then talk to the seller to make sure all of the components come with the scope. Oftimes sellers claim DIC, but half or all of the needed parts are defective or missing. It is highly desirable th...
by wporter
Mon Dec 23, 2019 6:26 pm
Forum: Beginner's corner
Topic: Does a DSLR adapter need a lens in it?
Replies: 38
Views: 1702

Re: Does a DSLR adapter need a lens in it?

Viewing eyepieces will also project a real image, and are not that different from projection eyepieces in that regard. This is easily confirmed by holding a ground glass screen or frosted slide above your normal (viewing) eyepiece; you will get a real image projected upon the screen. The real and vi...
by wporter
Fri Dec 20, 2019 12:39 am
Forum: Illumination Techniques
Topic: dIY DIC
Replies: 32
Views: 5084

Re: dIY DIC

The objectives marked 'DIC' don't have internal prisms, but rather have high-quality strain-free & occlusion-free optical glass. There is still a need for a prism external to and above the objective, and one below the objective. See the below page for a nice color graphic (Fig. 1) of a DIC optical s...
by wporter
Wed Dec 18, 2019 11:18 pm
Forum: Microscopes and optics
Topic: Urgent! Labovert Leitz - please advise!
Replies: 12
Views: 935

Re: Urgent! Labovert Leitz - please advise!

I don't need any of these parts at the moment; too much duplication of what I have already. Thanks for the heads-up, though.

Anyone else? Even though it's on Facebook Marketplace (which I guess is like Craigslist), the seller may package it up and ship it for a small sum.
by wporter
Wed Dec 18, 2019 2:59 am
Forum: Microscopes and optics
Topic: Urgent! Labovert Leitz - please advise!
Replies: 12
Views: 935

Re: Urgent! Labovert Leitz - please advise!

It might work; it has to fit properly. The Leitz stage for this scope looks just like an upright scope x-y stage, and in fact may be one.
by wporter
Tue Dec 17, 2019 10:01 pm
Forum: Specimens, samples and slides
Topic: Help to identify anomaly in blood.
Replies: 7
Views: 547

Re: Help to identify anomaly in blood.

I'm sorry, but we're not allowed to give medical diagnoses on this forum.

But it was nice knowing you, MicroBob.
by wporter
Tue Dec 17, 2019 7:27 pm
Forum: Specimens, samples and slides
Topic: Help to identify anomaly in blood.
Replies: 7
Views: 547

Re: Help to identify anomaly in blood.

Possibly an air bubble.
by wporter
Mon Dec 16, 2019 10:29 pm
Forum: Microscopes and optics
Topic: Urgent! Labovert Leitz - please advise!
Replies: 12
Views: 935

Re: Urgent! Labovert Leitz - please advise!

Laboverts are very nice scopes. They even have their own patent: US patent 4,619,503, which also covers the Fluovert (the fluorescence version). The idea was to make an inverted stand more like the usual upright scope, which would lessen confusion when moving back-and-forth between the two types. Th...
by wporter
Sat Dec 14, 2019 8:39 pm
Forum: Miscellaneous
Topic: Protist behavioral complexity
Replies: 8
Views: 770

Re: Protist behavioral complexity

Why on earth would a biologist think that single cells were "genetically programmed to respond uniformly to some stimulus"? Cells are well known to have a multitude of different receptors in their cell membranes. Depending on the effect of a variable stimulus on different types and/or different numb...
by wporter
Sat Dec 14, 2019 3:28 pm
Forum: Beginner's corner
Topic: Microscope -Avian Disease's
Replies: 9
Views: 664

Re: Microscope -Avian Disease's

I'm sure Apo will chime in, but from my perspective, 1) it looks like a nice scope, 2) you don't need DIC, probably limited application for bacteria, and may not be available for this scope and certainly not for your budget; 3) the scope is shown with B&L eyepieces; get yourself some AO eyepieces. A...
by wporter
Sat Dec 07, 2019 6:08 pm
Forum: Microscopes and optics
Topic: Neural lens paper
Replies: 1
Views: 232

Neural lens paper

by wporter
Thu Dec 05, 2019 7:23 pm
Forum: Microscopes and optics
Topic: Meaning of Red dot on a Leitz eyepiece?
Replies: 2
Views: 243

Re: Meaning of Red dot on a Leitz eyepiece?

High eyepoint eyepieces are generally meant for people who wear eyeglasses, so they don't bump their glasses into the eyelens of the eyepiece. The red dot seems to indicate a Leitz eyepiece that is best for photography; perhaps this means that it is a projective eyepiece (not for afocal), but there ...
by wporter
Thu Dec 05, 2019 12:35 am
Forum: Miscellaneous
Topic: Is there a recognised definition of ‘Microplastics’ ?
Replies: 5
Views: 333

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

"How can quantitative surveys of ‘Microplastics’ have any credibility ?" Why not? 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 th...
by wporter
Tue Nov 26, 2019 5:14 pm
Forum: Microscopes and optics
Topic: Ortholux tube lens
Replies: 5
Views: 785

Re: Ortholux tube lens

Thanks for the very comprehensive info, Dave P. I know many the later (1980s) 160mm TL Leitz scopes used FSA heads also, although they often had a dash with some additional letters, indicating particular models with different features. Is that when the the 42mm head mount came in? ( versus the earli...
by wporter
Sat Nov 23, 2019 3:13 pm
Forum: Beginner's corner
Topic: thinking out loud here - moral thoughts
Replies: 21
Views: 1222

Re: thinking out loud here - moral thoughts

If it makes you feel better, by all means return them to their original habitat. But realize that this action is for you, not them. In some manner this can be seen as symbolically honoring or respecting life, but it is probably only really meaningful to you, not so much to the microscopic critters. ...
by wporter
Thu Nov 21, 2019 10:43 pm
Forum: Illumination Techniques
Topic: Identifying asbestos
Replies: 25
Views: 2035

Re: Identifying asbestos

Another possible reference, from the esteemed McCrone Research Institute:

http://www.mccroneinstitute.org/v/90/as ... tification
by wporter
Sat Nov 16, 2019 8:35 pm
Forum: Miscellaneous
Topic: Unlocking Nature's Secrets: The Serengeti Rules:
Replies: 5
Views: 445

Re: Unlocking Nature's Secrets: The Serengeti Rules:

It is currently on PBS in the US. It is an outstanding production.
by wporter
Wed Oct 23, 2019 8:18 pm
Forum: Microscopes and optics
Topic: XY-table for Zeiss standard inverted metallurgical
Replies: 2
Views: 622

Re: XY-table for Zeiss standard inverted metallurgical

Well, they were pretty practical for what the scopes were mainly used for: scanning metallic surfaces. The rails and grooves were usually juiced up with a suitable grease so that the friction and stiction were not a big issue. The Invertoscope was also made with an x-y stage for trans-illumination. ...
by wporter
Mon Sep 23, 2019 10:10 pm
Forum: Digital processing
Topic: Change lighting on laptop
Replies: 6
Views: 2066

Re: Change lighting on laptop

Fn-F6 to lower, Fn-F7 to brighten does not work? Sometimes there is a delay until the actual change...
by wporter
Thu Sep 12, 2019 6:06 pm
Forum: Microscopes and optics
Topic: B&L Balplan/Microzoom II light path selector
Replies: 9
Views: 1459

Re: B&L Balplan/Microzoom II light path selector

That is a mounting point for one end of a toggle spring, that provides the two positive setpoints for the prism position, i.e., in the light path or out of the light path. Yours is missing, which is OK, as the lever and prism will still work; they just aren't held in the in or out position very well...
by wporter
Thu Sep 12, 2019 1:39 am
Forum: Microscopes and optics
Topic: B&L Balplan/Microzoom II light path selector
Replies: 9
Views: 1459

Re: B&L Balplan/Microzoom II light path selector

No, just a prism moves with the lever.

Where exactly is this threaded boss?
by wporter
Mon Sep 09, 2019 3:25 pm
Forum: Identification help
Topic: Is this real?
Replies: 11
Views: 2866

Re: Is this real?

Floaters should be easy to distinguish from other FOV phenomenon. If you jerk your eye's point-of-focus to the side, the typical floater should lag a bit, i.e., not move as much as the jerk, but after a second or so, "catch up", and slide back to near the center of the field (at least the especially...
by wporter
Sat Sep 07, 2019 2:03 am
Forum: Beginner's corner
Topic: immersion oil question
Replies: 9
Views: 1235

Re: immersion oil question

I would think that the oil, especially if it eventually spreads out to form a sheen or layer, would probably negatively impact the air-water gaseous exchange rate or process.
by wporter
Sat Sep 07, 2019 1:45 am
Forum: For forum members who want to buy and sell equipment
Topic: Zeiss Universal for sale
Replies: 8
Views: 1577

Re: Zeiss Universal for sale

The protrusion is a 3-layer slide holding multiple filters.
by wporter
Wed Jun 26, 2019 3:45 pm
Forum: Microscopes and optics
Topic: Microscope storage temperature
Replies: 15
Views: 1824

Re: Microscope storage temperature

I don't think a differential thermal expansion is a problem, unless you put the microscope in an oven or other source of high heat. The bigger problem for scopes is high humidity, causing fungal growth on the glass surfaces. Some people in tropical climes use enclosures with dehumidification in whic...
by wporter
Sat Jun 22, 2019 2:00 pm
Forum: Microscopes and optics
Topic: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?
Replies: 35
Views: 4297

Re: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?

So, I will try black paint, perhaps it will help some. Carefully of course. Need to verify that the paint is compatible with immersion oil. Good point; I now retract my suggestion to use hobby paint, unless it claims to be oil-resistant. Radio-controlled airplane paint might work, if for use on pla...
by wporter
Sat Jun 22, 2019 12:25 am
Forum: Microscopes and optics
Topic: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?
Replies: 35
Views: 4297

Re: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?

I'm not sure if it makes a lot of difference what paint you use, but you might go to a hobby shop and get a small jar of flat black paint that modelers use on model planes and trains. Clean the surface with acetone, and stroke gently with a modeler's paintbrush upwards along the outside of the frust...