Search found 283 matches

by wporter
Mon Nov 26, 2018 10:46 pm
Forum: Beginner's corner
Topic: Using metallurgical microscope for Plane Polarized Transmission images?
Replies: 9
Views: 1866

Re: Using metallurgical microscope for Plane Polarized Transmission images?

Absolutely you can do that. Just arrange the new light as you suggested, focus on your subject, and then place the polarizer on top of the light, and rotate it. If it is a circular polarizing filter, such as used with digital cameras, you may have to flip it upside down if you don't get any crossed-...
by wporter
Thu Nov 22, 2018 4:10 pm
Forum: For forum members who want to buy and sell equipment
Topic: Hand Microtome -- SurplusShed Sale
Replies: 1
Views: 918

Re: Hand Microtome -- SurplusShed Sale

I have one of these, paid the higher amount some years ago. Very well made, solid stainless. At the new price, a killer deal. Just so you know, the click stops are definite; that is, there is little or no ability to set the dial between the click stops to 'interpolate' a thickness increment of say 1...
by wporter
Wed Nov 21, 2018 5:47 pm
Forum: Beginner's corner
Topic: Can't focus phase contrast kit
Replies: 7
Views: 1934

Re: Can't focus phase contrast kit

As you, and the others here, have pointed out, the instructions in your manual leave something to be desired. To rehash the other good advice, if I was to re-write the manual, I'd make the following changes: A) Go to manual page 15, section 8.1. Do steps 1) and 2). B) Then, for manual step 3), subst...
by wporter
Sat Nov 17, 2018 5:05 pm
Forum: Microscopy accessories
Topic: Question about reticle size
Replies: 3
Views: 2937

Re: Question about reticle size

Is the proposed reticle mounted in a threaded cell, or do you asking about a reticle disk that is held in the eyepiece bore with a separate retaining ring? I have a 518059 Periplan GF 10x/20/glasses-icon, which has a threaded bore with an I.D. of about 21.35 mm. A reticle glass disk of 20.95 mm will...
by wporter
Wed Nov 14, 2018 8:03 pm
Forum: Resources (online, books etc.)
Topic: Zeiss Standard GFL manual
Replies: 2
Views: 1728

Re: Zeiss Standard GFL manual

Thanks for posting this manual. It has interesting and useful differences from other ones I've seen.
by wporter
Fri Nov 09, 2018 3:06 am
Forum: Camera systems and imaging
Topic: Halo with reflex
Replies: 8
Views: 5509

Re: Halo with reflex

Sometimes the illumination is wonky if a very low power (1x to 5x) objective is used, so many condensers have provisions for these low-powers: the top lens of the condenser can be flipped out of the way; the top lens can be unscrewed and placed aside temporarily; or and under-condenser auxiliary len...
by wporter
Tue Nov 06, 2018 7:56 pm
Forum: Microscopes and optics
Topic: Paining the micro Stage?
Replies: 10
Views: 1453

Re: Paining the micro Stage?

I've had great results redoing old stage-tops by painting with an auto engine enamel, specifically Dupli-Color's Engine Enamel with Ceramic, in semi-gloss black #DE1635 (although the color is obviously a matter of taste). I'm in the U.S., and it's about $8.00 a spray can. It dries fast, and is slick...
by wporter
Tue Nov 06, 2018 7:41 pm
Forum: Microscopes and optics
Topic: What is this?
Replies: 6
Views: 1178

Re: What is this?

It's a theodolite, for measuring angles in surveying. Nothing to do with microscopes.
by wporter
Mon Nov 05, 2018 9:47 pm
Forum: Illumination Techniques
Topic: The Next Big Thing, or, Back To The Future
Replies: 5
Views: 2525

The Next Big Thing, or, Back To The Future

OK, ditch all of those pathetic little light sources: XBOs, HBOs, halogen, and especially those weak-kneed, new-fangled LED things! Below is the microscope light you all have been waiting for, languishing somewhere in an antique vendor's back room: https://www.ebay.com/itm/VINTAGE-BAUSCH-LOMB-MICROS...
by wporter
Fri Nov 02, 2018 3:14 pm
Forum: Illumination Techniques
Topic: Stereo Microscope : Fluorescence Adapter
Replies: 43
Views: 9734

Re: Stereo Microscope : Fluorescence Adapter

Older microscopes (Leitz Ortholux, Reichert Univar, etc) that featured transmitted-light fluorescence mostly had the excitation filter at the lamp housing, and no dichroic, just a (yellowish) barrier filter slid into a slot somewhere between the objective and the viewing head.
by wporter
Thu Nov 01, 2018 8:59 pm
Forum: Illumination Techniques
Topic: Stereo Microscope : Fluorescence Adapter
Replies: 43
Views: 9734

Re: Stereo Microscope : Fluorescence Adapter

You're right to call for DIYers, that's a very expensive setup! Nice, though. If one wants to experiment for VERY cheap, I have used a $5 (but pretty bright) Chinese-made LED UV flashlight. It puts out @ 365nm, fine for say, DAPI, or any of the common fluorescent things around the house: paper, drie...
by wporter
Thu Nov 01, 2018 2:14 pm
Forum: My microscope
Topic: Can anyone identify this model?
Replies: 11
Views: 5511

Re: Can anyone identify this model?

Apo did indeed nail it. Here's an ad from Science, 17 Nov 1972:
by wporter
Sat Oct 27, 2018 2:11 pm
Forum: Specimens, samples and slides
Topic: Phase contrast mounting kit
Replies: 5
Views: 2280

Re: Phase contrast mounting kit

Me, too.

Perhaps one of our German-speakers can tell us what's on the labels.
by wporter
Sat Oct 27, 2018 2:08 pm
Forum: Illumination Techniques
Topic: Bausch&Lomb PR-27 microscopy lamp with ribbon filament lamp
Replies: 29
Views: 6794

Re: Bausch&Lomb PR-27 microscopy lamp with ribbon filament lamp

Here's an image of the older illuminator that Apochronaut was talking about, the 31-33-85 research model: research illuminator 31-33-85.png From the ebay listing, https://www.ebay.com/itm/BAUSCH-LOMB-CO-RESEARCH-MICROSCOPE-LAMP-31-33-85-WITH-TRANSFORMER-WORK-WELL/113257205454?hash=item1a5ea7cece:g:p...
by wporter
Mon Oct 22, 2018 4:33 pm
Forum: My microscope
Topic: Bausch & Lomb StereoZoom ?
Replies: 14
Views: 4656

Re: Bausch & Lomb StereoZoom ?

What microscope are these shields to?:

https://www.ebay.com/itm/Bausch-Lomb-st ... :rk:2:pf:0
by wporter
Mon Oct 22, 2018 2:39 pm
Forum: Illumination Techniques
Topic: Darkfield photography
Replies: 28
Views: 10157

Re: Darkfield photography

YOU DON'T KNOW YOUR BUTT FROM A HOLE IN THE GROUND.. STOP BEING A GROUCHY OLD MAN AND LET FOLKS EXPERIMENT WITH WHAT THEY WANT... Whoa, let's just simmer down. There is no reason for ad hominem attacks. There is plenty of room regarding this subject (LED lighting) for personal taste and opinions, w...
by wporter
Thu Oct 18, 2018 4:46 pm
Forum: Digital processing
Topic: Measureing Software
Replies: 8
Views: 8730

Re: Measureing Software

Good info, Brad_.

And here's a quick tutorial on putting a scale bar into an image:

https://www.swarthmore.edu/NatSci/nkaplin1/scalebar.htm
by wporter
Thu Oct 18, 2018 1:51 pm
Forum: Camera systems and imaging
Topic: Opinion on this micro 4/3 adaptor please
Replies: 10
Views: 12728

Re: Opinion on this micro 4/3 adaptor please

Zzffnn raises a good point. By using only the cheap adapter I linked to, you may be losing some correction that would be provided by an eyepiece or a photo projection lens. I haven't done any imaging tests with my adapter, since I just got it myself (but that will be on my worklist). The image on th...
by wporter
Thu Oct 18, 2018 1:36 pm
Forum: Collecting microscopes and slides
Topic: Recommend grease?
Replies: 42
Views: 14004

Re: Recommend grease?

Personally, I'm not sure why a silicone based grease would be more likely to get all over anything than any other grease. You're probably right. I guess what I don't like about silicone-based lubes is the persistent slick feel, even after wiping off with a rag, say (though the silicone feel can be ...
by wporter
Thu Oct 18, 2018 12:30 am
Forum: Camera systems and imaging
Topic: Opinion on this micro 4/3 adaptor please
Replies: 10
Views: 12728

Re: Opinion on this micro 4/3 adaptor please

No, it does not work for me, either (hovering the camera). But just pop on the adapter & drop into the eyepiece tube and you get a good image (though it's not perfectly parfocal with the remaining eyepiece). I think it may have to do with the camera's electronics needing a lens or adapter screwed on...
by wporter
Wed Oct 17, 2018 10:51 pm
Forum: Camera systems and imaging
Topic: Opinion on this micro 4/3 adaptor please
Replies: 10
Views: 12728

Re: Opinion on this micro 4/3 adaptor please

I don't think that you need an adapter with a lens. Here's the one I use for eyepiece-tube imaging, and it works great on a BH2: flat-field, no vignetting,etc. Worth trying out at the price, anyway: https://www.ebay.com/itm/23-2mm-Microscope-Adapter-Tube-T-Ring-for-Olympus-Panasonic-Micro-4-3-Camera...
by wporter
Wed Oct 17, 2018 8:41 pm
Forum: Collecting microscopes and slides
Topic: Recommend grease?
Replies: 42
Views: 14004

Re: Recommend grease?

Does anyone have experience with Dow Corning Molykote 7348 for the mechanical stage X-Y motion or condenser focusing rails ? No, but I personally would stay away from silicone oils or greases for anything around optical equipment, since it gets everywhere and pretty soon your equipment has that sli...
by wporter
Sat Oct 13, 2018 4:57 pm
Forum: Microscopy accessories
Topic: Cotton rolls for lens cleaning?
Replies: 6
Views: 2889

Re: Cotton rolls for lens cleaning?

The manner of using - gently, sparingly etc - may count more than the specific brand of cleaner... I agree with that completely. Proper technique counts for a lot. I think that the photographic field is to blame for much of this angst. There is a certain percentage of photographers that mistreat th...
by wporter
Thu Oct 11, 2018 2:29 pm
Forum: Pictures and Videos
Topic: strumigenys eggersi
Replies: 19
Views: 2569

Re: strumigenys eggersi

unfortunately, I too have ant colonies. one is in the beam over my workbench in the driveshed and the other in the beam in the pantry/woodhouse area of the farm house. would you like some? If they are in the beams, they may have displaced and destroyed termite colonies; if so, this would come under...
by wporter
Sat Oct 06, 2018 6:18 pm
Forum: Microscopes and optics
Topic: Inverted microscope vs upright microscope
Replies: 21
Views: 4171

Re: Inverted microscope vs upright microscope

I agree with KurtM regarding the great ease of use of an inverted microscope for certain applications. I, too, find it amazingly fast and much more 'ergonomic' to use when examing pond samples and spending a fair amount of time scanning the sample for activity, interactions, and other ecological mat...
by wporter
Wed Oct 03, 2018 1:56 pm
Forum: Microscopes and optics
Topic: Enamel Care
Replies: 7
Views: 1786

Re: Enamel Care

I' ve found that the most innocuous solvent is (with the somewhat ambiguous name) what we call in the U.S. 'petroleum naphtha', commonly available as Coleman Camp Fuel or lighter fluid. It helps to remove stickers and their gooey deposits (not to mention grease and oil) yet doesn't seem to attack fi...
by wporter
Sat Sep 29, 2018 9:51 pm
Forum: Microscopy accessories
Topic: Nikon accessories of some sort (look like weird eyepieces?)
Replies: 4
Views: 2164

Re: Nikon accessories of some sort (look like weird eyepieces?)

They look like phase telescopes to me, too. If you substitute one for an eyepiece, and turn the focusing part in and out, do you see it progressively focusing on various parts of the optical train (objective innards, the condenser iris, etc.) ? If they are, and work pretty well, you may be able to u...
by wporter
Fri Sep 28, 2018 11:44 am
Forum: Beginner's corner
Topic: Old brand microscope vs new less famous brand microscope
Replies: 8
Views: 2170

Re: Old brand microscope vs new less famous brand microscope

Although it depends on your use of the microscope (cutting edge research? personal hobby use?), and how much money you want to spend, many on this forum would recommend the older microscopes as being superior in the benefit per cost sense. The computer analogy is specious. Computer technology has pr...