Search found 110 matches

by carlh6902
Mon Jan 20, 2020 12:13 am
Forum: Microscopes and optics
Topic: S Plan 40x on BH-2 BHS Light field/Dark field
Replies: 19
Views: 238

Re: S Plan 40x on BH-2 BHS Light field/Dark field

Thomas,

What are you using to obtain darkfield? A simple patch stop, and likely even a dedicated dry darkfield condenser, will not give optimal results at 40x. A wet (oiled) darkfield condenser should work well.

Carl
by carlh6902
Mon Jan 13, 2020 5:06 pm
Forum: Microscopes and optics
Topic: BH-2 Focus adjustment question
Replies: 16
Views: 197

Re: BH-2 Focus adjustment question

If the focus is stiff, and especially if it has noticeable hysteresis, then the grease is thickened and the scope needs service. This folder contains two PDFs that describe how to fix the focus mechanism:

https://drive.google.com/open?id=1bUoWP ... XsLG0HW34d

Carl
by carlh6902
Fri Jan 10, 2020 1:01 am
Forum: Microscopes and optics
Topic: BHS Voltage
Replies: 14
Views: 221

Re: BHS Voltage

The circuit on A-12 is the 20W bht/bhtu version. It is built with one of two different transformers, just like the two bhs versions. One is wound for 110v and the other one is wound for 220v operation. The schematic just shows the two optional part numbers. The switch nearby is for operation at 10% ...
by carlh6902
Fri Jan 10, 2020 12:28 am
Forum: Microscopes and optics
Topic: BHS Voltage
Replies: 14
Views: 221

Re: BHS Voltage

That scope was made for north america and cannot be converted for 220v.

This pdf shows whats in there:

https://drive.google.com/open?id=16d-or ... qfZomsScdv

Carl
by carlh6902
Wed Dec 25, 2019 8:23 pm
Forum: My microscope
Topic: What Microscope do I use.
Replies: 8
Views: 363

Re: What Microscope do I use.

To get the true benefit of a 100x oil immersion lens of NA 1.25, you will need to oil the condenser to the slide, as well as the objective.

Carl
by carlh6902
Mon Dec 23, 2019 11:19 pm
Forum: Microscopes and optics
Topic: Olympus BH2 eye pieces
Replies: 6
Views: 284

Re: Olympus BH2 eye pieces

Olympus WK and WHK eyepieces provide compensation for residual chromatic aberration (color fringing) of the Olympus LB objectives. Without these eyepieces, LB objectives will create noticeable lateral chromatic aberration. These eyepieces are a poor match for Nikon and Zeiss optics. You should go wi...
by carlh6902
Fri Nov 29, 2019 7:01 am
Forum: Beginner's corner
Topic: thinking out loud here - moral thoughts
Replies: 21
Views: 1243

Re: thinking out loud here - moral thoughts

One way to look at it if you return them, you could kill more trudging to the water and back to release them, than are in the test tube. One thing you can do is put them in a jar, add some chlorine-free water to top it up. Add a few decaying leaves, and a few grains or rice and very now and again, a...
by carlh6902
Tue Sep 17, 2019 2:50 am
Forum: For forum members who want to buy and sell equipment
Topic: Much Stuff For Sale - Everything Must Go!
Replies: 7
Views: 2399

Re: Much Stuff For Sale - Everything Must Go!

PeteM,

Great idea. I could fit a dozen in the space of the stove, easily. It's outta' here...

Carl
by carlh6902
Tue Sep 17, 2019 2:38 am
Forum: For forum members who want to buy and sell equipment
Topic: Much Stuff For Sale - Everything Must Go!
Replies: 7
Views: 2399

Re: Much Stuff For Sale - Everything Must Go!

So now I'm seeing an egg, sunny side up, on the heated stage. It could work!

Carl
by carlh6902
Mon Sep 16, 2019 3:52 pm
Forum: For forum members who want to buy and sell equipment
Topic: Much Stuff For Sale - Everything Must Go!
Replies: 7
Views: 2399

Much Stuff For Sale - Everything Must Go!

Over the past seven or eight years, I have been an avid microscopy hobbyist. My interests have been primarily focused on Olympus scopes, especially the BH-2 line. I have devoted a great deal of time to collecting (some would say hoarding) and learning to repair and restore these microscopes. This ho...
by carlh6902
Fri Aug 16, 2019 2:11 am
Forum: For forum members who want to buy and sell equipment
Topic: Found: Olympus SWK10 Eyepiece
Replies: 0
Views: 844

Found: Olympus SWK10 Eyepiece

:mrgreen: Looking for a single Olympus SWK 10 ocular.

Carl

Thanks all. I have found this item. Thanks Chris!
by carlh6902
Tue Jul 02, 2019 11:31 pm
Forum: Beginner's corner
Topic: Darkfield - is resolution lost?
Replies: 62
Views: 5579

Re: Darkfield - is resolution lost?

Darkfield is inherently lower resolution than brightfield, and also is not a faithful representation of the specimen image, due to the loss of the zero-order light in the fourier-reconstructed (via interference) final image. Carl I should have been more clear in what I was trying to say. True, the ...
by carlh6902
Mon Jul 01, 2019 1:38 am
Forum: Beginner's corner
Topic: Darkfield - is resolution lost?
Replies: 62
Views: 5579

Re: Darkfield - is resolution lost?

Darkfield is inherently lower resolution than brightfield, and also is not a faithful representation of the specimen image, due to the loss of the zero-order light in the fourier-reconstructed (via interference) final image. At highest power, the objective NA must in practice be limited either by an...
by carlh6902
Mon May 27, 2019 6:58 pm
Forum: About the website, the magazine and this forum
Topic: Darkfield using Olympus BH2/BHS
Replies: 4
Views: 5158

Re: Darkfield using Olympus BH2/BHS

sombre wrote:Many thanks to all for the help and suggestions.
I think I will go down the diy route until such times as I can find the correct condenser etc:
Again many thanks.

Sombre

There is a seller on eBay selling a nice system that works with the standard BH2-CD abbe condenser. Check it out.

Carl
by carlh6902
Mon Jan 07, 2019 5:32 am
Forum: Microscopes and optics
Topic: Olympus BH-2 Question. Lamp intensity adjuster. Faulty?
Replies: 17
Views: 4763

Re: Olympus BH-2 Question. Lamp intensity adjuster. Faulty?

I have released another significant update to this document. It now includes a comprehensive troubleshooting section, complete with flowcharts. It went from 22 to 34 pages. Carl Edit 4/14/2019: Replaced outdated link with a link to the master index, which always contains the most recent versions: ht...
by carlh6902
Sun Dec 30, 2018 9:07 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2842

Re: Looking for parts for Microstar IV

Wow Bill,

Thanks for the excellent post!

Carl
by carlh6902
Thu Dec 27, 2018 2:26 am
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2842

Re: Looking for parts for Microstar IV

The thing barely gets out of the light path as it is. If the OD were much bigger, it probably wouldn't.

Carl
by carlh6902
Thu Dec 27, 2018 1:50 am
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2842

Re: Looking for parts for Microstar IV

Yes, heat resistance would be the problem with 3D printing. Maybe some of the uv curable resins would be up to the task, but I don't know. Now that I know that I'm not likely to find exact replacement, I may pull the bottom back off and have anoth look. I may just be able to cement a larger disk on ...
by carlh6902
Wed Dec 26, 2018 11:41 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2842

Re: Looking for parts for Microstar IV

wporter, Yes, that is exactly the part! The plastic gets well blasted with heat from the 20W lamp. The carrier was broken in half, so I concur it's a fragile part. I have it epoxied back together with JB Weld, so it might work. But I don't have the filter either. Please let me know if you are able t...
by carlh6902
Wed Dec 26, 2018 11:29 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2842

Re: Looking for parts for Microstar IV

Apochronaut, Right between the 7388 Esb lamp and the diffuser in the lamp inlet optics, there is a filter holder that swings in and out, as controlled by the "blue" knob on the front. The blue filter is missing , and the plastic holder is broken. There is also a neutral density filter, after the inl...
by carlh6902
Wed Dec 26, 2018 9:32 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking for parts for Microstar IV
Replies: 17
Views: 2842

Looking for parts for Microstar IV

I'm looking for a few parts to complete my Reichert era Microstar IV. I need the blue filter, and if possible, the swing out carrier for this filter, that's in the base of the unit. Please PM me if you have these parts.

Carl
by carlh6902
Sun Dec 09, 2018 10:04 pm
Forum: Off Topic
Topic: Anyone see their microscope 'in the movies'?
Replies: 6
Views: 3306

Re: Anyone see their microscope 'in the movies'?

In "The Last Man On Earth", Vincent price is a researcher, using a 6-inch toy microscope at home. It's funny to watch him hunch down and peer into the little toy. As the last man on earth, will full run of the town by daylight, he could certainly find a real one. I'm just saying.

Carl
by carlh6902
Fri Dec 07, 2018 2:53 am
Forum: Off Topic
Topic: Anyone see their microscope 'in the movies'?
Replies: 6
Views: 3306

Re: Anyone see their microscope 'in the movies'?

Hi all, I would expect to encounter really vintage stands as set props in movie scenes evoking a lone scientist in the laboratory, 19th century plot times. But I just encountered my Nikon-Labophot Pol stand in a recent "B" movie with major film stars! There my stand 'acts scientific' as the main se...
by carlh6902
Sun Nov 18, 2018 4:38 am
Forum: Pictures and Videos
Topic: The elusive Amoeba
Replies: 3
Views: 897

Re: The elusive Amoeba

My quest for the elusive amoeba is described in My Story linked here:

Edit 4/14/2019: Replaced outdated link with a link to the master index, which always contains the most recent versions:

https://drive.google.com/open?id=0B7ckZ ... nFYVDJSRW8

Carl
by carlh6902
Sun Nov 18, 2018 3:37 am
Forum: Pictures and Videos
Topic: Malic Acid crystal explorations in polarized light [Large file warning]
Replies: 10
Views: 1985

Re: Malic Acid crystal explorations in polarized light [Large file warning]

Evan,

Those sure truly some nice images. Tell us about the setup you used for these polarizing images. How did you outfit your BHTU to take these?

Carl
by carlh6902
Wed Jul 25, 2018 4:42 am
Forum: Illumination Techniques
Topic: Nikon Dark field stop on ebay. Anyone familiar with these?
Replies: 8
Views: 2374

Re: Nikon Dark field stop on ebay. Anyone familiar with these?

This was in Microbehunter issue #54:


Edit 4/14/2019: Replaced outdated link with a link to the master index, which always contains the most recent versions:

https://drive.google.com/open?id=0B7ckZ ... nFYVDJSRW8

Carl
by carlh6902
Tue May 22, 2018 3:46 pm
Forum: Microscopes and optics
Topic: Question on Olympus BH-2
Replies: 29
Views: 6902

Re: Question on Olympus BH-2

Sorry, I was too vague. I meant to say there are coarse-focus tension rings on some scopes, like Nikon Labophot 2, which you can unlock. But twisting coarse focus knobs against each other, on some scopes, such as a Nikon inspection scope, will damage focus mechanisms beyond repair. Sorry to resurre...
by carlh6902
Mon Feb 12, 2018 3:35 am
Forum: Beginner's corner
Topic: Is this normal for objective lenses?
Replies: 7
Views: 1128

Re: Is this normal for objective lenses?

Lilly, just make sure you don't ever get oil on any of the other objectives. They can be ruined by the oil.

Carl