Search found 117 matches

by carlh6902
Mon Jul 13, 2020 3:30 am
Forum: Microscopes and optics
Topic: Amscope 20x eyepieces....decent??
Replies: 8
Views: 124

Re: Amscope 20x eyepieces....decent??

Amscope eyepieces of any magnification are a poor choice for your BH2. The Olymous LB objectives on the BH2 provide an unfinished intermediate image, and rely on matching Olympus WK, WHK, or SWHK eyepieces to provide a fully corrected image for viewing. Now, as for 20x eyepieces, you're now getting ...
by carlh6902
Fri May 29, 2020 1:18 am
Forum: Home-made microscope adaptations
Topic: LED Conversion of a BH2 Trinocular
Replies: 8
Views: 416

Re: LED Conversion of a BH2 Trinocular

Just out of curiosity, why are you switching to LED lighting?
by carlh6902
Mon May 25, 2020 9:10 pm
Forum: For forum members who want to buy and sell equipment
Topic: Wanted: Olympus NFK 1.67x or NFK 2.5x
Replies: 24
Views: 2858

Re: Wanted: Olympus NFK 1.67x or NFK 2.5x

An average price for an nfk2.5 is $135 or so. An average price for the 1.67 is $600. Too high? That's the market price.

Carl
by carlh6902
Mon May 25, 2020 4:32 am
Forum: For forum members who want to buy and sell equipment
Topic: Resale Value of a used BH2 Trinocular Microscope
Replies: 1
Views: 202

Re: Resale Value of a used BH2 Trinocular Microscope

I think it could fetch $900 on ebay, if it's working well.

Carl
by carlh6902
Wed Apr 08, 2020 3:31 am
Forum: Beginner's corner
Topic: Kohler Trouble
Replies: 40
Views: 1814

Re: Kohler Trouble

The BHS has a tremendous amount of light. Your options for not obliterating your retinas are: 1) Turn the intensity down. It will likely be way below the "recommended" setting. That setting is (I believe) only appropriate with a neutral density filter in the system. 2) Add a neutral density filter i...
by carlh6902
Sun Apr 05, 2020 1:42 am
Forum: My microscope
Topic: My little Olympus BH-2 BHT
Replies: 6
Views: 759

Re: My little Olympus BH-2 BHT

Welcome Joe!

Carl
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: 1871

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: 1101

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: 942

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: 942

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: 12
Views: 5247

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: 746

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: 3547

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: 3138

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: 3138

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: 3138

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: 1299

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: 8827

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: 8827

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: 7012

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: 5255

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: 3496

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: 3496

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: 3496

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: 3496

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: 3496

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: 3496

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