Search found 2982 matches
- Sun Feb 11, 2024 1:37 am
- Forum: Microscopes and optics
- Topic: Fisher Scientific Micromaster Microscopes
- Replies: 9
- Views: 840
Re: Fisher Scientific Micromaster Microscopes
I thought the Japanese-made scopes were a little bit better. Not sure when manufacturing switched to China - probably over a decade ago? It could also be that some later versions added a field aperture.
- Sun Feb 11, 2024 1:35 am
- Forum: Beginner's corner
- Topic: Micronauts…could someone discuss this?
- Replies: 3
- Views: 511
Re: Micronauts…could someone discuss this?
Not much to discuss. It's a local kids' science program I founded a few years ago.
- Sat Feb 10, 2024 9:36 pm
- Forum: Microscopes and optics
- Topic: Fisher Scientific Micromaster Microscopes
- Replies: 9
- Views: 840
Re: Fisher Scientific Micromaster Microscopes
I've fixed up a handful of them for "Micronauts" -- mostly the earlier Japanese-made models rather than the later Chinese ones. Decent scopes, somewhat like an Olympus BH2 in size and aspirations, but falling short in a few ways. The mechanical design is fiddly, with things like stages and condenser...
- Sat Feb 10, 2024 4:38 am
- Forum: Illumination Techniques
- Topic: My problem with DIC PZO
- Replies: 14
- Views: 1371
Re: My problem with DIC PZO
Ideally, you end up with the upper prisms at the back focal plane of whatever objectives you find. In addition to Stephen's point about objective compatibility, you may want to be mindful that your adaptation of the PZO upper DIC prisms ends up at the same height above the objective as on a PZO syst...
- Fri Feb 09, 2024 9:58 pm
- Forum: My microscope
- Topic: Does Anybody Recognize this Inverted 'Scope?
- Replies: 33
- Views: 3427
Re: Does Anybody Recognize this Inverted 'Scope?
Is there a chart that lists various manufacture’s ring sizes? If so please list the link to it. Thanks Not that I'm aware of. There's an eBay seller making laser-cut rings out of Delrin to fit various phase setups. He lists the dimensions of his sets. In my limited experience, they are often right ...
- Fri Feb 09, 2024 3:23 am
- Forum: My microscope
- Topic: Does Anybody Recognize this Inverted 'Scope?
- Replies: 33
- Views: 3427
Re: Does Anybody Recognize this Inverted 'Scope?
Gerry, It looks pretty straightforward and of decent construction. I'm not sure a Chinglish manual will add much to your understanding. The exception to that would be if the objectives are phase contrast and the condenser annulli are missing -- and you hope to find something that matches. If so, you...
- Wed Feb 07, 2024 9:03 pm
- Forum: Pictures and Videos
- Topic: Nature's Poor Quality Control Standard
- Replies: 3
- Views: 317
Re: Nature's Poor Quality Control Standard
Sloppy workmanship? Perhaps yes and no, Don. One can look at US partisanship and poor decision-making to decide that we humans may not pass even One Sigma quality standards, much less the Six Sigma manufacturing often strives for. However, as a matter of structural design, nature has evolved clever ...
- Tue Feb 06, 2024 9:52 pm
- Forum: For forum members who want to buy and sell equipment
- Topic: WTB: Olympus BH2-AN Analyser for DIC
- Replies: 21
- Views: 1778
Re: WTB: Olympus BH2-AN Analyser for DIC
A few added points: 1) As noted above, the "long barrel" version of the Olympus Vanox upper prism will work on BH2. If you have the upper prism slider but not the intermediate piece it slides into, I believe a polarizing intermediate can work. 2) If you have the long barrel Vanox version of the DIC ...
- Tue Feb 06, 2024 2:30 am
- Forum: Pictures and Videos
- Topic: Crystallization in polarized light
- Replies: 5
- Views: 422
Re: Crystallization in polarized light
Beautifully done (including some of your other videos as well) - and nicely paired with music.
- Mon Feb 05, 2024 2:08 am
- Forum: Microscopy accessories
- Topic: Olympus BH2 Magnification Changer
- Replies: 4
- Views: 647
Re: Olympus BH2 Magnification Changer
There's a sort of carousel inside, typically with achromat doublet lenses for the magnification and often a Bertrand lens. Not sure Olympus made one with something below a 1x magnification. These made great sense in an era where film cameras ruled, and where users want to get the best possible image...
- Sat Feb 03, 2024 3:58 am
- Forum: Illumination Techniques
- Topic: Has anyone ever used LWD condenser?
- Replies: 8
- Views: 944
Re: Has anyone ever used LWD condenser?
. . . About phase contrast, I have a question: given the light only goes through a small hold in the phase contrast ring, does it mean the actual phase contrast objective N.A. is lower? My phase contrast objective is 40x/0.75, I see Olympus ph objective is also 40/0.75. With LWD condenser NA 0.65, ...
- Fri Feb 02, 2024 7:59 pm
- Forum: Illumination Techniques
- Topic: Has anyone ever used LWD condenser?
- Replies: 8
- Views: 944
Re: Has anyone ever used LWD condenser?
As you and Phill suggest, on an inverted microscope you'd want more working distance between the top (bottom side when inverted) of the condenser and the stage - in order to fit Petri dishes and the like. For your Motic version -- lower numerical aperture condensers on an upright microscope often fi...
- Fri Feb 02, 2024 4:02 am
- Forum: Microscopes and optics
- Topic: Measuring collimation error on Olympus CH2
- Replies: 2
- Views: 323
Re: Measuring collimation error on Olympus CH2
For practical purposes, binocular collimation of heads is in the eyes of the beholder. If you can view specimens for long periods of time without eyestrain, I'd say you're OK. Close is often good enough, though some individuals seem more sensitive than others. As far as methods, there are fancy opti...
- Fri Feb 02, 2024 1:14 am
- Forum: Microscopes and optics
- Topic: Olympus CK2 binocular schematic needed
- Replies: 6
- Views: 459
Re: Olympus CK2 binocular schematic needed
Have you tried opening up the interpupillary adjustment all the way - to reveal screws from the back side securing the covers? That, along with removing some other small screws from the front and the middle cover, works for some Olympus heads. The sliders are typically secured by gibs with screws ac...
- Fri Feb 02, 2024 1:00 am
- Forum: Microscopes and optics
- Topic: Olympus CK2 binocular schematic needed
- Replies: 6
- Views: 459
Re: Olympus CK2 binocular schematic needed
Assuming there isn't a detached prism inside and the collimation errors are minor, you can often adjust the eyetubes to get the same view in both eyes. The general procedure, which I think (if memory serves) applies to the CH, BH, and CK2 heads, is to remove the black plastic cosmetic covers to reve...
- Thu Feb 01, 2024 10:14 pm
- Forum: For forum members who want to buy and sell equipment
- Topic: WTB: Olympus BH2-AN Analyser for DIC
- Replies: 21
- Views: 1778
Re: WTB: Olympus BH2-AN Analyser for DIC
Andrei, I believe the BH2-AN is just for the analyzer (a polarizing filter in a slider) and that the BH2-NA is the part you want. In any case, be sure the slider has both a Nomarski prism and an analyzer. If you can find a clone from a Chinese source, that may be your best option. DeBult - we're bot...
- Thu Feb 01, 2024 4:55 am
- Forum: Beginner's corner
- Topic: Importing Items From Europe to US
- Replies: 12
- Views: 1107
Re: Importing Items From Europe to US
I can't speak for all countries, but my experience with small microscope accessories bought on eBay and shipped from Australia, Japan, China, the UK, Germany etc. typically just required paying my prevailing sales tax rate. I've never been asked for a Social Security number. I also wouldn't buy from...
- Thu Feb 01, 2024 12:11 am
- Forum: Microscopes and optics
- Topic: Nikon Plan Apo 20x
- Replies: 2
- Views: 399
Re: Nikon Plan Apo 20x
Yours should have a spring action. It can be stuck from being dropped and the shell slightly deformed, corrosion, immersion oil dried, or attempts to lube it followed by oxidized oil. I believe there are past posts on how to unstick it. The good news, for now, is that yours appears to be stuck in th...
- Tue Jan 30, 2024 1:56 am
- Forum: Beginner's corner
- Topic: What is "fine focus range"
- Replies: 4
- Views: 470
Re: What is "fine focus range"
FWIW, you could think of focusing range from the parfocal tip of the objective down, as well, since the stage is most commonly the part that moves up and down in today's compound scopes. Many scopes have an adjustable stage stop to avoid crashing a slide into the objective when it's being raised - a...
- Mon Jan 29, 2024 10:54 pm
- Forum: Beginner's corner
- Topic: What is "fine focus range"
- Replies: 4
- Views: 470
Re: What is "fine focus range"
I'm not sure I'd trust today's low-end makers to use the term "fine focus range" in the way it was once understood. Those ranges (25mm or 30mm) sound like coarse focusing ranges. It may also be the fine focusing range, depending on the mechanism. That is, how much room there is from focusing from th...
- Mon Jan 29, 2024 5:34 pm
- Forum: Microscopes and optics
- Topic: Which 40x and 4x objectives for Nikon Labophot?
- Replies: 16
- Views: 1194
Re: Which 40x and 4x objectives for Nikon Labophot?
My guesstimate is that the three likeliest problems are: 1) Inability to get both good Kohler illumination and a wide enough image circle. One would expect color fringing at the very edges of the illuminated field, but with that mostly outside the field of view with a proper illumination system, the...
- Mon Jan 29, 2024 2:29 am
- Forum: Microscopes and optics
- Topic: Which 40x and 4x objectives for Nikon Labophot?
- Replies: 16
- Views: 1194
Re: Which 40x and 4x objectives for Nikon Labophot?
Was it a DIY or commercial LED retrofit? I've had good luck with Saul's units and also the RetroDiode.
- Sun Jan 28, 2024 4:31 pm
- Forum: Microscopes and optics
- Topic: Which 40x and 4x objectives for Nikon Labophot?
- Replies: 16
- Views: 1194
Re: Which 40x and 4x objectives for Nikon Labophot?
Two of your problems may have more to do with your condenser than the objectives. 1) The 4x objectives, and particularly the 4x CFN .13 n.a. should easily fill a 20mm FN IF you have a suitable condenser - such as the Nikon flip top unit, with the top down. You can also try dropping your condenser if...
- Sat Jan 27, 2024 5:52 pm
- Forum: Microscopes and optics
- Topic: Yet another Japanese microscope company.
- Replies: 4
- Views: 440
Re: Yet another Japanese microscope company.
Their distributor's websites in Thailand and Vietnam:
https://www.shodensha.co.th/en/
https://www.shodensha.com.vn/en/company/
I'd be curious to know if Shodensa makes its own line of Japanese stereo microscopes or if the OEM business is mostly vision systems?
https://www.shodensha.co.th/en/
https://www.shodensha.com.vn/en/company/
I'd be curious to know if Shodensa makes its own line of Japanese stereo microscopes or if the OEM business is mostly vision systems?
- Fri Jan 26, 2024 2:34 am
- Forum: My microscope
- Topic: как устроен механический тубус ortholux2 как можно перевести на бесконечную оптику,
- Replies: 5
- Views: 896
Re: как устроен механический тубус ortholux2 как можно перевести на бесконечную оптику,
It's possible, but as suggested above, probably not worth the additional cost and effort. What you would need to do is purchase a set of infinity objectives, purchase a compatible infinity head and eyepieces, and then make a dovetail adapter so the new infinity head and its tube less fit your existi...
- Wed Jan 24, 2024 7:19 pm
- Forum: Microscopes and optics
- Topic: NIKON PlanApo 100X/140 oil that is a PlanApo 60X/140 oil
- Replies: 121
- Views: 8311
Re: NIKON PlanApo 100X/140 oil that is a PlanApo 60X/140 oil
Stjepo, FWIW, the white dot in your photo, if repeated three times around the barrel, is likely the elastomer mentioned earlier. Digging that out may help free the entire front lens assembly. At this point, rescuing this objective is a testament to your patience and ingenuity. Don Quixote would be i...
- Tue Jan 23, 2024 3:37 pm
- Forum: Microscopes and optics
- Topic: NIKON PlanApo 100X/140 oil that is a PlanApo 60X/140 oil
- Replies: 121
- Views: 8311
Re: NIKON PlanApo 100X/140 oil that is a PlanApo 60X/140 oil
I am your man . . . Hope you let us know if it manages to improve things. Civilization is made with courageous pioneers like you :-) - both what works and what doesn't. Two thoughts, probably both of which you know. First, make sure the objective barrel is suspended in the cleaner, rather than rest...
- Tue Jan 23, 2024 2:55 am
- Forum: Microscopy accessories
- Topic: American Optical reflected DIC info?
- Replies: 6
- Views: 772
Re: American Optical reflected DIC info?
Stephen, were all or most of his images taken with the AO setup? If so, glad to see them put to such amazing use.
- Tue Jan 23, 2024 2:49 am
- Forum: Beginner's corner
- Topic: How do you clean the surface of objective
- Replies: 8
- Views: 1008
Re: How do you clean the surface of objective
If you happen to have access to a lathe, another option is to mount the objective in an RMS extension, hold that extension in a collet (or chuck if you're super careful and have a long RMS extension), and then use very fine (600 grit or so) silicon carbide paper. It's easily controllable, quick, and...
- Mon Jan 22, 2024 11:37 pm
- Forum: Microscopes and optics
- Topic: DIC for birefringent objects
- Replies: 9
- Views: 829
Re: DIC for birefringent objects
Hi Tim, You'd probably be disappointed with the resolution of HMC at 100x -- and in any case, those objectives seem to be rare on the used market. It's typically used on inverted scopes, up to 40x objectives. The company did make some at 100x, though. It sounds like you're on to something with getti...