Search found 861 matches

by PeteM
Sat Mar 28, 2020 9:47 pm
Forum: Microscopy accessories
Topic: What is it? Marker?? Oiler??
Replies: 6
Views: 118

Re: What is it? Marker?? Oiler??

The pen and sampler ideas both seem possibilities, thanks. As a Rapidograph-like pen, it's missing the needle and weight. Still could be. Having entered my seventh decade, Bob, I still have Rapidograph pens, Kodak Carousel projectors, and the like still around. Just got rid of the Teac reel to reel ...
by PeteM
Sat Mar 28, 2020 8:31 pm
Forum: Microscopes and optics
Topic: 40x SPlan woes
Replies: 13
Views: 296

Re: 40x SPlan woes

FWIW, it used to be that the batteries in Mitutoyo digital micrometers and calipers would last one or two years, while those in Chinese knock-offs might be gone in a month. Mitutoyo took great care to have low drain circuits, automatic shut-off etc. Just a look at the circuit boards also showed a tr...
by PeteM
Sat Mar 28, 2020 8:21 pm
Forum: Beginner's corner
Topic: Amscope T720 vs. Swift SW380T
Replies: 8
Views: 135

Re: Amscope T720 vs. Swift SW380T

The frames, optics, and head are pretty clearly different. Given there are scores of optical companies in China and at least half a dozen major producers, hard to know if the scopes came out of the same factory IMO. I've had a couple used objectives that look like those on the Swift scope. The 40x w...
by PeteM
Sat Mar 28, 2020 7:28 pm
Forum: Microscopes and optics
Topic: Seeking selection advice for stereo microscope
Replies: 22
Views: 286

Re: Seeking selection advice for stereo microscope

After considering everyone's input, I think I am going to try and acquire an AO Cycloptic and see how things go. By reports it seems to fit most of my requirements, but more importantly it will give me a chance to find out what I actually need without inordinate expense. Then, once I've managed to ...
by PeteM
Sat Mar 28, 2020 4:37 am
Forum: Microscopy accessories
Topic: What is it? Marker?? Oiler??
Replies: 6
Views: 118

Re: What is it? Marker?? Oiler??

Were it now for the trouble someone took to send this out for chrome plating after machining and knurling the brass body, it might be a shop-made one of a kind.

I've never seen an RMS thread on a hose fitting. So, still a mystery . . .?
by PeteM
Sat Mar 28, 2020 3:13 am
Forum: Microscopy accessories
Topic: What is it? Marker?? Oiler??
Replies: 6
Views: 118

What is it? Marker?? Oiler??

This RMS-threaded object recently came to me. It has a sort of blunted hypodermic needle that communicates to a very small cavity at the back. It is open and would leak, but is threaded so there might be a plug. With a plug installed there would be only a few cubic mm of volume left. By means of the...
by PeteM
Fri Mar 27, 2020 11:05 pm
Forum: Illumination Techniques
Topic: Zeiss DIC slider
Replies: 9
Views: 171

Re: Zeiss DIC slider

If you're planning to adapt multiple objectives, something like the carcass from an Olympus MPlan DIC prism (minus the prism) could be an option? I've seen these as low as $10 and have a few myself: https://www.ebay.com/itm/Olympus-50x-DIC-Prism-for-MS-Plan-50x-Infinity-BH2-NIC-50x/184197675596?hash...
by PeteM
Fri Mar 27, 2020 7:46 pm
Forum: Illumination Techniques
Topic: Zeiss DIC slider
Replies: 9
Views: 171

Re: Zeiss DIC slider

I vaguely recall 16mm wide for the wave plate shown, but don't have much Zeiss equipment. However, since you have the aperture, just measuring it and then inquiring of the seller would surely get (or rule out) a match? FWIW, I've had some luck machining U-channels to fit smaller components into larg...
by PeteM
Thu Mar 26, 2020 11:44 pm
Forum: Microscopes and optics
Topic: Olympus Ach 100x/1.25 Oil iris
Replies: 4
Views: 109

Re: Olympus Ach 100x/1.25 Oil iris

If it's marked with the infinity symbol, an Olympus objective should be either UIS or UIS2 (very similar). I'd wonder if your 100x achro is scrupulously clean? In the center it should be as sharp as the Olympus Plan Achro. The latter will be in focus for a wider field of view and preferred for takin...
by PeteM
Thu Mar 26, 2020 7:07 pm
Forum: Microscopes and optics
Topic: Seeking selection advice for stereo microscope
Replies: 22
Views: 286

Re: Seeking selection advice for stereo microscope

. . . I don't have any practical experience with stereo microscopes so no reliable feel for what is needed; I base the requirements on the papers I've read. It's certainly possible that 60x or 40x could work, I don't know. My compound microscope will do 40x and I think that would be at the very edg...
by PeteM
Thu Mar 26, 2020 5:05 am
Forum: Microscopes and optics
Topic: Seeking selection advice for stereo microscope
Replies: 22
Views: 286

Re: Seeking selection advice for stereo microscope

Be sure to check the working distance, to be sure you still have plenty of room for dissecting. General rule is that the higher the magnification (and the cheaper the stereo scope) the less the working distance. Do you know from previous experience what high magnification you'll want? New users are ...
by PeteM
Thu Mar 26, 2020 2:23 am
Forum: Microscopes and optics
Topic: 40x SPlan woes
Replies: 13
Views: 296

Re: 40x SPlan woes

Three things to try: 1) Have you thoroughly cleaned the front element of the 40x SPlan and inspected it under magnification? It will take a small cotton swab and a proper lens cleaner. Could be the objective has a lifetime of junk on it; commonly some immersion oil. 2) Did you adjust the Kohler illu...
by PeteM
Wed Mar 25, 2020 5:33 am
Forum: Miscellaneous
Topic: 1962 ad, perhaps of interest
Replies: 6
Views: 98

1962 ad, perhaps of interest

This caught my eye: https://www.ebay.com/itm/1962-AH-ROBINS-Pharmaceutical-Research-Microscope-Intern-Doctor-Physician-Ad/153876206714?hash=item23d3bc947a%3Ag%3AmlYAAOSwq2heesj-&LH_ItemCondition=1500%7C2000%7C2500%7C3000%7C7000 A staged photo at the time, as pretty much anything seems to be with a m...
by PeteM
Tue Mar 24, 2020 3:34 am
Forum: Pictures and Videos
Topic: First time photos and stacking
Replies: 6
Views: 167

Re: First time photos and stacking

Well done.
by PeteM
Sun Mar 22, 2020 10:56 pm
Forum: Pictures and Videos
Topic: Worth buying?
Replies: 3
Views: 160

Re: Worth buying?

Not unless you already have a Nikon CFI Ph3 phase contrast objective (60x, 100x etc.) and no phase condenser. If you want phase contrast, which will be $$$ for a Nikon E400, you might want a Zernicke type turret phase condenser with several annuli. One of those (with Ph1, Ph2, and Ph3 annuli) would ...
by PeteM
Sun Mar 22, 2020 5:49 pm
Forum: Camera systems and imaging
Topic: Olympus BHS vs modern microscope
Replies: 8
Views: 341

Re: Olympus BHS vs modern microscope

I have an Olympus BHS with various finite turrets, that can also (with a change of heads and objectives) use BX type (UIS) objectives. One reason for this setup was to try different objectives, so I could advise parents and mentors on what to get. I can also put Nikon, Leitz etc. objectives on the B...
by PeteM
Sun Mar 22, 2020 5:40 pm
Forum: Microscopy accessories
Topic: Question about No Cover Glass Objectives
Replies: 2
Views: 103

Re: Question about No Cover Glass Objectives

The higher the magnification, the less depth of field. So, the specimen needs to be in a flat plane, sometimes flat and within something like .10 mm from the objective. Cover slip offers at least two advantages. First, a specimen can essentially be flattened or even attached on the underside of a co...
by PeteM
Sun Mar 22, 2020 6:29 am
Forum: For forum members who want to buy and sell equipment
Topic: Wanted: AO Cat. #1022 20x objective
Replies: 4
Views: 177

Re: Wanted: AO Cat. #1022 20x objective

There's one on Ebay now for $89. Looks to be in good condition.
by PeteM
Sat Mar 21, 2020 11:03 pm
Forum: Microscopes and optics
Topic: Polyvar Dic system questions.
Replies: 7
Views: 248

Re: Polyvar Dic system questions.

I have one of the missing pieces, as shown in post #2, FWIW.
by PeteM
Fri Mar 20, 2020 7:00 pm
Forum: Beginner's corner
Topic: Best quality available for low budget
Replies: 4
Views: 309

Re: Best quality available for low budget

Depends a bit on where you are located. In the US, maybe Europe, $300 you might get a Reichert Microstar IV (410) with a trinocular head and plan achro objectives. With dollars to Euros, if lucky you might find one with phase contrast. Leitz finite scopes might also be a relative bargain. Nikon make...
by PeteM
Fri Mar 20, 2020 4:49 am
Forum: Home-made microscope adaptations
Topic: Homemade phase annuli
Replies: 7
Views: 315

Re: Homemade phase annuli

Glad that worked out.

There is also an Ebay seller who makes and sells a wide variety of phase contrast annuli to fit various condensers; laser cut from Delrin (I believe). Many "makers" and "maker-spaces" will have the cheap 2D CAD and simple laser cutters needed.
by PeteM
Mon Mar 16, 2020 3:55 pm
Forum: Miscellaneous
Topic: Microscopy in times of corona virus crisis
Replies: 5
Views: 1359

Re: Microscopy in times of corona virus crisis

Hi Bob. I'd be delighted if you could start a "fibers" thread here. The only things we've done with our "Micronauts" - and I'm sure you already know about these: - Down insulation vs. polyester (sleeping bags, jackets etc.). Immediately obvious micro-wise why down is better. - Lint from a dryer with...
by PeteM
Sat Mar 14, 2020 5:58 pm
Forum: Beginner's corner
Topic: Scoping out the microscopy world
Replies: 9
Views: 2034

Re: Scoping out the microscopy world

(...) . . . Is the darkfield oil condenser ("DCW") still the best option for BH2 darkfield? And while we're on the subject of condensers, is there any point to the "AAC" condenser? You can use simple darkfield stops inserted below the condenser up to 20x, maybe 40x. 40x and above objectives you'll ...
by PeteM
Sat Mar 14, 2020 5:53 pm
Forum: Pictures and Videos
Topic: Synthetic sapphire
Replies: 12
Views: 2351

Re: Synthetic sapphire

Great image - thanks. Add me to the chorus of those curious to learn more.
by PeteM
Fri Mar 13, 2020 9:00 pm
Forum: Beginner's corner
Topic: Scoping out the microscopy world
Replies: 9
Views: 2034

Re: Scoping out the microscopy world

Most any transmitted light DIC system will range from expensive to very expensive, used or new. One would be lucky to find a good used DIC system, complete, for under $3000. Exceptions might be PZO (older objective designs) and maybe Zeiss (older designs, some risk of delamination). A set Nikon pris...
by PeteM
Fri Mar 13, 2020 6:15 pm
Forum: Microscopes and optics
Topic: Did Leica B.V. Holding Group sell off designs?
Replies: 6
Views: 1513

Re: Did Leica B.V. Holding Group sell off designs?

Hard to know. The Chinese have copied other Japanese designs -- and it has been my impression (as yours) that the Chinese copied Japanese Olympus optical designs. Mainly because some Ebay sellers seem to sell them as compatible and the 180mm ref. tube length works out magnification-wise. On the othe...
by PeteM
Fri Mar 13, 2020 5:04 am
Forum: Microscopes and optics
Topic: Quality?
Replies: 3
Views: 1878

Re: Quality?

I think they're decent, based on experience with biological versions (similar Laborlux D,S,11, and 12). Generally well built and in the same discussion as Olympus BH2, Nikon Labophot, and Zeiss Standard. If it's a complete Pol scope then the somewhat greater difficulty sourcing parts (at least in th...
by PeteM
Thu Mar 12, 2020 3:42 pm
Forum: For forum members who want to buy and sell equipment
Topic: Looking to buy Olympus BH2/BHS
Replies: 3
Views: 1816

Re: Looking to buy Olympus BH2/BHS

Check your messages. Our local MIcronaut program has half a dozen Olympus models (BH2, BHTU, BHT, BHS, even a BX), four with trinocular heads. Prices are only a bit better than Ebay, but proceeds go to the Children's Museum.
by PeteM
Mon Mar 09, 2020 4:34 am
Forum: Beginner's corner
Topic: Discovery of Microorganisms + Advice on Research Microscope
Replies: 33
Views: 8873

Re: Discovery of Microorganisms + Advice on Research Microscope

An Olympus BH2/BHS series or Nikon Labophot or Optiphot would be good choices. Both Olympus and Nikon were sold in such large quantities that upgrades (used and somewhat affordable) will be available. I'm sure someone else will chime in for Zeiss - I'd just put it a tiny step behind. However if you ...
by PeteM
Sun Mar 08, 2020 11:34 pm
Forum: Microscopes and optics
Topic: Cute little AO scope
Replies: 7
Views: 2474

Re: Cute little AO scope

Yes - the Leica is the direct descendent. Early "Leica" dual bridges differed mainly in the paint job and logo.