Search found 130 matches

by carlh6902
Thu Oct 29, 2020 12:12 am
Forum: For forum members who want to buy and sell equipment
Topic: Looking for Olympus Photomicro Adapter L
Replies: 12
Views: 732

Re: Looking for Olympus Photomicro Adapter L

This isn't really relevant to this discussion, but I'll add this little tidbit here, just so that any future searchers have a chance to see it. The Photomicro L Adapter has the proper bore to accept the NFK projection optics, but the U-SPT (UIS version) does not. The bore is bigger in the UIS one, a...
by carlh6902
Tue Oct 27, 2020 3:59 am
Forum: Microscopy accessories
Topic: Olympus Polarizing Centerable Microscope Nosepiece PN: U-P4RE
Replies: 2
Views: 294

Re: Olympus Polarizing Centerable Microscope Nosepiece PN: U-P4RE

A typical polarizing nosepiece has one fixed, and the remainder centerable. The fixed one is the "reference", and the remainder are adjusted to match the fixed reference.

Carl
by carlh6902
Sat Sep 19, 2020 1:27 am
Forum: For forum members who want to buy and sell equipment
Topic: Looking for NFK 2.5x LD relay lens and Olympus OM L phototube
Replies: 24
Views: 974

Re: Looking for NFK 2.5x LD relay lens and Olympus OM L phototube

The WHK15 eyepieces will sit properly in the recess. Works well for afocal shooting.

Carl
by carlh6902
Fri Aug 21, 2020 1:42 am
Forum: Microscopes and optics
Topic: Phase Telescope with reticle
Replies: 3
Views: 506

Re: Phase Telescope with reticle

Thanks for the replies. For those curious, Olympus used a similar device to look into the light inlet port of the BHS scope, to collimate the substage lighting and field diaphragm.

Carl
by carlh6902
Wed Aug 19, 2020 4:58 am
Forum: Microscopes and optics
Topic: Phase Telescope with reticle
Replies: 3
Views: 506

Phase Telescope with reticle

Has anybody ever tried to add a reticle, such as a crosshatch, to a phase centering telescope?

Carl
by carlh6902
Fri Aug 07, 2020 3:20 am
Forum: Microscopes and optics
Topic: CHA Tension Adjustment
Replies: 10
Views: 1223

Re: CHA Tension Adjustment

See the PDFs in this folder. They apply to the BH2. https://drive.google.com/folderview?id=1M-393MVEJgEnoeyDOt_yWt9o8SWUOcys I use mineral spirits and acetone for the metal parts. Acetone on the nylon washers. Don't use IPA on them, it will swell the nylon. Also, IPA can make white blotches on the b...
by carlh6902
Thu Aug 06, 2020 2:43 pm
Forum: Microscopes and optics
Topic: CHA Tension Adjustment
Replies: 10
Views: 1223

Re: CHA Tension Adjustment

Very possibly your scope should have a complete teardown. But then again, how many 30 plus year old scopes don't? As you can see in the Part 2 video, when I removed the tension adjustment knob, the grease inside was nearly solid. Yours is no doubt the same, and that's why you can"t turn it. There is...
by carlh6902
Wed Aug 05, 2020 2:45 am
Forum: Microscopes and optics
Topic: CHA Tension Adjustment
Replies: 10
Views: 1223

Re: CHA Tension Adjustment

Those old CH scopes have a very similar coaxial focus mechanism to the Olympus BH2 scopes. I recently put a few videos on YouTube (search for my name, and you should find them). If you watch part 2 in the series, you will see why your tension knob was so hard to turn! You will also want it cleaned a...
by carlh6902
Thu Jul 30, 2020 4:35 am
Forum: My microscope
Topic: Olympus BH-2 BHS
Replies: 10
Views: 1540

Re: Olympus BH-2 BHS

The issue with the diopter ring running out of range on the left side could be due to an improper tube length on the right side. That does look like a nice scope! The worn gear can be purchased third party in the US.

Carl
by carlh6902
Mon Jul 27, 2020 2:38 am
Forum: Resources (online, books etc.)
Topic: Microscopy FAQ
Replies: 13
Views: 2068

Re: Microscopy FAQ

Just search my name, you should see them. One of these days, I will set up real lighting and do a better job.

Carl Hunsinger
by carlh6902
Mon Jul 27, 2020 2:36 am
Forum: Resources (online, books etc.)
Topic: Microscopy FAQ
Replies: 13
Views: 2068

Re: Microscopy FAQ

Just search my name, you should see them.

Carl Hunsinger
by carlh6902
Sun Jul 26, 2020 5:52 am
Forum: Resources (online, books etc.)
Topic: Microscopy FAQ
Replies: 13
Views: 2068

Re: Microscopy FAQ

Glad to see somebody finds this useful! I haven't written much lately, but have made a few poor-quality BH2 videos for YouTube.
by carlh6902
Mon Jul 13, 2020 3:30 am
Forum: Microscopes and optics
Topic: Amscope 20x eyepieces....decent??
Replies: 8
Views: 729

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: 1455

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: 4463

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: 478

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: 3461

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: 7
Views: 1777

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: 2508

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: 1716

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: 1419

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: 1419

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: 6469

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: 1088

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: 4358

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: 3461

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: 3461

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